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Articles 991 - 1020 of 1524
Full-Text Articles in Physical Sciences and Mathematics
Fishing For Artificial Muscles Nets A Very Simple Solution, Geoffrey M. Spinks
Fishing For Artificial Muscles Nets A Very Simple Solution, Geoffrey M. Spinks
Australian Institute for Innovative Materials - Papers
Sometimes in research the answer is right under your nose. In our case, we spent nearly two decades developing exotic materials as artificial muscles - to now show in a paper published in Science today that the best performing systems can be made from ordinary, everyday fishing line
Microstructural And Crystallographic Imperfections Of Mgb2 Superconducting Wire And Their Correlation With The Critical Current Density, Mohammed Shahabuddin, Nasser S. Alzayed, Sangjun Oh, Seyong Choi, Minoru Maeda, Satoshi Hata, Yusuke Shimada, Md Shahriar Al Hossain, Jung Ho Kim
Microstructural And Crystallographic Imperfections Of Mgb2 Superconducting Wire And Their Correlation With The Critical Current Density, Mohammed Shahabuddin, Nasser S. Alzayed, Sangjun Oh, Seyong Choi, Minoru Maeda, Satoshi Hata, Yusuke Shimada, Md Shahriar Al Hossain, Jung Ho Kim
Australian Institute for Innovative Materials - Papers
A comprehensive study of the effects of structural imperfections in MgB2 superconducting wire has been conducted. As the sintering temperature becomes lower, the structural imperfections of the MgB2 material are increased, as reflected by detailed X-ray refinement and the normal state resistivity. The crystalline imperfections, caused by lattice disorder, directly affect the impurity scattering between the π and σ bands of MgB2, resulting in a larger upper critical field. In addition, low sintering temperature keeps the grain size small, which leads to a strong enhancement of pinning, and thereby, enhanced critical current density. Owing to both the impurity scattering and …
Capacitive Behavior Of Latex/Single-Wall Carbon Nanotube Stretchable Electrodes, Hyeon Taek Jeong, Byung Kim, Robert Gorkin Iii, Michael J. Higgins, Gordon G. Wallace
Capacitive Behavior Of Latex/Single-Wall Carbon Nanotube Stretchable Electrodes, Hyeon Taek Jeong, Byung Kim, Robert Gorkin Iii, Michael J. Higgins, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
In this report single-wall carbon nanotubes (SWNTs) were coated onto latex using spray coating to produce a stretchable electrode. The electrochemical properties of the electrode were determined using cyclic voltammetry and electrochemical impedance spectroscopy and galvanostatic charge/discharge tests were also carried out. The impedance and charge/discharge curves of the latex/SWNTs electrode showed good capacitive behavior even after repetitive stretching to 100% strain. The highest capacitance value obtained for the unstretched SWNTs electrode was 119 F g−1 in 1 M Na2SO4 at 5 mV s−1. After the 100th stretch ≈ 80% of the original capacitance value was retained.
3d Hierarchical Rutile Tio2 And Metal-Free Organic Sensitizer Producing Dye-Sensitized Solar Cells 8.6% Conversion Efficiency, Jianjian Lin, Yoon-Uk Heo, Andrew Nattestad, Ziqi Sun, Lianzhou Wang, Jung Ho Kim, S X. Dou
3d Hierarchical Rutile Tio2 And Metal-Free Organic Sensitizer Producing Dye-Sensitized Solar Cells 8.6% Conversion Efficiency, Jianjian Lin, Yoon-Uk Heo, Andrew Nattestad, Ziqi Sun, Lianzhou Wang, Jung Ho Kim, S X. Dou
Australian Institute for Innovative Materials - Papers
Three-dimensional (3D) hierarchical nanoscale architectures comprised of building blocks, with specifically engineered morphologies, are expected to play important roles in the fabrication of 'next generation' microelectronic and optoelectronic devices due to their high surface-to-volume ratio as well as opto-electronic properties. Herein, a series of well-defined 3D hierarchical rutile TiO2 architectures (HRT) were successfully prepared using a facile hydrothermal method without any surfactant or template, simply by changing the concentration of hydrochloric acid used in the synthesis. The production of these materials provides, to the best of our knowledge, the first identified example of a ledgewise growth mechanism in a rutile …
