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Articles 691 - 720 of 1524
Full-Text Articles in Physical Sciences and Mathematics
General Synthesis Of Transition Metal Oxide Ultrafine Nanoparticles Embedded In Hierarchically Porous Carbon Nanofibers As Advanced Electrodes For Lithium Storage, Guanglin Xia, Lijun Zhang, Fang Fang, Dalin Sun, Zaiping Guo, Hua-Kun Liu, Xuebin Yu
General Synthesis Of Transition Metal Oxide Ultrafine Nanoparticles Embedded In Hierarchically Porous Carbon Nanofibers As Advanced Electrodes For Lithium Storage, Guanglin Xia, Lijun Zhang, Fang Fang, Dalin Sun, Zaiping Guo, Hua-Kun Liu, Xuebin Yu
Australian Institute for Innovative Materials - Papers
A unique general, large-scale, simple, and cost-effective strategy, i.e., foaming-assisted electrospinning, for fabricating various transition metal oxides into ultrafine nanoparticles (TMOs UNPs) that are uniformly embedded in hierarchically porous carbon nanofibers (HPCNFs) has been developed. Taking advantage of the strong repulsive forces of metal azides as the pore generator during carbonization, the formation of uniform TMOs UNPs with homogeneous distribution and HPCNFs is simultaneously implemented. The combination of uniform ultrasmall TMOs UNPs with homogeneous distribution and hierarchically porous carbon nanofibers with interconnected nanostructure can effectively avoid the aggregation, dissolution, and pulverization of TMOs, promote the rapid 3D transport of both …
A Cytocompatible Robust Hybrid Conducting Polymer Hydrogel For Use In A Magnesium Battery, Changchun Yu, Caiyun Wang, Xiao Liu, Xiaoteng Jia, Sina Naficy, Kewei Shu, Maria Forsyth, Gordon G. Wallace
A Cytocompatible Robust Hybrid Conducting Polymer Hydrogel For Use In A Magnesium Battery, Changchun Yu, Caiyun Wang, Xiao Liu, Xiaoteng Jia, Sina Naficy, Kewei Shu, Maria Forsyth, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
A cytocompatible robust hybrid conducting polymer hydrogel, polypyrrole/poly(3,4-ethylenedioxythiophene) is developed. This hydrogel is suitable for electrode-cellular applications. It demonstrates a high battery performance when coupled with a bioresorbable Mg alloy in phosphate-buffered saline. A combination of suitable mechanical and electrochemical properties makes this hydrogel a promising material for bionic applications.
Integrated Carbon/Red Phosphorus/Graphene Aerogel 3d Architecture Via Advanced Vapor-Redistribution For High-Energy Sodium-Ion Batteries, Hong Gao, Tengfei Zhou, Yang Zheng, Yuqing Liu, Jun Chen, Hua-Kun Liu, Zaiping Guo
Integrated Carbon/Red Phosphorus/Graphene Aerogel 3d Architecture Via Advanced Vapor-Redistribution For High-Energy Sodium-Ion Batteries, Hong Gao, Tengfei Zhou, Yang Zheng, Yuqing Liu, Jun Chen, Hua-Kun Liu, Zaiping Guo
Australian Institute for Innovative Materials - Papers
Sodium ion batteries (SIBs), a potential alternative to lithium ion batteries (LIBs), have attracted remarkable attention recently due to the abundant natural resources for their precursors and their low cost.[1-3] The requirement of feasible electrode materials with high sodium storage capacity and good cycling stability has promoted the exploration of various electrode materials for SIBs.
