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Articles 721 - 750 of 1524
Full-Text Articles in Physical Sciences and Mathematics
High-Performance Multifunctional Graphene-Plga Fibers: Toward Biomimetic And Conducting 3d Scaffolds, Dorna Esrafilzadeh, Rouhollah Jalili, Elise M. Stewart, Seyed Hamed Aboutalebi, Joselito M. Razal, Simon E. Moulton, Gordon G. Wallace
High-Performance Multifunctional Graphene-Plga Fibers: Toward Biomimetic And Conducting 3d Scaffolds, Dorna Esrafilzadeh, Rouhollah Jalili, Elise M. Stewart, Seyed Hamed Aboutalebi, Joselito M. Razal, Simon E. Moulton, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
The development of electrically conducting fibers based on known cytocompatible materials is of interest to those engaged in tissue regeneration using electrical stimulation. Herein, it is demonstrated that with the aid of rheological insights, optimized formulations of graphene containing spinnable poly(lactic-co-glycolic acid) (PLGA) dopes can be made possible. This helps extend the general understanding of the mechanics involved in order to deliberately translate the intrinsic superior electrical and mechanical properties of solution-processed graphene into the design process and practical fiber architectural engineering. The as-produced fibers are found to exhibit excellent electrical conductivity and electrochemical performance, good mechanical properties, and cellular …
Magnetic Field Actuated Manipulation And Transfer Of Oil Droplets On A Stable Underwater Superoleophobic Surface, Haifeng Feng, Xun Xu, Weichang Hao, Yi Du, Dongliang Tian, Lei Jiang
Magnetic Field Actuated Manipulation And Transfer Of Oil Droplets On A Stable Underwater Superoleophobic Surface, Haifeng Feng, Xun Xu, Weichang Hao, Yi Du, Dongliang Tian, Lei Jiang
Australian Institute for Innovative Materials - Papers
The transport of fluids at functional interfaces, driven by the external stimuli, is well established. The lossless transport of oil-based fluids under water remains a challenge, however, due to their high stickiness towards the surface. Here, a superhydrophilic and underwater superoleophobic tri-phase water/oil/solid nanoarray surface has been designed and prepared. The unique tri-phase surface exhibits underwater superoleophobic properties with an extremely low stickiness towards oil-based fluids. The magnetic-field-driven manipulation and transport of oil-based magnetic fluids are demonstrated under water, which opens up a new pathway to design flexible and smart devices for the control and transfer of liquid droplets by …
Moo2/Mo2c/C Spheres As Anode Materials For Lithium Ion Batteries, Mohammad Ihsan, Hongqiang Wang, Siti R. Majid, Jianping Yang, Shane J. Kennedy, Zaiping Guo, Hua-Kun Liu
Moo2/Mo2c/C Spheres As Anode Materials For Lithium Ion Batteries, Mohammad Ihsan, Hongqiang Wang, Siti R. Majid, Jianping Yang, Shane J. Kennedy, Zaiping Guo, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
MoO2/Mo2C/C spheres have been synthesized through hydrothermal and calcination processes. MoO2 is well known for its high theoretical capacity of 838 mAh g-1, but undergoes capacity fading during Li+ insertion/extraction processes. Mo2C has high specific conductance (1.02 x 102 S cm-1) that can provide better electronic conductivity. Carbon is popular for its ability to accommodate the volume variation during charge/discharge. By taking advantage of the combination of Mo2C and C, these MoO2/Mo2C/C spheres demonstrate not only high cycling performance, but also good rate capability when they are used as anode materials for lithium ion batteries. After 100 cycles at 100 …
Point Defects In Epitaxial Silicene On Ag(111) Surfaces, Hongsheng Liu, Haifeng Feng, Yi Du, Jian Chen, Ke-Hui Wu, Jijun Zhao
Point Defects In Epitaxial Silicene On Ag(111) Surfaces, Hongsheng Liu, Haifeng Feng, Yi Du, Jian Chen, Ke-Hui Wu, Jijun Zhao
Australian Institute for Innovative Materials - Papers