Mechanically Strong High Performance Layered Polypyrrole Nano Fibre/Graphene Film For Flexible Solid State Supercapacitor, Sha Li, Chen Zhao, Kewei Shu, Caiyun Wang, Zaiping Guo, Gordon G. Wallace, Hua-Kun Liu
Mechanically Strong High Performance Layered Polypyrrole Nano Fibre/Graphene Film For Flexible Solid State Supercapacitor, Sha Li, Chen Zhao, Kewei Shu, Caiyun Wang, Zaiping Guo, Gordon G. Wallace, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
Paper like flexible electrode becomes one of the most important research objects recently in request of the fast expanding market of portable electronics. Flexible solid state supercapacitors are shortlisted as one of the most promising energy devices to power electronics with medium to high power density requirements. In this work, we developed a simple but effective way to produce a mechanically strong and electrochemically active RGO/polypyrrole (PPy) fibre paper. A well-bedded microstructure was created with interlaced polypyrrole fibres evenly distributed between the graphene layers. Such microstructure can create enormous amount of pores and therefore provides larger interfaces for charge carrier …
Electronic Coupling And Catalytic Effect On H2 Evolution Of Mos2/Graphene Nanocatalyst, Ting Liao, Ziqi Sun, Chenghua Sun, S X. Dou, Debra J. Searles
Electronic Coupling And Catalytic Effect On H2 Evolution Of Mos2/Graphene Nanocatalyst, Ting Liao, Ziqi Sun, Chenghua Sun, S X. Dou, Debra J. Searles
Australian Institute for Innovative Materials - Papers
Inorganic nano-graphene hybrid materials that are strongly coupled via chemical bonding usually present superior electrochemical performance. However, how the chemical bond forms and the synergistic catalytic mechanism remain fundamental questions. In this study, the chemical bonding of the MoS 2 nanolayer supported on vacancy mediated graphene and the hydrogen evolution reaction of this nanocatalyst system were investigated. An obvious reduction of the metallic state of the MoS 2 nanolayer is noticed as electrons are transferred to form a strong contact with the reduced graphene support. The missing metallic state associated with the unsaturated atoms at the peripheral sites in turn …
Interplay Between Boron Precursors And Ni-Co-B Nanoparticle Doping In The Fabrication Of Mgb2 Superconductor With Improved Electromagnetic Properties, Mislav Mustapic, Josip Horvat, Zeljko Skoko, Md Shahriar Hossain, S X. Dou
Interplay Between Boron Precursors And Ni-Co-B Nanoparticle Doping In The Fabrication Of Mgb2 Superconductor With Improved Electromagnetic Properties, Mislav Mustapic, Josip Horvat, Zeljko Skoko, Md Shahriar Hossain, S X. Dou
Australian Institute for Innovative Materials - Papers
The influence of different boron precursor powders on the critical current density of MgB2 superconductor with added Ni-Co-B nanoparticles is investigated. Different types of boron have different morphologies, particle sizes and impurity content, all of which have a strong impact on the critical current density (Jc). The boron samples investigated in this study include three different boron powders: semicrystalline boron (denoted as SC), with nanosized particles and high purity (99%) supplied from Specialty Materials, Inc. (USA); amorphous boron (denoted as AB), with nanosized particles and high purity (99%) supplied from Russia; and finally pure crystalline boron (denoted as CB), with …
Facile Synthesis Of Highly Efficient One-Dimensional Plasmonic Photocatalysts Through Ag@Cu2o Core-Shell Heteronanowires, Jinyan Xiong, Zhen Li, Jun Chen, Shanqing Zhang, Lianzhou Wang, S X. Dou
Facile Synthesis Of Highly Efficient One-Dimensional Plasmonic Photocatalysts Through Ag@Cu2o Core-Shell Heteronanowires, Jinyan Xiong, Zhen Li, Jun Chen, Shanqing Zhang, Lianzhou Wang, S X. Dou
Australian Institute for Innovative Materials - Papers