3-D Structured Sno2-Polypyrrole Nanotubes Applied In Na-Ion Batteries, Boyang Ruan, Haipeng Guo, Qiannan Liu, Dongqi Shi, Shulei Chou, Hua-Kun Liu, Guohua Chen, Jiazhao Wang
3-D Structured Sno2-Polypyrrole Nanotubes Applied In Na-Ion Batteries, Boyang Ruan, Haipeng Guo, Qiannan Liu, Dongqi Shi, Shulei Chou, Hua-Kun Liu, Guohua Chen, Jiazhao Wang
Australian Institute for Innovative Materials - Papers
SnO2-coated polypyrrole (PPy) with a three-dimensional (3-D) structured nanotube network has been prepared via a facile hydrothermal method and tested as an anode material for Na-ion batteries. The crystalline SnO2 nanoparticles (less than 25 nm in size) are distributed uniformly on the surfaces of the PPy tubes. When it is used as an anode material for sodium-ion batteries (SIBs), the composite electrode can deliver a good reversible capacity of nearly 288 mA h g-1 when discharging at 100 mA g-1, with more than 69.1% capacity retention and stable coulombic efficiency of 99.6% after 150 cycles. The good electrochemical performance compared …
Metal-Silicene Interaction Studied By Scanning Tunneling Microscopy, Zhi Li, Haifeng Feng, Jincheng Zhuang, Na Pu, Li Wang, Xun Xu, Weichang Hao, Yi Du
Metal-Silicene Interaction Studied By Scanning Tunneling Microscopy, Zhi Li, Haifeng Feng, Jincheng Zhuang, Na Pu, Li Wang, Xun Xu, Weichang Hao, Yi Du
Australian Institute for Innovative Materials - Papers
Ag atoms have been deposited on 3 x 3 silicene and √3 x √3 silicene films by molecular beam epitaxy method in ultrahigh vacuum. Using scanning tunneling microscopy and Raman spectroscopy, we found that Ag atoms do not form chemical bonds with both 3 x 3 silicene and √3 x √3 silicene films, which is due to the chemically inert surface of silicene. On 3 x 3 silicene films, Ag atoms mostly form into stable flat-top Ag islands. In contrast, Ag atoms form nanoclusters and glide on silicene films, suggesting a more inert nature. Raman spectroscopy suggests that there is …
Manipulating Coupling State And Magnetism Of Mn-Doped Zno Nanocrystals By Changing The Coordination Environment Of Mn Via Hydrogen Annealing, Yan Cheng, W Li, Weichang Hao, Huaizhe Xu, Zhongfei Xu, Li Rong Zheng, Jing Zhang, S X. Dou, Tianmin Wang
Manipulating Coupling State And Magnetism Of Mn-Doped Zno Nanocrystals By Changing The Coordination Environment Of Mn Via Hydrogen Annealing, Yan Cheng, W Li, Weichang Hao, Huaizhe Xu, Zhongfei Xu, Li Rong Zheng, Jing Zhang, S X. Dou, Tianmin Wang
Australian Institute for Innovative Materials - Papers
Mn-doped ZnO nanocrystals are synthesized by a wet chemical route and treated in H2/Ar atmosphere with different H2/Ar ratios. It is found that hydrogen annealing could change the coordination environment of Mn in ZnO lattice and manipulate the magnetic properties of Mn-doped ZnO. Mn ions initially enter into interstitial sites and a Mn3+O6 octahedral coordination is produced in the prepared Mn-doped ZnO sample, in which the nearest neighbor Mn3+ and O2 ions could form a Mn3+-O2--Mn3+ complex. After H2 annealing, interstitial Mn ions can substitute for Zn to generate the Mn2+O4 tetrahedral coordination in the nanocrystals, in which neighboring Mn2+ …
Β -Nmr Investigation Of The Depth-Dependent Magnetic Properties Of An Antiferromagnetic Surface, David L. Cortie, T Buck, M Dehn, V L. Karner, R F. Kiefl, C D. P Levy, R M. L Mcfadden, G D. Morris, I Mckenzie, M R. Pearson, Xiaolin Wang, W A. Macfarlane
Β -Nmr Investigation Of The Depth-Dependent Magnetic Properties Of An Antiferromagnetic Surface, David L. Cortie, T Buck, M Dehn, V L. Karner, R F. Kiefl, C D. P Levy, R M. L Mcfadden, G D. Morris, I Mckenzie, M R. Pearson, Xiaolin Wang, W A. Macfarlane
Australian Institute for Innovative Materials - Papers
By measuring the prototypical antiferromagnet α-Fe2O3, we show that it is possible to determine the static spin orientation and dynamic spin correlations within nanometers from an antiferromagnetic surface using the nuclear spin polarization of implanted 8Liþ ions detected with β-NMR. Remarkably, the firstorder Morin spin reorientation in single crystal α-Fe2O3 occurs at the same temperature at all depths between 1 and 100 nm from the (110) surface; however, the implanted nuclear spin experiences an increased 1=T1 relaxation rate at shallow depths revealing soft-surface magnons. The surface-localized dynamics decay towards the bulk with a characteristic length of ϵ ¼ 11 1 …
Significant Enhancement Of The Cycling Performance And Rate Capability Of The P/C Composite Via Chemical Bonding (P-C), Weijie Li, Shulei Chou, Jiazhao Wang, Hua-Kun Liu, S X. Dou
Significant Enhancement Of The Cycling Performance And Rate Capability Of The P/C Composite Via Chemical Bonding (P-C), Weijie Li, Shulei Chou, Jiazhao Wang, Hua-Kun Liu, S X. Dou
Australian Institute for Innovative Materials - Papers