Silicene, a counterpart of graphene, has achieved rapid development due to its exotic electronic properties and excellent compatibility with the mature silicon-based semiconductor technology. Its low room-temperature mobility of ~100 cm2 V−1 s−1, however, inhibits device applications such as in field-effect transistors. Generally, defects and grain boundaries would act as scattering centers and thus reduce the carrier mobility. In this paper, the morphologies of various point defects in epitaxial silicene on Ag(111) surfaces have been systematically investigated using first-principles calculations combined with experimental scanning tunneling microscope (STM) observations. The STM signatures for various defects in epitaxial silicene on Ag(111) surface …
A Ferroelectric Photocatalyst Ag10si4o13 With Visible-Light Photooxidation Properties, Amar Al-Keisy, Long Ren, Dandan Cui, Zhongfei Xu, Xun Xu, Xiangdong Su, Weichang Hao, S X. Dou, Yi Du
A Ferroelectric Photocatalyst Ag10si4o13 With Visible-Light Photooxidation Properties, Amar Al-Keisy, Long Ren, Dandan Cui, Zhongfei Xu, Xun Xu, Xiangdong Su, Weichang Hao, S X. Dou, Yi Du
Australian Institute for Innovative Materials - Papers
Ferroelectric p-block semiconductors are regarded as a new family of visible-light photocatalysts because of their dispersive and anisotropic band structures, as well as their intrinsic internal electric field. Silver silicates belong to this family and have band structures and an internal electric field that can be engineered by modulating the stoichiometry of Ag and SiO4. Here, we have developed a new ferroelectric p-block photocatalyst, Ag10Si4O13, by materials design and band engineering, which exhibits excellent photocatalytic activity towards the degradation of organic compounds, which is driven by visible light. Owing to the unique d10 and sp/p configurations in its electronic structure, …
The Effect Of Treatment Time On The Ionic Liquid Surface Film Formation: Promising Surface Coating For Mg Alloy Az31, Yafei Zhang, Xiao Liu, Sina S. Jamali, Bruce Prof Bruce Hinton, Simon E. Moulton, Gordon G. Wallace, Maria Forsyth
The Effect Of Treatment Time On The Ionic Liquid Surface Film Formation: Promising Surface Coating For Mg Alloy Az31, Yafei Zhang, Xiao Liu, Sina S. Jamali, Bruce Prof Bruce Hinton, Simon E. Moulton, Gordon G. Wallace, Maria Forsyth
Australian Institute for Innovative Materials - Papers
Mg alloys are attractive materials for medical devices. The main limitation is that they are prone to corrosion. A low toxicity surface coating that enables uniform, controlled corrosion at a desired rate (this usually means it must offer barrier functions for a limited time period) is desirable. Phosphate-based ionic liquids (ILs) are known to induce a coating that can reduce the corrosion rate of Mg alloys, Furthermore, some ILs are known to be biocompatible and therefore, controlling the corrosion behaviour of an Mg alloy and its surface biocompatibility can be achieved through adding an appropriate low toxic IL surface layer …
Heteroaromatic Organic Compound With Conjugated Multi-Carbonyl As Cathode Material For Rechargeable Lithium Batteries, Meixiang Lv, Fen Zhang, Yiwen Wu, Mujuan Chen, Chunfeng Yao, Junmin Nan, D Shu, Ronghua Zeng, Heping Zeng, Shulei Chou
Heteroaromatic Organic Compound With Conjugated Multi-Carbonyl As Cathode Material For Rechargeable Lithium Batteries, Meixiang Lv, Fen Zhang, Yiwen Wu, Mujuan Chen, Chunfeng Yao, Junmin Nan, D Shu, Ronghua Zeng, Heping Zeng, Shulei Chou
Australian Institute for Innovative Materials - Papers
The heteroaromatic organic compound, N,N'-diphenyl-1,4,5,8-naphthalenetetra-carboxylic diimide (DP-NTCDI-250) as the cathode material of lithium batteries is prepared through a simple one-pot N-acylation reaction of 1,4,5,8-naphthalenetetra-carboxylic dianhydride (NTCDA) with phenylamine (PA) in DMF solution followed by heat treatment in 250 °C. The as prepared sample is characterized by the combination of elemental analysis, NMR, FT-IR, TGA, XRD, SEM and TEM. The electrochemical measurements show that DP-NTCDI-250 can deliver an initial discharge capacity of 170 mAh g-1 at the current density of 25 mA g-1. The capacity of 119 mAh g-1 can be retained after 100 cycles. Even at the high current density …