A novel class of one-dimensional (1D) plasmonic Ag@Cu2O core-shell heteronanowires have been synthesized at room temperature for photocatalysis application. The morphology, size, crystal structure and composition of the products were investigated by XRD, SEM, TEM, XPS, and UV-vis instruments. It was found the reaction time and the amount of Ag nanowires play crucial roles in the formation of well-defined 1D Ag@Gu(2)O core-shell heteronanowires. The resultant 1D Ag@Cu2O NWs exhibit much higher photocatalytic activity toward degradation of organic contaminants than Ag@Cu2O core-shell nanopartides or pure Cu2O nanospheres under solar light irradiation. The drastic enhancement in photocatalytic activity could be attributed to …
Sulfur-Graphene Nanostructured Cathodes Via Ball-Milling For High-Performance Lithium-Sulfur Batteries, Jiantie Xu, Jianglan Shui, Jianli Wang, Min Wang, Hua-Kun Liu, S X. Dou, In-Yup Jeon, Jeong-Min Seo, Jong-Beom Baek, Liming Dai
Sulfur-Graphene Nanostructured Cathodes Via Ball-Milling For High-Performance Lithium-Sulfur Batteries, Jiantie Xu, Jianglan Shui, Jianli Wang, Min Wang, Hua-Kun Liu, S X. Dou, In-Yup Jeon, Jeong-Min Seo, Jong-Beom Baek, Liming Dai
Australian Institute for Innovative Materials - Papers
Although much progress has been made to develop high-performance lithium-sulfur batteries (LSBs), the reported physical or chemical routes to sulfur cathode materials are often multistep/complex and even involve environmentally hazardous reagents, and hence are infeasible for mass production. Here, we report a simple ball-milling technique to combine both the physical and chemical routes into a one-step process for low-cost, scalable, and eco-friendly production of graphene nanoplatelets (GnPs) edge-functionalized with sulfur (S-GnPs) as highly efficient LSB cathode materials of practical significance. LSBs based on the S-GnP cathode materials, produced by ball-milling 70 wt % sulfur and 30 wt % graphite, delivered …
Ambient Scalable Synthesis Of Surfactant-Free Thermoelectric Cuagse Nanoparticles With Reversible Metallic-N-P Conductivity Transition, Chao Han, Qiao Sun, Zhenxiang Cheng, Jianli Wang, Zhen Li, Gao Qing (Max) Lu, S X. Dou
Ambient Scalable Synthesis Of Surfactant-Free Thermoelectric Cuagse Nanoparticles With Reversible Metallic-N-P Conductivity Transition, Chao Han, Qiao Sun, Zhenxiang Cheng, Jianli Wang, Zhen Li, Gao Qing (Max) Lu, S X. Dou
Australian Institute for Innovative Materials - Papers
Surfactant-free CuAgSe nanoparticles were successfully synthesized on a large scale within a short reaction time via a simple environmentally friendly aqueous approach under room temperature. The nanopowders obtained were consolidated into pellets for investigation of their thermoelectric properties between 3 and 623 K. The pellets show strong metallic characteristics below 60 K and turn into an n-type semiconductor with increasing temperature, accompanied by changes in the crystal structure (i.e., from the pure tetragonal phase into a mixture of tetragonal and orthorhombic phases), the electrical conductivity, the Seebeck coefficient, and the thermal conductivity, which leads to a figure of merit (ZT) …
One-Step Synthesis Of Graphene/Polypyrrole Nanofiber Composites As Cathode Material For A Biocompatible Zinc/Polymer Battery, Sha Li, Kewei Shu, Chen Zhao, Caiyun Wang, Zaiping Guo, Gordon G. Wallace, Hua-Kun Liu
One-Step Synthesis Of Graphene/Polypyrrole Nanofiber Composites As Cathode Material For A Biocompatible Zinc/Polymer Battery, Sha Li, Kewei Shu, Chen Zhao, Caiyun Wang, Zaiping Guo, Gordon G. Wallace, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
The significance of developing implantable, biocompatible, miniature power sources operated in a low current range has become manifest in recent years to meet the demands of the fast-growing market for biomedical microdevices. In this work, we focus on developing high-performance cathode material for biocompatible zinc/polymer batteries utilizing biofluids as electrolyte. Conductive polymers and graphene are generally considered to be biocompatible and suitable for bioengineering applications. To harness the high electrical conductivity of graphene and the redox capability of polypyrrole (PPy), a polypyrrole fiber/graphene composite has been synthesized via a simple one-step route. This composite is highly conductive (141 S cm …