Among anode materials for sodium ion batteries, red phosphorus is a very promising one due to its abundant reserves, low-cost and high theoretical capacity of 2600 mA h g-1. However, its huge volume expansion on sodiation (∼490%) and poor conductivity leads to dramatic capacity decay, restraining its practical application. To improve the electrochemical performance, here, we prepared a red phosphorus and graphene nanoplate composite using cheap red P and natural graphite as the starting materials via a simple and scalable ball-milling method. The phosphorus-carbon bond formed during the milling process improves the electrical connectivity between P particles and graphene nanoplates, …
Controllable Synthesis Of Few-Layered And Hierarchically Porous Boron Nitride Nanosheets, Feng Xiao, Zhixin Chen, Gilberto Casillas, Christopher Richardson, Huijun Li, Zhenguo Huang
Controllable Synthesis Of Few-Layered And Hierarchically Porous Boron Nitride Nanosheets, Feng Xiao, Zhixin Chen, Gilberto Casillas, Christopher Richardson, Huijun Li, Zhenguo Huang
Australian Institute for Innovative Materials - Papers
Few-layered porous boron nitride nanosheets (BNNS) have been prepared using a dynamic magnesium diboride (MgB2) template and ammonium chloride (NH4Cl) etchant. Magnesium-based intermediates serve as layer separators in the synthesis and prevent extensive aggregation, resulting in few-layered BNNS. The resultant BNNS are hierarchically porous and show good CO2/N2 adsorption selectivity.
Probing The Pedot:Pss/Cell Interface With Conductive Colloidal Probe Afm-Secm, P Knittel, Hao Zhang, Christine Kranz, Gordon G. Wallace, Michael J. Higgins
Probing The Pedot:Pss/Cell Interface With Conductive Colloidal Probe Afm-Secm, P Knittel, Hao Zhang, Christine Kranz, Gordon G. Wallace, Michael J. Higgins
Australian Institute for Innovative Materials - Papers
Conductive colloidal probe Atomic Force-Scanning Electrochemical Microscopy (AFM-SECM) is a new approach, which employs electrically insulated AFM probes except for a gold-coated colloid located at the end of the cantilever. Hence, force measurements can be performed while biasing the conductive colloid under physiological conditions. Moreover, such colloids can be modified by electrochemical polymerization resulting, e.g. in conductive polymer-coated spheres, which in addition may be loaded with specific dopants. In contrast to other AFM-based single cell force spectroscopy measurements, these probes allow adhesion measurements at the cell-biomaterial interface on multiple cells in a rapid manner while the properties of the polymer …
A High-Performance Rechargeable Mg2+/Li+ Hybrid Battery Using One-Dimensional Mesoporous Tio2(B) Nanoflakes As The Cathode, Shuojian Su, Yanna Nuli, Zhenguo Huang, Qi Miao, Jun Yang, Jiulin Wang
A High-Performance Rechargeable Mg2+/Li+ Hybrid Battery Using One-Dimensional Mesoporous Tio2(B) Nanoflakes As The Cathode, Shuojian Su, Yanna Nuli, Zhenguo Huang, Qi Miao, Jun Yang, Jiulin Wang
Australian Institute for Innovative Materials - Papers
Mg2+/Li+ hybrid batteries have recently been constructed combining a Mg anode, a Li+-intercalation electrode, and an electrolyte containing both Mg2+ and Li+. These batteries have been reported to outperform all the previously reported magnesium batteries in terms of specific capacity, cycling stability, and rate capability. Herein, we report the outstanding electrochemical performance of Mg2+/Li+ hybrid batteries consisting of a one-dimensional mesoporous TiO2(B) cathode, a Mg anode, and an electrolyte consisting of 0.5 mol L-1 Mg(BH4)2 + 1.5 mol L-1 LiBH4 in tetraglyme. A highly synergetic interaction between Li+ and Mg2+ ions toward the pseudo-capacitive reaction is proposed. The hybrid batteries …
Substituted Ferrocenes And Iodine As Synergistic Thermoelectrochemical Heat Harvesting Redox Couples In Ionic Liquids, E H.B Anari, Mark S. Romano, W X. Teh, J J. Black, E Jiang, Jun Chen, T Q. To, J Panchompoo, Leigh Aldous
Substituted Ferrocenes And Iodine As Synergistic Thermoelectrochemical Heat Harvesting Redox Couples In Ionic Liquids, E H.B Anari, Mark S. Romano, W X. Teh, J J. Black, E Jiang, Jun Chen, T Q. To, J Panchompoo, Leigh Aldous
Australian Institute for Innovative Materials - Papers
2016 The Royal Society of Chemistry. Combining ferrocene and iodine results in enhanced thermoelectrochemical (or thermogalvanic) waste heat harvesting abilities, for both the Seebeck coefficient and the overall power output. All systems displayed a mixture of ferrocene, ferrocenium, iodine and triiodide. The observed enhancement correlates with lower electron-density on the ferrocene; the synergistic improvement observed for mixtures of substituted ferrocenes and iodine is attributed to the formation of charge-transfer complexes. Combining dibutanoylferrocene and iodine resulted in the highest Seebeck coefficient of 1.67 mV K-1.