The Smallest Quaternary Ammonium Salts With Ether Groups For High-Performance Electrochemical Double Layer Capacitors, Taihee Han, Min-Sik Park, Jeonghun Kim, Jung Ho Kim, Ketack Kim
The Smallest Quaternary Ammonium Salts With Ether Groups For High-Performance Electrochemical Double Layer Capacitors, Taihee Han, Min-Sik Park, Jeonghun Kim, Jung Ho Kim, Ketack Kim
Australian Institute for Innovative Materials - Papers
Electrochemical double layer capacitors (EDLCs) are energy storage devices that have been used for a wide range of electronic applications. In particular, the electrolyte is one of the important components, directly related to the capacitance and stability. Herein, we first report a series of the smallest quaternary ammonium salts (QASs), with ether groups on tails and tetrafluoroborate (BF4) as an anion, for use in EDLCs. To find the optimal structure, various QASs with different sized head groups and ether-containing tail groups were systematically compared. Comparing two nearly identical structures with and without ether groups, QASs with oxygen atoms showed improved …
One-Step Synthesis Of A Silicon/Hematite@Carbon Hybrid Nanosheet/Silicon Sandwich-Like Composite As An Anode Material For Li-Ion Batteries, Lei Zhang, Haipeng Guo, Ranjusha Rajagopalan, Xianluo Hu, Yunhui Huang, S X. Dou, Hua-Kun Liu
One-Step Synthesis Of A Silicon/Hematite@Carbon Hybrid Nanosheet/Silicon Sandwich-Like Composite As An Anode Material For Li-Ion Batteries, Lei Zhang, Haipeng Guo, Ranjusha Rajagopalan, Xianluo Hu, Yunhui Huang, S X. Dou, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
Silicon and hematite, both important functional materials with high theoretical capacity, have been intensively investigated separately for application as anode materials in lithium ion batteries (LIBs). The main challenges associated with these anode materials are their low electronic conductivity and structural degradation caused by large volume expansion during cycling, which are not tolerable for future LIBs with high energy density and large power output. Active particles anchored on a porous conductive skeleton are widely used for improving the electrochemical performance of silicon as well as that of hematite. Herein, we develop a novel-structured carbon-silicon-hematite anode material via a single-step technique …
Tuned In Situ Growth Of Nanolayered Rgo On 3d Na3v2(Po4)3 Matrices: A Step Toward Long Lasting, High Power Na-Ion Batteries, Ranjusha Rajagopalan, Lei Zhang, S X. Dou, Hua-Kun Liu
Tuned In Situ Growth Of Nanolayered Rgo On 3d Na3v2(Po4)3 Matrices: A Step Toward Long Lasting, High Power Na-Ion Batteries, Ranjusha Rajagopalan, Lei Zhang, S X. Dou, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
Even though significant improvements have been made in sodium ion batteries, battery management mandates that all batteries in a pack are kept at an acceptable level of more than 80% capacity retention after a long cycle when it is tested for emergencies. Based on these realistic facts, the present study profitably exploits in situ grown reduced graphene oxide on 3D Na3V2 (PO4)3 matrices exhibiting a high rate performance and a specific discharge capacity of 117 mAh g-1. Unlike the earlier literature reports, it is demonstrated that the fabricated electrode shows >85% capacity retention after 6000 cycles at 10 C, the …
Crystallographic Origin Of Cycle Decay Of The High-Voltage Lini0.5Mn1.5O4 Spinel Lithium-Ion Battery Electrode, Wei Kong Pang, Cheng-Zhang Lu, Chia-Erh Liu, Vanessa K. Peterson, Hsiu-Fen Lin, Shih-Chieh Liao, Jinming Chen
Crystallographic Origin Of Cycle Decay Of The High-Voltage Lini0.5Mn1.5O4 Spinel Lithium-Ion Battery Electrode, Wei Kong Pang, Cheng-Zhang Lu, Chia-Erh Liu, Vanessa K. Peterson, Hsiu-Fen Lin, Shih-Chieh Liao, Jinming Chen
Australian Institute for Innovative Materials - Papers