A Method For Systematic Electrochemical And Electrophysiological Evaluation Of Neural Recording Electrodes, Alexander R. Harris, Simeon J. Morgan, Gordon G. Wallace, Antonio Paolini
A Method For Systematic Electrochemical And Electrophysiological Evaluation Of Neural Recording Electrodes, Alexander R. Harris, Simeon J. Morgan, Gordon G. Wallace, Antonio Paolini
Australian Institute for Innovative Materials - Papers
New materials and designs for neural implants are typically tested separately, with a demonstration of performance but without reference to other implant characteristics. This precludes a rational selection of a particular implant as optimal for a particular application and the development of new materials based on the most critical performance parameters. This article develops a protocol for in vitro and in vivo testing of neural recording electrodes. Recommended parameters for electrochemical and electrophysiological testing are documented with the key steps and potential issues discussed. This method eliminates or reduces the impact of many systematic errors present in simpler in vivo …
Synthesis And Electrochemical Properties Of Wo3/C For Lithium Ion Batteries, Hong Gao, Shuijin S. Yang, Chuanqi Feng, Jiazhao Wang, Zaiping Guo
Synthesis And Electrochemical Properties Of Wo3/C For Lithium Ion Batteries, Hong Gao, Shuijin S. Yang, Chuanqi Feng, Jiazhao Wang, Zaiping Guo
Australian Institute for Innovative Materials - Papers
WO3/C nanorods were prepared by a combination of hydrothermal synthesis method and the solid phase reaction method, using (NH4)10H2(W2O7)6, H2C2O4·2H2O and glucose(carbon source) as raw materials. The effects of different proportions of glucose on the morphologies and electrochemical properties of the final products were systematically investigated. The results showed that the WO3/C nanorods prepared with the 10 wt.% glucose as carbon source exhibited the highest reversible specific capacity (807 mAh g-1) at current density …
Magnetic Properties And Magnetocaloric Effect In Layered Ndmn1.9ti0.1si2, M F. Md Din, Jianli Wang, Shane J. Kennedy, Stewart J. Campbell, S X. Dou
Magnetic Properties And Magnetocaloric Effect In Layered Ndmn1.9ti0.1si2, M F. Md Din, Jianli Wang, Shane J. Kennedy, Stewart J. Campbell, S X. Dou
Australian Institute for Innovative Materials - Papers
The structural and magnetic properties of the NdMn1.9Ti0.1Si2 compund have been studied by high-intensity x-ray and high-resolution neutron powder diffraction, specific heat, dc magnetization, and differential scanning calorimetry measurements over the temperature range of 3-450 K. The Curie temperature and Néel temperature of layered NdMn1.9Ti0.1Si2 are indicated as TC ~ 22 K and TN ~ 374 K respectively. The first order magnetic transition from antiferromagnetic [AFil-type] to ferromagnetic [F(Nd)+Fmc] around TC is found in layered NdMn1.9Ti0.1Si2 and is …
Photoelectrochemical Reduction Of Aqueous Protons With A Cuo|Cubi2o4 Heterojunction Under Visible Light Irradiation, Hyun S. Park, Chong-Yong Lee, Erwin Reisner
Photoelectrochemical Reduction Of Aqueous Protons With A Cuo|Cubi2o4 Heterojunction Under Visible Light Irradiation, Hyun S. Park, Chong-Yong Lee, Erwin Reisner
Australian Institute for Innovative Materials - Papers
A p-type heterojunction photoelectrode consisting of platinized CuBi2O4 layered on a CuO film was prepared. The CuO|CuBi2O4|Pt electrode photo-generates H2 in pH neutral aqueous solution during visible light irradiation and exhibits a substantially enhanced photocurrent compared to CuO|Pt and CuBi2O4|Pt electrodes. Reduced electron-hole recombination by the band offsets in the heterostructure is responsible for the improved photoelectrochemical performance of CuO|CuBi2O4 with a small band-gap of approximately 1.5 eV.