Direct Measurements Of Field-Dependent Ordering In A Low-Field Vortex Glass State, Frederick Wells, Alexey V. Pan, X Renshaw Wang, Igor A. Golovchanskiy, Sergey Fedoseev, Hans Hilgenkamp, Anatoly B. Rosenfeld
Direct Measurements Of Field-Dependent Ordering In A Low-Field Vortex Glass State, Frederick Wells, Alexey V. Pan, X Renshaw Wang, Igor A. Golovchanskiy, Sergey Fedoseev, Hans Hilgenkamp, Anatoly B. Rosenfeld
Australian Institute for Innovative Materials - Papers
The variation of topological defect density and hexatic order parameter were measured over a range of micro-Tesla fields in a 2-D superconducting vortex glass. This was achieved through scanning SQUID microscopy of the vortex distribution in YBa2Cu3O7−δ thin films under field-cooled conditions. It was discovered that, although the defect density decreased for increasing magnetic fields, giving the impression of a more lattice-like vortex distribution, the hexatic order parameter also decreased, showing that the distribution was less orientationally ordered.
Tuning Superconductivity In Fese Thin Films Via Magnesium Doping, Wenbin Qiu, Zongqing Ma, Yongchang Liu, Md Shahriar Hossain, Xiaolin Wang, Chuanbing Cai, S X. Dou
Tuning Superconductivity In Fese Thin Films Via Magnesium Doping, Wenbin Qiu, Zongqing Ma, Yongchang Liu, Md Shahriar Hossain, Xiaolin Wang, Chuanbing Cai, S X. Dou
Australian Institute for Innovative Materials - Papers
In contrast to its bulk crystal, the FeSe thin film or layer exhibits better superconductivity performance, which recently attracted much interest in its fundamental research as well as in potential applications around the world. In the present work, tuning superconductivity in FeSe thin films was achieved by magnesium-doping technique. Tc is significantly enhanced from 10.7 K in pure FeSe films to 13.4 K in optimized Mg-doped ones, which is approximately 1.5 times higher than that of bulk crystals. This is the first time achieving the enhancement of superconducting transition temperature in FeSe thin films with practical thickness (120 nm) via …
Ultrathin Porous Nio Nanoflake Arrays On Nickel Foam As Binder-Free Electrodes For Supercapacitors, Qing Liu, Qinglong Yan, Shuang Wu, Jieqiang Wang, Hua-Kun Liu
Ultrathin Porous Nio Nanoflake Arrays On Nickel Foam As Binder-Free Electrodes For Supercapacitors, Qing Liu, Qinglong Yan, Shuang Wu, Jieqiang Wang, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
NiO nanopowders and NiO/nickel foam (NF) hybrid were synthesized by microwave hydrothermal method and the following heating process. NiO nanopowders show the morphology of microspheres (diameter is about 3μm), which are composed of porous nanoflakes. NiO/NF hybrid shows a porous nanoflakes array structure, the thickness of nanoflakes is 10nm. Electrochemical measurements indicate that the maximum specific capacitance of NiO nanopowders is about 85.4 F/g at a scan rate of 5 mV/s, while this value is up to 234.8 F/g for NiO/NF hybrid. Electrochemical impedance spectrum (EIS) data show that the Rs and Rct values of NiO/NF hybrid (1.9Ù and 0.25Ù) …
Conductive And Protein Resistant Polypyrrole Films For Dexamethasone Delivery, Binbin Zhang, Paul J. Molino, Alexander R. Harris, Zhilian Yue, Simon E. Moulton, Gordon G. Wallace
Conductive And Protein Resistant Polypyrrole Films For Dexamethasone Delivery, Binbin Zhang, Paul J. Molino, Alexander R. Harris, Zhilian Yue, Simon E. Moulton, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
The development of inherently conducting polymers as controllable/programmable drug delivery systems has attracted significant interest in medical bionics, and the interfacial properties of the polymers, in particular, protein adsorption characteristics, is integral to the stability of the overall performance. Herein we report a hybrid conducting system based on polypyrrole doped with an anti-inflammatory prodrug, dexamethasone phosphate (DexP), upon which post-surface modification was conducted to render the polymer more biostable. We firstly investigated the influence of the current density and DexP concentration on the physiochemical properties and surface characteristics of the resulting polymer films. Films were then surface modified with thiolated …
