The Experts below are selected from a list of 32658 Experts worldwide ranked by ideXlab platform
Tianshou Zhao - One of the best experts on this subject based on the ideXlab platform.
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highly catalytic and stabilized titanium nitride nanowire array decorated graphite felt electrodes for all vanadium redox flow batteries
Journal of Power Sources, 2017Co-Authors: Lei Wei, Tianshou Zhao, Lin Zeng, Yikai Zeng, Haoran JiangAbstract:Abstract In this work, we prepare a highly catalytic and stabilized titanium nitride (TiN) nanowire array-decorated graphite felt electrode for all vanadium redox flow batteries (VRFBs). Free-standing TiN nanowires are synthesized by a two-step process, in which TiO2 nanowires are first grown onto the surface of graphite felt via a seed-assisted hydrothermal method and then converted to TiN through nitridation reaction. When applied to VRFBs, the prepared electrode enables the electrolyte utilization and energy efficiency to be 73.9% and 77.4% at a high current density of 300 mA cm−2, which are correspondingly 43.3% and 15.4% higher than that of battery assembled with a pristine electrode. More impressively, the present battery exhibits good stability and high capacity retention during the cycle test. The superior performance is ascribed to the significant improvement in the Electrochemical Kinetics and enlarged active sites toward V3+/V2+ redox reaction.
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Copper nanoparticle-deposited graphite felt electrodes for all vanadium redox flow batteries
Applied Energy, 2016Co-Authors: Tianshou Zhao, Lin Zeng, Xuelong Zhou, Yikai ZengAbstract:A copper nanoparticle deposited graphite felt electrode for all vanadium redox flow batteries (VRFBs) is developed and tested. It is found that the copper catalyst enables a significant improvement in the Electrochemical Kinetics of the V3+/V2+ redox reaction. The battery’s utilization of the electrolyte and energy efficiency are found to be as high as 83.7% and 80.1%, at a current density of 300mAcm−2, which are 53.1% and 17.8% higher than those of the battery without the catalyst. Moreover, the present battery shows a good stability during the cycle test. The results suggest that the inexpensive copper nanoparticle catalyst without tedious preparation process offers a great promise for VRFB application.
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performance of an alkaline direct ethanol fuel cell with hydrogen peroxide as oxidant
International Journal of Hydrogen Energy, 2014Co-Authors: Liang A, Tianshou Zhao, Li ZengAbstract:An alkaline direct ethanol fuel cell (DEFC) with hydrogen peroxide as the oxidant is developed and tested. The present fuel cell consists of a non-platinum anode, an anion exchange membrane, and a non-platinum cathode. It is demonstrated that the peak power density of the fuel cell is 130 mW cm � 2 at 60 � C (160 mW cm � 2 at 80 � C), which is 44% higher than that of the same fuel cell setup but with oxygen as the oxidant. The improved performance as compared with the fuel cell with oxygen as the oxidant is mainly attributed to the superior Electrochemical Kinetics of the hydrogen peroxide reduction reaction and the reduced ohmic loss associated with the liquid oxidant.
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An alkaline direct ethylene glycol fuel cell with an alkali-doped polybenzimidazole membrane
International Journal of Hydrogen Energy, 2013Co-Authors: Liang An, Lin Zeng, Tianshou ZhaoAbstract:Abstract An alkaline direct ethylene glycol fuel cell (DEGFC) with an alkali-doped polybenzimidazole membrane (APM) is developed and tested. It is demonstrated that the use of APMs enables the present fuel cell to operate at high temperatures. The fuel cell results in the peak power densities of 80 mW cm−2 at 60 °C and 112 mW cm−2 at 90 °C, respectively. The power output at 60 °C is found to be 67% higher than that by DEGFCs with proton exchange membranes, which is mainly attributed to the superior Electrochemical Kinetics of both ethylene glycol oxidation and oxygen reduction reactions in alkaline media.