Pristine Organo-Imido Polyoxometalates As An Anode For Lithium Ion Batteries, Rao Naumaan Nasim Khan, Nasir Mahmood, Chunlin Lv, Guohui Sima, Jin Zhang, Jian Hao, Yanglong Hou, Yongge Wei
Pristine Organo-Imido Polyoxometalates As An Anode For Lithium Ion Batteries, Rao Naumaan Nasim Khan, Nasir Mahmood, Chunlin Lv, Guohui Sima, Jin Zhang, Jian Hao, Yanglong Hou, Yongge Wei
Australian Institute for Innovative Materials - Papers
Here we have designed a strategy to improve the electronic conductivities of polyoxometalates (POMs) via property-oriented organic grafting for use in lithium-ion batteries (LIBs). POMs usually exhibit limited electronic conductivity that hinders their use in electronic applications. Organic grafting of POMs defines a valuable path for improving electronic conductivities of POMs, due to the enhanced metal to ligand charge transfer (MLCT) via d-π electronic interactions, and results in their feasible application in LIBs. Comparative practical and theoretical study of the effect of functional groups revealed that grafting of the remote electron withdrawing group (-SCN) on POMs via organo-imidoylization along with …
One-Pot Synthesis Of Α-Fe2o3 Nanoparticles-Decorated Reduced Graphene Oxide For Efficient Nonenzymatic H2o2 Biosensor, Ming-Yan Wang, Tao Shen, Meng Wang, Dong-En Zhang, Zhi-Wei Tong, Jun Chen
One-Pot Synthesis Of Α-Fe2o3 Nanoparticles-Decorated Reduced Graphene Oxide For Efficient Nonenzymatic H2o2 Biosensor, Ming-Yan Wang, Tao Shen, Meng Wang, Dong-En Zhang, Zhi-Wei Tong, Jun Chen
Australian Institute for Innovative Materials - Papers
Hematite nanoparticles (α-Fe2O3) are successfully decorated on the reduced graphene oxide (rGO) sheets through a simple, one-step, hydrothermal method without addition of other reducing agents. The α-Fe2O3/rGO hybrid was characterized by scanning electron micrographs, X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy. This α-Fe2O3/rGO hybrid has been successfully applied in the catalytic performance toward the reduction of H2O2. The nonenzymatic sensor demonstrates a linear relationship over a wide concentration range of 5.0–4495.0 μM (R = 0.9998), a low detection limit of 1.0 μM, and a high sensitivity of 126.9 μA cm−2 mM−1 to the detection of H2O2.
Spin Memristive Magnetic Tunnel Junctions With Coo-Zno Nano Composite Barrier, Qiang Li, Ting-Ting Shen, Yan-Ling Cao, Kun Zhang, Shi-Shen Yan, Yu-Feng Tian, Shi-Shou Kang, Ming-Wen Zhao, You-Yong Dai, Yan-Xue Chen, Guo-Lei Liu, Liang-Mo Mei, Xiaolin Wang, Peter Grunberg
Spin Memristive Magnetic Tunnel Junctions With Coo-Zno Nano Composite Barrier, Qiang Li, Ting-Ting Shen, Yan-Ling Cao, Kun Zhang, Shi-Shen Yan, Yu-Feng Tian, Shi-Shou Kang, Ming-Wen Zhao, You-Yong Dai, Yan-Xue Chen, Guo-Lei Liu, Liang-Mo Mei, Xiaolin Wang, Peter Grunberg
Australian Institute for Innovative Materials - Papers
The spin memristive devices combining memristance and tunneling magnetoresistance have promising applications in multibit nonvolatile data storage and artificial neuronal computing. However, it is a great challenge for simultaneous realization of large memristance and magnetoresistance in one nanoscale junction, because it is very hard to find a proper spacer layer which not only serves as good insulating layer for tunneling magnetoresistance but also easily switches between high and low resistance states under electrical field. Here we firstly propose to use nanon composite barrier layers of CoO-ZnO to fabricate the spin memristive Co/CoO-ZnO/Co magnetic tunnel junctions. The bipolar resistance switching ratio …
Fabrication Of Graphene Foam Supported Carbon Nanotube/Polyaniline Hybrids For High-Performance Supercapacitor Applications, Hongxia Yang, Nan Wang, Qun Xu, Zhimin Chen, Yumei Ren, Joselito M. Razal, Jun Chen
Fabrication Of Graphene Foam Supported Carbon Nanotube/Polyaniline Hybrids For High-Performance Supercapacitor Applications, Hongxia Yang, Nan Wang, Qun Xu, Zhimin Chen, Yumei Ren, Joselito M. Razal, Jun Chen
Australian Institute for Innovative Materials - Papers