Electrochemically Active, Novel Layered M-Znv2o6 Nanobelts For Highly Rechargeable Na-Ion Energy Storage, Yan Sun, Chun-Sheng Li, Qiuran Yang, Shulei Chou, Hua-Kun Liu
Electrochemically Active, Novel Layered M-Znv2o6 Nanobelts For Highly Rechargeable Na-Ion Energy Storage, Yan Sun, Chun-Sheng Li, Qiuran Yang, Shulei Chou, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
Electrode materials with a three-dimensional (3D) layered framework and excellent electrochemical stability can provide a new avenue for enhancing the overall performance of promising sodium ion batteries. Here, we show that layered monoclinic (m) - ZnV2O6 nanobelts with high chemical activity for Na-ion energy storage have been effectively fabricated via a rapid microwave irradiation method over the reaction time of 8 h, in which the fabricating efficiency is 24.5 times greater in comparison with the traditional hydrothermal method. The morphology and phase evolutions were verified by means of X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. This study also …
Characterisation Of Graphene Fibres And Graphene Coated Fibres Using Capacitively Coupled Contactless Conductivity Detector, Joan M. Cabot, Emer Duffy, Sinead Currivan, Andres Ruland Palaia, Rouhollah Jalili, Attila J. Mozer, Peter C. Innis, Gordon G. Wallace, Michael C. Breadmore, Brett Paull
Characterisation Of Graphene Fibres And Graphene Coated Fibres Using Capacitively Coupled Contactless Conductivity Detector, Joan M. Cabot, Emer Duffy, Sinead Currivan, Andres Ruland Palaia, Rouhollah Jalili, Attila J. Mozer, Peter C. Innis, Gordon G. Wallace, Michael C. Breadmore, Brett Paull
Australian Institute for Innovative Materials - Papers
The use of capacitively coupled contactless conductivity detection (C 4 D) for the characterisation of thin conductive graphene fi bres, graphene composite fi bres, and graphene coated fi brous materials is demon- strated for the fi rst time. Within a few seconds, the non-destructive C 4 D detector provides a pro fi le of the longetudinal physical homogeneity of the fi bre, as well as extra information regarding fi bre mophology and composition. In addition to the theoretical considerations related to the factors a ff ect the output signal, this work evaluates the properties of graphene fi bres using scanning …
Improved Superconducting Properties In The Mg11b2 Low Activation Superconductor Prepared By Low-Temperature Sintering, Fang Cheng, Yongchang Liu, Zongqing Ma, M Shahriar Al Hossain, Mehmet Somer
Improved Superconducting Properties In The Mg11b2 Low Activation Superconductor Prepared By Low-Temperature Sintering, Fang Cheng, Yongchang Liu, Zongqing Ma, M Shahriar Al Hossain, Mehmet Somer
Australian Institute for Innovative Materials - Papers
Mg11B2 has a great application prospect in the superconducting coils for fusion reactor as the "low activation superconductors". The un-doped Mg11B2 and Cu-doped Mg11B2 bulks using 11B as a boron precursor were fabricated by low-temperature sintering in present work. It was found that the prepared Mg11B2 low activation superconductors exhibit better Jc performance than all of other Mg11B2 samples reported in previous studies. As for Cu doped Mg11B2, minor Cu addition can obviously improve the Mg11B2 grain crystallization and reduce the amount of MgO impurity. Hence, improved grain connectivity and higher Jc at low fields is obtained in Cu doped …
Systematic Elongation Of Thienyl Linkers And Their Effect On Optical And Electrochemical Properties In Carbazole-Bodipy Donor-Acceptor Systems, Alina Brzeczek, Katarzyna Piwowar, Wojciech Domagala, Mikotaj M. Mikotajczyk, Krzysztof Walczak, Pawel W. Wagner
Systematic Elongation Of Thienyl Linkers And Their Effect On Optical And Electrochemical Properties In Carbazole-Bodipy Donor-Acceptor Systems, Alina Brzeczek, Katarzyna Piwowar, Wojciech Domagala, Mikotaj M. Mikotajczyk, Krzysztof Walczak, Pawel W. Wagner
Australian Institute for Innovative Materials - Papers