High-voltage spinel LiNi0.5Mn1.5O4 (LNMO) is considered a potential high-power-density positive electrode for lithium-ion batteries, however, it suffers from capacity decay after extended charge-discharge cycling, severely hindering commercial application. Capacity fade is thought to occur through the significant volume change of the LNMO electrode occurring on cycling, and in this work we use operando neutron powder diffraction to compare the structural evolution of the LNMO electrode in an as-assembled 18650-type battery containing a Li4Ti5O12 negative electrode with that in an identical battery following 1000 cycles at high-current. We reveal that the capacity reduction in the battery post cycling is directly proportional …
Effect Of Post-Spinning On The Electrical And Electrochemical Properties Of Wet Spun Graphene Fibre, Javad Foroughi, Dennis Antiohos, Gordon G. Wallace
Effect Of Post-Spinning On The Electrical And Electrochemical Properties Of Wet Spun Graphene Fibre, Javad Foroughi, Dennis Antiohos, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
There is an urgent need for electroactive materials that exhibit high electrochemical performance and mechanically-compliant properties while also retaining high strength and durability. Single graphene sheets have a large electroactive surface area and excellent electrical properties. However, to transfer the excellent mechanical and physical properties of individual graphene to macrostructures for practical application remains a challenge. Herein we demonstrate the effect of carbon nanotubes and/or conducting polymer on electrical and electrochemical properties of graphene fibres. The hybrid graphene/carbon nanotube/poly(3,4-ethylenedioxythiophene) fiber possessed significantly higher electrical conductivity (over 400 S cm-1) compared to a graphene fiber. This value is ≈500% higher than …
Ph-Responsive Fe(Iii)-Gallic Acid Nanoparticles For In Vivo Photoacoustic Imaging-Guided Photothermal Therapy, Jianfeng Zeng, Ming Cheng, Yong Wang, Ling Wen, Ling Chen, Zhen Li, Yongyou Wu, Mingyuan Gao, Zhifang Chai
Ph-Responsive Fe(Iii)-Gallic Acid Nanoparticles For In Vivo Photoacoustic Imaging-Guided Photothermal Therapy, Jianfeng Zeng, Ming Cheng, Yong Wang, Ling Wen, Ling Chen, Zhen Li, Yongyou Wu, Mingyuan Gao, Zhifang Chai
Australian Institute for Innovative Materials - Papers
pH-responsive biocompatible Fe(III)-gallic acid nanoparticles with strong near-infrared absorbance are very stable in mild acidic conditions, but easily decomposed in neutral conditions, which enables the nanoparticles to be stable in a tumor and easily metabolized in other organs, thus providing a safe nanoplatform for in vivo photoacoustic imaging/photothermal therapy theranostic applications.
Fabrication Of A Graphene Coated Nonwoven Textile For Industrial Applications, Dharshika Kongahage, Javad Foroughi, Sanjeev Gambhir, Geoffrey M. Spinks, Gordon G. Wallace
Fabrication Of A Graphene Coated Nonwoven Textile For Industrial Applications, Dharshika Kongahage, Javad Foroughi, Sanjeev Gambhir, Geoffrey M. Spinks, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
A cost effective electrically conductive textile for large scale applications would revolutionise numerous industries. Herein, we demonstrate a novel processing approach to produce conductive textiles for industrial applications. A conductive nonwoven textile was successfully fabricated using a simple dip coating method. The nonwoven polyester was coated with liquid crystallite graphene oxide with subsequent non-toxic chemical reduction. The process is readily scalable. The graphene coated fabric has been characterized by electron microscopy as well as by electrical, mechanical, thermal and abrasion resistance measurements. It was found that the electrical surface resistivity of the prepared polyester-graphene composite fabric was 330 Ω □-1. …
Robust Ferromagnetism Of Single Crystalline Coxzn1−Xo (0.3 ≤ X ≤ 0.45) Epitaxial Films With High Co Concentration, Qiang Cao, Dapeng Zhu, Maxiang Fu, Li Cai, Ping Yang, Shuang Li, Yinlian Zhu, Xiuliang Ma, Guo-Lei Liu, Yan-Xue Chen, Shi-Shen Yan, Liang-Mo Mei, Xiaolin Wang
Robust Ferromagnetism Of Single Crystalline Coxzn1−Xo (0.3 ≤ X ≤ 0.45) Epitaxial Films With High Co Concentration, Qiang Cao, Dapeng Zhu, Maxiang Fu, Li Cai, Ping Yang, Shuang Li, Yinlian Zhu, Xiuliang Ma, Guo-Lei Liu, Yan-Xue Chen, Shi-Shen Yan, Liang-Mo Mei, Xiaolin Wang
Australian Institute for Innovative Materials - Papers