A large-scale, high-powered energy storage system is crucial for addressing the energy problem. The development of high-performance materials is a key issue in realizing the grid-scale applications of energy-storage devices. In this work, we describe a simple and scalable method for fabricating hybrids (graphenepyrrole/ carbon nanotube-polyaniline (GPCP)) using graphene foam as the supporting template. Graphene-pyrrole (G-Py) aerogels are prepared via a green hydrothermal route from two-dimensional materials such as graphene sheets, while a carbon nanotube/polyaniline (CNT/PANI) composite dispersion is obtained via the in situ polymerization method. The functional nanohybrid materials of GPCP can be assembled by simply dipping the prepared …
The Synergistic Effect Between Wo3 And G-C3n4 Towards Efficient Visible-Light-Driven Photocatalytic Performance, Imran Aslam, Chuanbao Cao, M Tanveer, Waheed S. Khan, Muhammad Nawaz Tahir, Muhammad Abid, Faryal Idrees, Faheem K. Butt, Zulfiqar Ali, Nasir Mahmood
The Synergistic Effect Between Wo3 And G-C3n4 Towards Efficient Visible-Light-Driven Photocatalytic Performance, Imran Aslam, Chuanbao Cao, M Tanveer, Waheed S. Khan, Muhammad Nawaz Tahir, Muhammad Abid, Faryal Idrees, Faheem K. Butt, Zulfiqar Ali, Nasir Mahmood
Australian Institute for Innovative Materials - Papers
We have developed a facile, scaled up, efficient and morphology-based novel WO3-g-C3N4 photocatalyst with different mass ratios of WO3 and g-C3N4. It was used for the photodegradation of rhodamine B (RhB) under visible light irradiation and it showed excellent enhanced photocatalytic efficiency as compared to pure g-C3N4 and WO3. The apparent performance of the composite/hybrid was 3.65 times greater than pure WO3 and 3.72 times greater than pure g-C3N4 respectively, and it was also found to be much higher than the previously reported ones. Furthermore, the optical properties of composite samples were evaluated. The bandgap of composite samples lies in …
Graphene-Based Nanocomposites For Energy Storage And Conversion In Lithium Batteries, Supercapacitors And Fuel Cells, Nasir Mahmood, Chenzhen Zhang, Han Yin, Yanglong Hou
Graphene-Based Nanocomposites For Energy Storage And Conversion In Lithium Batteries, Supercapacitors And Fuel Cells, Nasir Mahmood, Chenzhen Zhang, Han Yin, Yanglong Hou
Australian Institute for Innovative Materials - Papers
Due to their unique properties, together with their ease of synthesis and functionalization, graphene-based materials have been showing great potential in energy storage and conversion. These hybrid structures display excellent material characteristics, including high carrier mobility, faster recombination rate and long-time stability. In this review, after a short introduction to graphene and its derivatives, we summarize the recent advances in the synthesis and applications of graphene and its derivatives in the fields of energy storage (lithium ion, lithium-air, lithium-sulphur batteries and supercapacitors) and conversion (oxygen reduction reaction for fuel cells). This article further highlights the working principles and problems hindering …
Soc Estimation For Lifepo4 Battery In Evs Using Recursive Least-Squares With Multiple Adaptive Forgetting Factors, Van Huan Duong, Hany A. Bastawrous, Kai Chin Lim, Khay Wai W. See, Peng Zhang, S X. Dou
Soc Estimation For Lifepo4 Battery In Evs Using Recursive Least-Squares With Multiple Adaptive Forgetting Factors, Van Huan Duong, Hany A. Bastawrous, Kai Chin Lim, Khay Wai W. See, Peng Zhang, S X. Dou
Australian Institute for Innovative Materials - Papers
This work presents a novel technique which is simple yet effective in estimating electric model parameters and state-of-charge (SOC) of the LiFePO4 battery. Unlike the well-known recursive least-squares-based algorithms with single constant forgetting factor, this technique employs multiple adaptive forgetting factors to provide the capability to capture the different dynamics of model parameters. The validity of the proposed method is verified through experiments using actual driving cycles.