Synthesis, spectral and electrochemical properties of a series of new panchromatic BODIPY donor-acceptor-donor derivatives, comprising carbazole conjugated with systematically elongated framework by thiophene-based linkers were investigated. It has been found that elongation of the π-system with one thiophene unit shifts the spectra toward near infrared, while incorporation of next thiophene derivatives has only limited influence on the lowest energy transition, causing no further shift of absorption maxima. Elongation of π-conjugation of the donor arm tunes the electron properties, influencing the ionization potential (IP) and electron affinity (EA) values of the molecules. The experimental results are supported by quantum chemical computations …
Lead-Free Snte-Based Thermoelectrics: Enhancement Of Thermoelectric Performance By Doping With Gd/Ag, Lijuan Zhang, Jian Li Wang, Zhenxiang Cheng, Qiao Sun, Zhen Li, S X. Dou
Lead-Free Snte-Based Thermoelectrics: Enhancement Of Thermoelectric Performance By Doping With Gd/Ag, Lijuan Zhang, Jian Li Wang, Zhenxiang Cheng, Qiao Sun, Zhen Li, S X. Dou
Australian Institute for Innovative Materials - Papers
SnTe, with the same rock-salt structure as PbTe, is a potentially attractive thermoelectric material. Pristine SnTe has poor thermoelectric performance because of its very high hole concentration resulting from intrinsic Sn vacancies, which leads to a high thermal conductivity and a low Seebeck coefficient. In this work, the thermoelectric properties of SnTe were modified by doping with different contents of gadolinium and silver. It is found that SnTe doped with optimal gadolinium (i.e. Gd0.06Sn0.94Te) exhibited extraordinarily low lattice thermal conductivity that is close to the theoretical minimum. The drastic reduction of lattice thermal conductivity is attributed to the formation of …
Metal Frame As Local Protection Of Superconducting Films From Thermomagnetic Avalanches, Pavlo Mikheenko, J I. Vestgarden, Supratim Chaudhuri, I J. Maasilta, Y Galperin, Tom H. Johansen
Metal Frame As Local Protection Of Superconducting Films From Thermomagnetic Avalanches, Pavlo Mikheenko, J I. Vestgarden, Supratim Chaudhuri, I J. Maasilta, Y Galperin, Tom H. Johansen
Australian Institute for Innovative Materials - Papers
Thermomagnetic avalanches in superconducting films propagating extremely fast while forming unpredictable patterns, represent a serious threat for the performance of devices based on such materials. It is shown here that a normal-metal frame surrounding a selected region inside the film area can provide efficient protection from the avalanches during their propagation stage. Protective behavior is confirmed by magneto-optical imaging experiments on NbN films equipped with Cu and Al frames, and also by performing numerical simulations. Experimentally, it is found that while conventional flux creep is not affected by the frames, the dendritic avalanches are partially or fully screened by them. …
Correlation Among Physical And Electrochemical Behaviour Of Nanostructured Electrolytic Manganese Dioxide From Leach Liquor And Synthetic For Aqueous Asymmetric Capacitor, Manickam Minakshi, Avijit Biswal, David R. G Mitchell, Rob Jones, Carlos Fernandez
Correlation Among Physical And Electrochemical Behaviour Of Nanostructured Electrolytic Manganese Dioxide From Leach Liquor And Synthetic For Aqueous Asymmetric Capacitor, Manickam Minakshi, Avijit Biswal, David R. G Mitchell, Rob Jones, Carlos Fernandez
Australian Institute for Innovative Materials - Papers
An attempt has been made to correlate the differences in structural parameters, surface areas, morphology etc. with the electrochemical capacitive behaviour of the EMDs. The nanostructured electrolytic manganese dioxides (EMD) have been synthesized through electrodepositing MnO2 from two different leach liquors and a synthetic analogue thereof. The structural and chemical state was determined using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) respectively. Multiplet structure determination led to estimates of the manganese valence states present in the EMD. The EMDs have been tested in an asymmetric capacitor which we have developed. This used activated carbon as the negative electrode and …