In contrast to conventional dilute magnetic semiconductors with concentrations of magnetic ions of just a few percent, here, we report the fabrication of epitaxial Cox Zn 1− xO single crystalline films with Co concentrations from x = 0.3 up to 0.45 by radio-frequency oxygen-plasma-assisted molecular beam epitaxy. The films retain their single crystalline wurtzite structure without any other crystallographic phase from precipitates, based on reflection high energy electron diffraction, X-ray diffraction, transmission electron microscopy, and Raman scattering. The results of X-ray diffraction, optical transmission spectroscopy, and in-situ X-ray photoelectron spectroscopy confirm the incorporation of Co2+ cations into the wurtzite lattice. …
Mineral-Biochar Composites: Molecular Structure And Porosity, Aditya Rawal, Stephen D. Joseph, James M. Hook, Chee Chia, Paul R. Munroe, Scott Donne, Yun Lin, David Phelan, David R. G Mitchell, Ben Pace, Josip Horvat, J. Beau W. Webber
Mineral-Biochar Composites: Molecular Structure And Porosity, Aditya Rawal, Stephen D. Joseph, James M. Hook, Chee Chia, Paul R. Munroe, Scott Donne, Yun Lin, David Phelan, David R. G Mitchell, Ben Pace, Josip Horvat, J. Beau W. Webber
Australian Institute for Innovative Materials - Papers
Dramatic changes in molecular structure, degradation pathway, and porosity of biochar are observed at pyrolysis temperatures ranging from 250 to 550 °C when bamboo biomass is pretreated by iron-sulfate-clay slurries (iron-clay biochar), as compared to untreated bamboo biochar. Electron microscopy analysis of the biochar reveals the infusion of mineral species into the pores of the biochar and the formation of mineral nanostructures. Quantitative 13C nuclear magnetic resonance (NMR) spectroscopy shows that the presence of the iron clay prevents degradation of the cellulosic fraction at pyrolysis temperatures of 250 °C, whereas at higher temperatures (350-550 °C), the clay promotes biomass degradation, …
General Synthesis Of Xli2mno3·(1 - X)Lini1/3co1/3mn1/3o2 (X = 1/4, 1/3, And 1/2) Hollow Microspheres Towards Enhancing The Performance Of Rechargeable Lithium Ion Batteries, Jingfa Li, Min Li, Lei Zhang, Jiazhao Wang
General Synthesis Of Xli2mno3·(1 - X)Lini1/3co1/3mn1/3o2 (X = 1/4, 1/3, And 1/2) Hollow Microspheres Towards Enhancing The Performance Of Rechargeable Lithium Ion Batteries, Jingfa Li, Min Li, Lei Zhang, Jiazhao Wang
Australian Institute for Innovative Materials - Papers
Well-crystallized and high-performance xLi2MnO3·(1 - x)LiNi1/3Co1/3Mn1/3O2 (x = 1/2, 1/3, 1/4) hollow microspheres are prepared through an in situ self-sacrificial template route. By precisely adjusting y values in the starting precursor, CoyMn3-yO4 porous microspheres, uniform xLi2MnO3·(1 - x)LiNi1/3Co1/3Mn1/3O2 hollow microspheres are formed. Property testing of lithium ion batteries shows that an appropriate x value plays an important role in their electrochemical behavior: a higher x value leads to a higher specific capacity, but a worse cycling capability, and vice versa; when x = 1/3, the xLi2MnO3·(1 - x)LiNi1/3Co1/3Mn1/3O2 electrode shows a high specific capacity and a high capacity retention rate. …
Woven-Yarn Thermoelectric Textiles, Jae Ah Lee, Ali E. Aliev, Julia S. Bykova, Monica Jung De Andrade, Daeyoung Kim, Hyeon Jun Sim, Xavier Lepró, Anvar Zakhidov, Jeongbong Lee, Geoffrey M. Spinks, Siegmar Roth, Seon Jeong Kim, Ray H. Baughman
Woven-Yarn Thermoelectric Textiles, Jae Ah Lee, Ali E. Aliev, Julia S. Bykova, Monica Jung De Andrade, Daeyoung Kim, Hyeon Jun Sim, Xavier Lepró, Anvar Zakhidov, Jeongbong Lee, Geoffrey M. Spinks, Siegmar Roth, Seon Jeong Kim, Ray H. Baughman
Australian Institute for Innovative Materials - Papers
The fabrication and characterization of highly flexible textiles are reported. These textiles can harvest thermal energy from temperature gradients in the desirable through-thickness direction. The tiger yarns containing n- and p-type segments are woven to provide textiles containing n-p junctions. A high power output of up to 8.6 W m−2 is obtained for a temperature difference of 200 °C.