Electrode Nanostructures In Lithium-Based Batteries, Nasir Mahmood, Yanglong Hou
Electrode Nanostructures In Lithium-Based Batteries, Nasir Mahmood, Yanglong Hou
Australian Institute for Innovative Materials - Papers
Lithium-based batteries possessing energy densities much higher than those of the conventional batteries belong to the most promising class of future energy devices. However, there are some fundamental issues related to their electrodes which are big roadblocks in their applications to electric vehicles (EVs). Nanochemistry has advantageous roles to overcome these problems by defi ning new nanostructures of electrode materials. This review article will highlight the challenges associated with these chemistries both to bring high performance and longevity upon considering the working principles of the various types of lithium-based (Li-ion, Li-air and Li-S) batteries. Further, the review discusses the advantages …
Template Free Synthesis Of Cus Nanosheet-Based Hierarchical Microspheres: An Efficient Natural Light Driven Photocatalyst, M Tanveer, Chuanbao Cao, Zulfiqar Ali, Imran Aslam, Faryal Idrees, Waheed S. Khan, Faheem K. Butt, Muhammad Nawaz Tahir, Nasir Mahmood
Template Free Synthesis Of Cus Nanosheet-Based Hierarchical Microspheres: An Efficient Natural Light Driven Photocatalyst, M Tanveer, Chuanbao Cao, Zulfiqar Ali, Imran Aslam, Faryal Idrees, Waheed S. Khan, Faheem K. Butt, Muhammad Nawaz Tahir, Nasir Mahmood
Australian Institute for Innovative Materials - Papers
Well controlled nanosheets-based hierarchical microspheres (NSHMS) of pure covellite phase CuS were synthesized using a facile PVP assisted solvothermal process. The reaction conditions were optimized using various amounts of PVP to develop unique hierarchical structured hollow microspheres. CuS hollow structures have a bandgap of ~1.97 eV. These mesoporous structures exhibit excellent photocatalytic activity in degradation of organic dyes (Methylene Blue) under natural light in comparison to other structures of copper sulphide. These photocatalysts show extraordinary reusability with over 96.5% degradation of organic dye after 6th cycle. A "bottom-up" assembly was successfully developed to synthesize hollow microspheres with unique and well …
Polarization Alignment, Phase Transition, And Piezoelectricity Development In Polycrystalline 0.5ba(Zr0.2 Ti0.8)O3-0.5(Ba0.7 Ca0.3)Tio3, Hanzheng Guo, Brian K. Voas, Shujun Zhang, Chao Zhou, Xiaobing Ren, Scott P. Beckman, Xiaoli Tan
Polarization Alignment, Phase Transition, And Piezoelectricity Development In Polycrystalline 0.5ba(Zr0.2 Ti0.8)O3-0.5(Ba0.7 Ca0.3)Tio3, Hanzheng Guo, Brian K. Voas, Shujun Zhang, Chao Zhou, Xiaobing Ren, Scott P. Beckman, Xiaoli Tan
Australian Institute for Innovative Materials - Papers
The microstructural origin of the exceptionally high piezoelectric response of polycrystalline 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 is investigated using in situ transmission electron microscopy, in addition to a wide variety of bulk measurements and first-principles calculations. A direct correlation is established relating a domain wall-free state to the ultrahigh piezoelectric d33 coefficient in this BaTiO3-based composition. The results suggest that the unique single-domain state formed during electrical poling is a result of a structural transition from coexistent rhombohedral and tetragonal phases to an orthorhombic phase that has an anomalously low elastic modulus. First-principles calculations indicate that incorporating Ca2+ and Zr4+ into BaTiO3 reduces the …
Pmn-Pt Based Quaternary Piezoceramics With Enhanced Piezoelectricity And Temperature Stability, Nengneng Luo, Shujun Zhang, Qiang Li, Qingfeng Yan, Wenhui He, Yiling Zhang, Thomas R. Shrout
Pmn-Pt Based Quaternary Piezoceramics With Enhanced Piezoelectricity And Temperature Stability, Nengneng Luo, Shujun Zhang, Qiang Li, Qingfeng Yan, Wenhui He, Yiling Zhang, Thomas R. Shrout
Australian Institute for Innovative Materials - Papers
The phase structure, piezoelectric, dielectric, and ferroelectric properties of (0.80-x)PMN-0.10PFN-0.10PZ-xPT were investigated systematically. The morphotropic phase boundary (MPB) was confirmed to be 0.30
Achieving Single Domain Relaxor-Pt Crystals By High Temperature Poling, Fei Li, Linghang Wang, Li Jin, Zhuo Xu, Shujun Zhang