Improved Cycling Stability Of Lithium-Sulphur Batteries By Enhancing The Retention Of Active Material With A Sandwiched Hydrothermally Treated Graphite Film, Yuede Pan, Shulei Chou, Hua-Kun Liu, S X. Dou
Improved Cycling Stability Of Lithium-Sulphur Batteries By Enhancing The Retention Of Active Material With A Sandwiched Hydrothermally Treated Graphite Film, Yuede Pan, Shulei Chou, Hua-Kun Liu, S X. Dou
Australian Institute for Innovative Materials - Papers
A new lithium-sulphur battery with a hydrothermally treated graphite film sandwiched between the separator and the sulphur cathode shows increased capacity, enhanced cycling stability and improved coulombic efficiency. After 50 cycles, a high capacity of 631 mA h g-1 is maintained, compared to 203 mA h g-1 for the Li-S battery with conventional configuration. Moreover, the coulombic efficiency is increased to near 100% from around 94%. This improved electrochemical performance could be attributed to the new cell configuration, because the graphite film greatly retains the active material by alleviating the polysulphide shuttling problem and providing extra reaction sites for sulphur …
Graphene-Wrapped Reversible Reaction For Advanced Hydrogen Storage, Guanglin Xia, Yingbin Tan, Feilong Wu, Fang Fang, Dalin Sun, Zaiping Guo, Zhenguo Huang, Xuebin Yu
Graphene-Wrapped Reversible Reaction For Advanced Hydrogen Storage, Guanglin Xia, Yingbin Tan, Feilong Wu, Fang Fang, Dalin Sun, Zaiping Guo, Zhenguo Huang, Xuebin Yu
Australian Institute for Innovative Materials - Papers
Here, we report the fabrication of a graphene-wrapped nanostructured reactive hydride composite, i.e., 2LiBH4-MgH2, made by adopting graphene-supported MgH2 nanoparticles (NPs) as the nanoreactor and heterogeneous nucleation sites. The porous structure, uniform distribution of MgH2 NPs, and the steric confinement by flexible graphene induced a homogeneous distribution of 2LiBH4-MgH2 nanocomposite on graphene with extremely high loading capacity (80 wt%) and energy density. The well-defined structural features, including even distribution, uniform particle size, excellent thermal stability, and robust architecture endow this composite with significant improvements in its hydrogen storage performance. For instance, at a temperature as low as 350 °C, a …
Binder-Free And Carbon-Free 3d Porous Air Electrode For Li-O2 Batteries With High Efficiency, High Capacity, And Long Life, Wenbin Luo, Xuanwen Gao, Dongqi Shi, Shulei Chou, Jiazhao Wang, Hua-Kun Liu
Binder-Free And Carbon-Free 3d Porous Air Electrode For Li-O2 Batteries With High Efficiency, High Capacity, And Long Life, Wenbin Luo, Xuanwen Gao, Dongqi Shi, Shulei Chou, Jiazhao Wang, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
Pt-Gd alloy polycrystalline thin film is deposited on 3D nickel foam by pulsed laser deposition method serving as a whole binder/carbon-free air electrode, showing great catalytic activity enhancement as an efficient bifunctional catalyst for the oxygen reduction and evolution reactions in lithium oxygen batteries. The porous structure can facilitate rapid O2 and electrolyte diffusion, as well as forming a continuous conductive network throughout the whole energy conversion process. It shows a favorable cycle performance in the full discharge/charge model, owing to the high catalytic activity of the Pt-Gd alloy composite and 3D porous nickel foam structure. Specially, excellent cycling performance …
Light Activated Electrochemistry: Light Intensity And Ph Dependence On Electrochemical Performance Of Anthraquinone Derivatized Silicon, Ying Yang, Simone Ciampi, Moinul H. Choudhury, J Justin Gooding
Light Activated Electrochemistry: Light Intensity And Ph Dependence On Electrochemical Performance Of Anthraquinone Derivatized Silicon, Ying Yang, Simone Ciampi, Moinul H. Choudhury, J Justin Gooding
Australian Institute for Innovative Materials - Papers
We seek to understand how the thermodynamics and kinetics of anthraquinone-containing self-assembled monolayer on silicon electrodes are affected by two key experimental variables: the intensity of the light assisting the anthraquinone/anthrahydroquinone redox process and the local solution environment. The substrates are chemically passivated poorly doped p-type silicon electrodes. The study presents a strategy for the selective modulation of either the anodic or the cathodic process occurring at the interface. Cyclic voltammetry studies showed that unlike for a proton-coupled electron transfer process performed at metallic electrodes, for the redox reaction of the anthraquinone unit on a silicon electrode it becomes possible …
Enhancement Of Dye Regeneration Kinetics In Dichromophoric Porphyrin-Carbazole Triphenylamine Dyes Influenced By More Exposed Radical Cation Orbitals, Long Zhao, Pawel W. Wagner, Jonathan E. Barnsley, Tracey M. Clarke, Keith C. Gordon, Shogo Mori, Attila J. Mozer
Enhancement Of Dye Regeneration Kinetics In Dichromophoric Porphyrin-Carbazole Triphenylamine Dyes Influenced By More Exposed Radical Cation Orbitals, Long Zhao, Pawel W. Wagner, Jonathan E. Barnsley, Tracey M. Clarke, Keith C. Gordon, Shogo Mori, Attila J. Mozer
Australian Institute for Innovative Materials - Papers
Reduction kinetics of oxidized dyes absorbed on semiconductor surfaces and immersed in redox active electrolytes has been mainly modeled based on the free energy difference between the oxidation potential of the dye and the redox potential of the electrolyte. Only a few mechanisms have been demonstrated to enhance the kinetics by other means. In this work, the rate constant of the reduction of oxidized porphyrin dye is enhanced by attaching non-conjugated carbazole triphenylamine moiety using iodine/triiodide and tris(2,2′-bispyridinium)cobalt II/III electrolytes. These results are obtained using transient absorption spectroscopy by selectively probing the regeneration kinetics at the porphyrin radical cation and …
Aqueous Electrosynthesis Of An Electrochromic Material Based Water-Soluble Edot-Menh2 Hydrochloride, Hui Sun, Long Zhang, Liqi Dong, Xiaofei Zhu, Shouli Ming, Youshan Zhang, Huakun Xing, Xuemin Duan, Jingkun Xu
Aqueous Electrosynthesis Of An Electrochromic Material Based Water-Soluble Edot-Menh2 Hydrochloride, Hui Sun, Long Zhang, Liqi Dong, Xiaofei Zhu, Shouli Ming, Youshan Zhang, Huakun Xing, Xuemin Duan, Jingkun Xu
Australian Institute for Innovative Materials - Papers
2'-Aminomethyl-3,4-ethylenedioxythiophene (EDOT-MeNH2) showed unsatisfactory results when its polymerization occurred in organic solvent in our previous report. Therefore, a water-soluble EDOT derivative was designed by using hydrochloric modified EDOT-MeNH2 (EDOT-MeNH2·HCl) and electropolymerized in aqueous solution to form the corresponding polymer with excellent electrochromic properties. Moreover, the polymer was systematically explored, including electrochemical, optical properties and structure characterization. Cyclic voltammetry showed low oxidation potential of EDOT-MeNH2·HCl (0.85 V) in aqueous solution, leading to the facile electrodeposition of uniform the polymer film with outstanding electroactivity. Compared with poly(2′-aminomethyl- 3,4-ethylenedioxythiophene) (PEDOT-MeNH2), poly(2′-aminomethyl-3,4-ethylenedioxythiophene salt) (PEDOT-MeNH3 +A-) revealed higher efficiencies (156 cm2 C-1), lower bandgap (1.68 …
All-In-One Energy Harvesting And Storage Devices, Ju-Hyuck Lee, Jeonghun Kim, Tae Yun Kim, Md Shahriar Hossain, Sang Woo Kim, Jung Ho Kim
All-In-One Energy Harvesting And Storage Devices, Ju-Hyuck Lee, Jeonghun Kim, Tae Yun Kim, Md Shahriar Hossain, Sang Woo Kim, Jung Ho Kim
Australian Institute for Innovative Materials - Papers
Currently, integration of energy harvesting and storage devices is considered to be one of the most important energy-related technologies due to the possibility of replacing batteries or at least extending the lifetime of a battery. This review aims to describe current progress in the various types of energy harvesters, hybrid energy harvesters, including multi-type energy harvesters with coupling of multiple energy sources, and hybridization of energy harvesters and energy storage devices for self-powered electronics. We summarize research on recent energy harvesters based on the piezoelectric, triboelectric, pyroelectric, thermoelectric, and photovoltaic effects. We also cover hybrid cell technologies to simultaneously generate …