Gang Chen - One of the best experts on this subject based on the ideXlab platform.
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Electrochemical Kinetics of the li li0 23co0 3mn0 47 o2 cathode material studied by gitt and eis
Journal of Physical Chemistry C, 2010Co-Authors: Zhe Li, Chunzhong Wang, Fei Du, Dong Zhang, Gang ChenAbstract:The Li[Li0.23Co0.3Mn0.47]O2 cathode material was prepared by a sol−gel method. Combinative X-ray diffraction (XRD) and Raman scattering studies showed that the material was a solid solution rather than a composite of nano Li2MnO3 and LiCoO2. The material had a high discharge capacity of 250 mAh g−1 in the voltage window of 2.0−4.8 V. However, the capacity retention was poor. The material showed different Electrochemical mechanisms in the first charge and subsequent cycles. Galvanostatic intermittent titration technique (GITT) study showed that the Li+ diffusion coefficients during the first charge were as small as 10−19 cm2 s−1 because of the high kinetic barriers associated with the concurrent Li+ extraction, oxygen loss, and structural rearrangement. The Li+ diffusion coefficients increased to 10−14 cm2 s−1 after the first charge. However, they were still much smaller than those of typical layered materials such as LiCoO2 and Li(Ni1/3Co1/3Mn1/3)O2. Electrochemical impedance spectroscopy (EIS) study show...
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Electrochemical Kinetics and cycling performance of nano li li0 23co0 3mn0 47 o2 cathode material for lithium ion batteries
Electrochemistry Communications, 2009Co-Authors: Yingjin Wei, Kristian Nikolowski, Helmut Ehrenberg, Chunzhong Wang, S Y Zhan, Steffen Oswald, Gang Chen, H ChenAbstract:Abstract Li[Li 0.23 Co 0.3 Mn 0.47 ]O 2 cathode material was prepared by a sol–gel method. The material had a primary particle size of about 100 nm, covered by a 30 A of Li 2 CO 3 layer. The material showed promising Electrochemical performance when cycled up to 3 C rate. The Electrochemical Kinetics of the first charge was much slower than that of the second charge, due to the complex Electrochemical process which involved not only Li + diffusion but also release of oxygen. By taking account of this, the material was pre-charged very slowly (∼ C /50) in the first cycle. This led to excellent Electrochemical performance in the following cycles. For instance, the 1 C -rate capacity increased to 168 mA h g −1 after 50 cycles, comparing with the 145 mA h g −1 obtained without pre-charging.
Chunzhong Wang - One of the best experts on this subject based on the ideXlab platform.
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relationships between structural changes and Electrochemical Kinetics of li excess li1 13ni0 3mn0 57o2 during the first charge
Journal of Physical Chemistry C, 2013Co-Authors: Yuhui Wang, Xiaofei Bie, Kristian Nikolowski, Helmut Ehrenberg, Manuel Hinterstein, Chunzhong Wang, Gang Gang Chen, Yingjin WeiAbstract:Li-excess cathode material, Li1.13Ni0.3Mn0.57O2, was synthesized by the sol–gel method. The material has a reversible discharge capacity of 200 mAh g–1 at a current density of 40 mA g–1. In situ synchrotron X-ray diffraction, Electrochemical impedance spectroscopy (EIS), and the galvanostatic intermittent titration technique (GITT) were applied to study the relationships between structural changes and Electrochemical Kinetics of Li1.13Ni0.3Mn0.57O2 during the first charge. When the charging potential was below 4.4 V, the c/a structural parameter of the material gradually increased, resulting in a higher layered character. The lithium diffusion coefficients during this process were about 10–14 cm2 s–1. When the charging potential was increased to 4.8 V, the bulk of the material was still maintained in a layered structure with space group symmetry R3m. The lithium diffusion coefficient and the charge transfer Kinetics rapidly decreased because of the high kinetic barriers associated with concurrent Li+ ext...
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Electrochemical Kinetics of the li li0 23co0 3mn0 47 o2 cathode material studied by gitt and eis
Journal of Physical Chemistry C, 2010Co-Authors: Zhe Li, Chunzhong Wang, Fei Du, Dong Zhang, Gang ChenAbstract:The Li[Li0.23Co0.3Mn0.47]O2 cathode material was prepared by a sol−gel method. Combinative X-ray diffraction (XRD) and Raman scattering studies showed that the material was a solid solution rather than a composite of nano Li2MnO3 and LiCoO2. The material had a high discharge capacity of 250 mAh g−1 in the voltage window of 2.0−4.8 V. However, the capacity retention was poor. The material showed different Electrochemical mechanisms in the first charge and subsequent cycles. Galvanostatic intermittent titration technique (GITT) study showed that the Li+ diffusion coefficients during the first charge were as small as 10−19 cm2 s−1 because of the high kinetic barriers associated with the concurrent Li+ extraction, oxygen loss, and structural rearrangement. The Li+ diffusion coefficients increased to 10−14 cm2 s−1 after the first charge. However, they were still much smaller than those of typical layered materials such as LiCoO2 and Li(Ni1/3Co1/3Mn1/3)O2. Electrochemical impedance spectroscopy (EIS) study show...
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Electrochemical Kinetics and cycling performance of nano li li0 23co0 3mn0 47 o2 cathode material for lithium ion batteries
Electrochemistry Communications, 2009Co-Authors: Yingjin Wei, Kristian Nikolowski, Helmut Ehrenberg, Chunzhong Wang, S Y Zhan, Steffen Oswald, Gang Chen, H ChenAbstract:Abstract Li[Li 0.23 Co 0.3 Mn 0.47 ]O 2 cathode material was prepared by a sol–gel method. The material had a primary particle size of about 100 nm, covered by a 30 A of Li 2 CO 3 layer. The material showed promising Electrochemical performance when cycled up to 3 C rate. The Electrochemical Kinetics of the first charge was much slower than that of the second charge, due to the complex Electrochemical process which involved not only Li + diffusion but also release of oxygen. By taking account of this, the material was pre-charged very slowly (∼ C /50) in the first cycle. This led to excellent Electrochemical performance in the following cycles. For instance, the 1 C -rate capacity increased to 168 mA h g −1 after 50 cycles, comparing with the 145 mA h g −1 obtained without pre-charging.
Yingjin Wei - One of the best experts on this subject based on the ideXlab platform.
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relationships between structural changes and Electrochemical Kinetics of li excess li1 13ni0 3mn0 57o2 during the first charge
Journal of Physical Chemistry C, 2013Co-Authors: Yuhui Wang, Xiaofei Bie, Kristian Nikolowski, Helmut Ehrenberg, Manuel Hinterstein, Chunzhong Wang, Gang Gang Chen, Yingjin WeiAbstract:Li-excess cathode material, Li1.13Ni0.3Mn0.57O2, was synthesized by the sol–gel method. The material has a reversible discharge capacity of 200 mAh g–1 at a current density of 40 mA g–1. In situ synchrotron X-ray diffraction, Electrochemical impedance spectroscopy (EIS), and the galvanostatic intermittent titration technique (GITT) were applied to study the relationships between structural changes and Electrochemical Kinetics of Li1.13Ni0.3Mn0.57O2 during the first charge. When the charging potential was below 4.4 V, the c/a structural parameter of the material gradually increased, resulting in a higher layered character. The lithium diffusion coefficients during this process were about 10–14 cm2 s–1. When the charging potential was increased to 4.8 V, the bulk of the material was still maintained in a layered structure with space group symmetry R3m. The lithium diffusion coefficient and the charge transfer Kinetics rapidly decreased because of the high kinetic barriers associated with concurrent Li+ ext...
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Electrochemical Kinetics and cycling performance of nano li li0 23co0 3mn0 47 o2 cathode material for lithium ion batteries
Electrochemistry Communications, 2009Co-Authors: Yingjin Wei, Kristian Nikolowski, Helmut Ehrenberg, Chunzhong Wang, S Y Zhan, Steffen Oswald, Gang Chen, H ChenAbstract:Abstract Li[Li 0.23 Co 0.3 Mn 0.47 ]O 2 cathode material was prepared by a sol–gel method. The material had a primary particle size of about 100 nm, covered by a 30 A of Li 2 CO 3 layer. The material showed promising Electrochemical performance when cycled up to 3 C rate. The Electrochemical Kinetics of the first charge was much slower than that of the second charge, due to the complex Electrochemical process which involved not only Li + diffusion but also release of oxygen. By taking account of this, the material was pre-charged very slowly (∼ C /50) in the first cycle. This led to excellent Electrochemical performance in the following cycles. For instance, the 1 C -rate capacity increased to 168 mA h g −1 after 50 cycles, comparing with the 145 mA h g −1 obtained without pre-charging.
Lin Zeng - One of the best experts on this subject based on the ideXlab platform.
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highly catalytic and stabilized titanium nitride nanowire array decorated graphite felt electrodes for all vanadium redox flow batteries
Journal of Power Sources, 2017Co-Authors: Lei Wei, Tianshou Zhao, Lin Zeng, Yikai Zeng, Haoran JiangAbstract:Abstract In this work, we prepare a highly catalytic and stabilized titanium nitride (TiN) nanowire array-decorated graphite felt electrode for all vanadium redox flow batteries (VRFBs). Free-standing TiN nanowires are synthesized by a two-step process, in which TiO2 nanowires are first grown onto the surface of graphite felt via a seed-assisted hydrothermal method and then converted to TiN through nitridation reaction. When applied to VRFBs, the prepared electrode enables the electrolyte utilization and energy efficiency to be 73.9% and 77.4% at a high current density of 300 mA cm−2, which are correspondingly 43.3% and 15.4% higher than that of battery assembled with a pristine electrode. More impressively, the present battery exhibits good stability and high capacity retention during the cycle test. The superior performance is ascribed to the significant improvement in the Electrochemical Kinetics and enlarged active sites toward V3+/V2+ redox reaction.
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Copper nanoparticle-deposited graphite felt electrodes for all vanadium redox flow batteries
Applied Energy, 2016Co-Authors: Tianshou Zhao, Lin Zeng, Xuelong Zhou, Yikai ZengAbstract:A copper nanoparticle deposited graphite felt electrode for all vanadium redox flow batteries (VRFBs) is developed and tested. It is found that the copper catalyst enables a significant improvement in the Electrochemical Kinetics of the V3+/V2+ redox reaction. The battery’s utilization of the electrolyte and energy efficiency are found to be as high as 83.7% and 80.1%, at a current density of 300mAcm−2, which are 53.1% and 17.8% higher than those of the battery without the catalyst. Moreover, the present battery shows a good stability during the cycle test. The results suggest that the inexpensive copper nanoparticle catalyst without tedious preparation process offers a great promise for VRFB application.
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An alkaline direct ethylene glycol fuel cell with an alkali-doped polybenzimidazole membrane
International Journal of Hydrogen Energy, 2013Co-Authors: Liang An, Lin Zeng, Tianshou ZhaoAbstract:Abstract An alkaline direct ethylene glycol fuel cell (DEGFC) with an alkali-doped polybenzimidazole membrane (APM) is developed and tested. It is demonstrated that the use of APMs enables the present fuel cell to operate at high temperatures. The fuel cell results in the peak power densities of 80 mW cm−2 at 60 °C and 112 mW cm−2 at 90 °C, respectively. The power output at 60 °C is found to be 67% higher than that by DEGFCs with proton exchange membranes, which is mainly attributed to the superior Electrochemical Kinetics of both ethylene glycol oxidation and oxygen reduction reactions in alkaline media.