Brazing Techniques For The Fabrication Of Biocompatible Carbon-Based Electronic Devices, Nicholas V. Apollo, Desmond Lau, Arman Ahnood, Alastair Stacey, Kumaravelu Ganesan, Samantha G. Lichter, Kate Fox, Javad Foroughi, Hamish Meffin, Gordon G. Wallace, Ray H. Baughman, Steven Prawer, David J. Garrett
Brazing Techniques For The Fabrication Of Biocompatible Carbon-Based Electronic Devices, Nicholas V. Apollo, Desmond Lau, Arman Ahnood, Alastair Stacey, Kumaravelu Ganesan, Samantha G. Lichter, Kate Fox, Javad Foroughi, Hamish Meffin, Gordon G. Wallace, Ray H. Baughman, Steven Prawer, David J. Garrett
Australian Institute for Innovative Materials - Papers
Prototype electronic devices have been critical to the discovery and demonstration of the unique properties of new materials, including composites based on carbon nanotubes (CNT) and graphene. However, these devices are not typically constructed with durability or biocompatibility in mind, relying on conductive polymeric adhesives, mechanical clamps or crimps, or solders for electrical connections. In this paper, two key metallization techniques are presented that employ commercially-available brazing alloys to fabricate electronic devices based on diamond and carbonaceous wires. Investigation of the carbon - alloy interfacial interactions was utilized to guide device fabrication. The interplay of both chemical ("adhesive") and mechanical …
Boric Acid Assisted Reduction Of Graphene Oxide: A Promising Material For Sodium Ion Batteries, Ying Wang, Caiyun Wang, Yijing Wang, Hua-Kun Liu, Zhenguo Huang
Boric Acid Assisted Reduction Of Graphene Oxide: A Promising Material For Sodium Ion Batteries, Ying Wang, Caiyun Wang, Yijing Wang, Hua-Kun Liu, Zhenguo Huang
Australian Institute for Innovative Materials - Papers
Reduced graphene oxide, an intensively investigated material for Li-ion batteries, has shown mostly unsatisfactory performance in Na-ion batteries, since its d-spacing is believed to be too small for effective insertion/deinsertion of Na+ ions. Herein, a facile method was developed to produce boron-functionalized reduced graphene oxide (BF-rGO), with an enlarged interlayer spacing and defect-rich structure, which effectively accommodates the sodiation/desodiation and provides more active sites. The Na/BF-rGO half cells exhibit unprecedented long cycling stability, with ∼89.4% capacity retained after 5000 cycles (0.002% capacity decay per cycle) at 1000 mA·g-1 current density. High specific capacity (280 mAh·g-1) and great rate capability were …
Strong Affinity Of Polysulfide Intermediates To Multi-Functional Binder For Practical Application In Lithium-Sulfur Batteries, Hongqiang Wang, Vitor Sencadas, Guoping Gao, Hong Gao, Aijun Du, Hua-Kun Liu, Zaiping Guo
Strong Affinity Of Polysulfide Intermediates To Multi-Functional Binder For Practical Application In Lithium-Sulfur Batteries, Hongqiang Wang, Vitor Sencadas, Guoping Gao, Hong Gao, Aijun Du, Hua-Kun Liu, Zaiping Guo
Australian Institute for Innovative Materials - Papers
Binder, one of the most important battery components, plays a critical role in lithium-sulfur batteries. Poly(vinylidene difluoride) (PVDF), a commonly used binder in lithium-sulfur batteries, does not have a strong affinity to the intermediate polysulfides, however, leading to fast capacity fading with electrochemical cycling. Herein, copolymers of vinylidene difluoride with other monomers are used as multi-functional binders to enhance the electrochemical performance of lithium-sulfur batteries. Compared to the PVDF, the copolymer, poly(vinylidene difluoride-trifluoroethylene) (P(VDF-TRFE)) binder exhibits higher adhesion strength, less porosity, and stronger chemical interaction with polysulfides, which helps to keep the polysulfides within the cathode region, thereby improving the …
A Free-Standing Graphene-Polypyrrole Hybrid Paper Via Electropolymerization With An Enhanced Areal Capacitance, Kewei Shu, Caiyun Wang, Chen Zhao, Yu Ge, Gordon G. Wallace
A Free-Standing Graphene-Polypyrrole Hybrid Paper Via Electropolymerization With An Enhanced Areal Capacitance, Kewei Shu, Caiyun Wang, Chen Zhao, Yu Ge, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Here we developed a free-standing reduced graphene oxide (rGO)-polypyrrole (PPy) hybrid paper via electropolymerization on a paper-like graphene gel. This flexible hybrid paper displayed a uniform layered structure with PPy coated onto the graphene layers. A high areal mass of 2.7 mg cm−2 could be obtained. It delivered a greatly enhanced areal capacitance of 440 mF cm−2 at 0.5 A g−1, in contrast to that 151∼198.5 mF cm−2 previously reported for graphene paper or polypyrrole-graphene paper. It can retain ∼81% of the initial capacitance at a high current density of 6 A g−1. The combined high flexibility with outstanding electrochemical …
Core-Shell Co/Coo Integrated On 3d Nitrogen Doped Reduced Graphene Oxide Aerogel As An Enhanced Electrocatalyst For The Oxygen Reduction Reaction, Meng Wang, Yuyang Hou, Robert C.T. Slade, Jiazhao Wang, Dongqi Shi, David Wexler, Hua-Kun Liu, Jun Chen
Core-Shell Co/Coo Integrated On 3d Nitrogen Doped Reduced Graphene Oxide Aerogel As An Enhanced Electrocatalyst For The Oxygen Reduction Reaction, Meng Wang, Yuyang Hou, Robert C.T. Slade, Jiazhao Wang, Dongqi Shi, David Wexler, Hua-Kun Liu, Jun Chen
Australian Institute for Innovative Materials - Papers
Here, we demonstrate that Cobalt/cobalt oxide core-shell nanoparticles integrated on nitrogen-doped (N-doped) three-dimensional reduced graphene oxide aerogel-based architecture (Co/CoO-NGA) were synthesized through a facile hydrothermal method followed by annealing treatment. The unique endurable porous structure could provide sufficient mass transfer channels and ample active sites on Co/CoO-NGA to facilitate the catalytic reaction. The synthesized Co/CoO-NGA was explored as an electrocatalyst for the oxygen reduction reaction, showing comparable oxygen reduction performance with excellent methanol resistance and better durability compared with Pt/C.
Critical Thickness Of Phenolic Resin-Based Carbon Interfacial Layer For Improving Long Cycling Stability Of Silicon Nanoparticle Anodes, Wei Luo, Yunxiao Wang, Shulei Chou, Yanfei Xu, Wei Li, Biao Kong, S X. Dou, Hua-Kun Liu, Jianping Yang
Critical Thickness Of Phenolic Resin-Based Carbon Interfacial Layer For Improving Long Cycling Stability Of Silicon Nanoparticle Anodes, Wei Luo, Yunxiao Wang, Shulei Chou, Yanfei Xu, Wei Li, Biao Kong, S X. Dou, Hua-Kun Liu, Jianping Yang
Australian Institute for Innovative Materials - Papers
Silicon has a high theoretical capacity, still limits its application on Si-based anodes due to the problems of low electric conductivity, large volume change, continuous formation of unstable solid electrolyte interphase layer, and easy fracture during lithiation and delithiation process. Despite various carbon coating approaches are developed to fabricate carbon coated silicon core-shell and yolk-shell nanocomposites with improved electrochemical performance, the challenges including poor long-term cyclability, low Si mass ratio, and scalability remains. To overcome these challenges, we design an interfacial microporous carbon coating strategy on silicon nanoparticles to form homogeneous coaxial core-shell nanostructures. This synthesis sol-gel approach is simple, …
In-Plane Graphene/Boron-Nitride Heterostructures As An Efficient Metal-Free Electrocatalyst For The Oxygen Reduction Reaction, Qiao Sun, Caixia Sun, Aijun Du, S X. Dou, Zhen Li
In-Plane Graphene/Boron-Nitride Heterostructures As An Efficient Metal-Free Electrocatalyst For The Oxygen Reduction Reaction, Qiao Sun, Caixia Sun, Aijun Du, S X. Dou, Zhen Li
Australian Institute for Innovative Materials - Papers
Exploiting metal-free catalysts for the oxygen reduction reaction (ORR) and understanding their catalytic mechanisms are vital for the development of fuel cells (FCs). Our study has demonstrated that in-plane heterostructures of graphene and boron nitride (G/BN) can serve as an efficient metal-free catalyst for the ORR, in which the C-N interfaces of G/BN heterostructures act as reactive sites. The formation of water at the heterointerface is both energetically and kinetically favorable via a four-electron pathway. Moreover, the water formed can be easily released from the heterointerface, and the catalytically active sites can be regenerated for the next cycle. Since G/BN …
The Origin Of Capacity Fade In The Li2mno3·Limo2 (M = Li, Ni, Co, Mn) Microsphere Positive Electrode: An Operando Neutron Diffraction And Transmission X-Ray Microscopy Study, Chih Jung Chen, Wei Kong Pang, Tatsuhiro Mori, Vanessa K. Peterson, Neeraj Sharma, Po Han Lee, She-Huang Wu, Chun Chieh Wang, Yen Fang Song, Ru-Shi Liu
The Origin Of Capacity Fade In The Li2mno3·Limo2 (M = Li, Ni, Co, Mn) Microsphere Positive Electrode: An Operando Neutron Diffraction And Transmission X-Ray Microscopy Study, Chih Jung Chen, Wei Kong Pang, Tatsuhiro Mori, Vanessa K. Peterson, Neeraj Sharma, Po Han Lee, She-Huang Wu, Chun Chieh Wang, Yen Fang Song, Ru-Shi Liu
Australian Institute for Innovative Materials - Papers
The mechanism of capacity fade of the Li2MnO3·LiMO2 (M = Li, Ni, Co, Mn) composite positive electrode within a full cell was investigated using a combination of operando neutron powder diffraction and transmission X-ray microscopy methods, enabling the phase, crystallographic, and morphological evolution of the material during electrochemical cycling to be understood. The electrode was shown to initially consist of 73(1) wt % R3m LiMO2 with the remaining 27(1) wt % C2/m Li2MnO3 likely existing as an intergrowth. Cracking in the Li2MnO3·LiMO2 electrode particle under operando microscopy observation was revealed to be initiated by the solid-solution reaction of the LiMO2 …
Self-Monitoring And Self-Correcting Polymer Fibers Coated With Carbon Nanotubes, Zhixin Tai, Yajie Liu, Hua-Kun Liu, S X. Dou
Self-Monitoring And Self-Correcting Polymer Fibers Coated With Carbon Nanotubes, Zhixin Tai, Yajie Liu, Hua-Kun Liu, S X. Dou
Australian Institute for Innovative Materials - Papers
Bandaging, which has been used either to support a medical device such as a dressing or splint, or on its own to provide support to the body or restrict the motion of a part of the body, is further studied in our work in the form of multifunctional materials for self-monitoring and self-correcting by integration with carbon nanotubes (CNTs). Here, modified polymer fibers for bandages can be fabricated from fibers of commercially available bandages with carbon nanotubes uniformly adhering to the fibers, via a simple solution process to produce tough, flexible, and electrically conducting fibers. The conductivity of the coated …
Effects Of Carbon Content On The Electrochemical Performances Of Mos2-C Nanocomposites For Li-Ion Batteries, Weiyi Sun, Zhe Hu, Caiyun Wang, Zhanliang Tao, Shulei Chou, Yong-Mook Kang, Hua-Kun Liu
Effects Of Carbon Content On The Electrochemical Performances Of Mos2-C Nanocomposites For Li-Ion Batteries, Weiyi Sun, Zhe Hu, Caiyun Wang, Zhanliang Tao, Shulei Chou, Yong-Mook Kang, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
Molybdenum disulfide is popular for rechargeable batteries, especially in Li-ion batteries, because of its layered structure and relatively high specific capacity. In this paper, we report MoS2-C nanocomposites that are synthesized by a hydrothermal process, and their use as anode material for Li-ion batteries. Ascorbic acid is used as the carbon source, and the carbon contents can be tuned from 2.5 wt % to 16.2 wt %. With increasing of carbon content, the morphology of MoS2-C nanocomposites changes from nanoflowers to nanospheres, and the particle size is decreased from 200 to 60 nm. This change is caused by the chemical …
Thermoelectric Enhancement Of Different Kinds Of Metal Chalcogenides, Chao Han, Qiao Sun, Zhen Li, S X. Dou
Thermoelectric Enhancement Of Different Kinds Of Metal Chalcogenides, Chao Han, Qiao Sun, Zhen Li, S X. Dou
Australian Institute for Innovative Materials - Papers
Due to the urgency of our energy and environmental issues, a variety of cost-effective and pollution-free technologies have attracted considerable attention, among which thermoelectric technology has made enormous progress. Substantial numbers of new thermoelectric materials are created with high figure of merit (ZT) by using advanced nanoscience and nanotechnology. This is especially true in the case of metal-chalcogenide-based materials, which possess both relatively high ZT and low cost among all the different kinds of thermoelectric materials. Here, comprehensive coverage of recent advances in metal chalcogenides and their correlated thermoelectric enhancement mechanisms are provided. Several new strategies are summarized with the …
Stability Of Chemically Passivated Silicon Electrodes In Aqueous Solutions: Interplay Between Bias Voltage And Hydration Of The Electrolyte, Vinicius R. Goncales, Yanfang Wu, Bakul Gupta, Stephen G. Parker, Ying Yang, Simone Ciampi, Richard D. Tilley, J Justin Gooding
Stability Of Chemically Passivated Silicon Electrodes In Aqueous Solutions: Interplay Between Bias Voltage And Hydration Of The Electrolyte, Vinicius R. Goncales, Yanfang Wu, Bakul Gupta, Stephen G. Parker, Ying Yang, Simone Ciampi, Richard D. Tilley, J Justin Gooding
Australian Institute for Innovative Materials - Papers
Chemical passivation of nonoxide semiconductors is a key prerequisite for electrochemical devices that operate in water-based electrolytes. Silicon remains the technologically most important material and organic monolayers based on the hydrosilylation of 1-alkynes have been shown to be a very effective approach to limit the thermodynamically favorable oxidation of the electrode, while still retaining efficient electron transfer across the solid/liquid interface. A large excess of a supporting electrolyte is always added to the solution in order to confine the applied potential gradient to the region close to the surface of the electrode. However, little is known about how the degree …