Achieving Single Domain Relaxor-Pt Crystals By High Temperature Poling, Fei Li, Linghang Wang, Li Jin, Zhuo Xu, Shujun Zhang
Australian Institute for Innovative Materials - Papers
Single domain relaxor-PT crystals are important from both fundamental and application viewpoints. Compared to domain engineered relaxor-PT crystals, however, single domain crystals are prone to cracking during poling. In this paper, based on the analysis of the cracking phenomenon in [001] poled tetragonal 0.25Pb(In0.5Nb0.5)O3-0.37Pb(Mg 1/3Nb2/3)O3-0.38PbTiO3 (PIN-PMN-PT) crystals, the non-180°ferroelastic domain switching was thought to be the dominant factor for cracking during the poling process. A high temperature poling technique, by which the domain switching can be greatly avoided, was proposed to achieve the single domain relaxor-PT crystals. By this poling approach, a quasi-single domain crystal was obtained without cracks. In …
Electrostrictive Effect In Ferroelectrics: An Alternative Approach To Improve Piezoelectricity, Fei Li, Li Jin, Zhuo Xu, Shujun Zhang
Electrostrictive Effect In Ferroelectrics: An Alternative Approach To Improve Piezoelectricity, Fei Li, Li Jin, Zhuo Xu, Shujun Zhang
Australian Institute for Innovative Materials - Papers
Electrostriction plays an important role in the electromechanical behavior of ferroelectrics and describes a phenomenon in dielectrics where the strain varies proportional to the square of the electric field/polarization. Perovskite ferroelectrics demonstrating high piezoelectric performance, including BaTiO3, Pb(Zr1-xTix)O3, and relaxor-PbTiO3 materials, have been widely used in various electromechanical devices. To improve the piezoelectric activity of these materials, efforts have been focused on the ferroelectric phase transition regions, including shift the composition to the morphotropic phase boundary or shift polymorphic phase transition to room temperature. However, there is not much room left to further enhance the piezoelectric response in perovskite solid …
Microwave Autoclave Synthesized Multi-Layer Graphene/Single-Walled Carbon Nanotube Composites For Free-Standing Lithium-Ion Battery Anodes, Chao Zhong, Jia-Zhao Wang, David Wexler, Hua-Kun Liu
Microwave Autoclave Synthesized Multi-Layer Graphene/Single-Walled Carbon Nanotube Composites For Free-Standing Lithium-Ion Battery Anodes, Chao Zhong, Jia-Zhao Wang, David Wexler, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
Multi-layer graphene sheets have been synthesized by a time-efficient microwave autoclave method and used to form composites in situ with single-walled carbon nanotubes. The application of these composites as flexible free-standing film electrodes was then investigated. According to the transmission electron microscopy and X-ray diffraction characterizations, the average d-spacing of the graphene-single-walled carbon nanotube composites was 0.41 nm, which was obviously larger than that of the as-prepared pure graphene (0.36 nm). The reversible Li-cycling properties of the free-standing films have been evaluated by galvanostatic discharge-charge cycling and electrochemical impedance spectroscopy. Results showed that the free-standing composite film with 70 wt% …
Direct Synthesis Of Rgo/Cu2o Composite Films On Cu Foil For Supercapacitors, Xiangmao Dong, Kun Wang, Chongjun Zhao, Xiuzhen Qian, Shi Chen, Zhen Li, Hua-Kun Liu, S X. Dou
Direct Synthesis Of Rgo/Cu2o Composite Films On Cu Foil For Supercapacitors, Xiangmao Dong, Kun Wang, Chongjun Zhao, Xiuzhen Qian, Shi Chen, Zhen Li, Hua-Kun Liu, S X. Dou
Australian Institute for Innovative Materials - Papers
Reduced graphene oxide/cuprous oxide (RGO/Cu2O) composite films were directly synthesized on the surface of copper foil substrates through a straight redox reaction between GO and Cu foil via a hydrothermal approach. Characterization of the resultant composites with X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and field emission scanning electron microscope (FESEM) confirms the formation of Cu2O and reduction of GO, in which Cu2O nanoparticles were well covered by RGO. The resultant composites (referred to as RGO/Cu2O/Cu) were directly used as electrodes for supercapacitors, and their electrochemical performance was assessed by cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectrometry …