The Experts below are selected from a list of 85098 Experts worldwide ranked by ideXlab platform
Yitai Qian - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of S/CoS2 Nanoparticles-Embedded N-doped Carbon Polyhedrons from Polyhedrons ZIF-67 and their Properties in Lithium-Sulfur Batteries
Electrochimica Acta, 2016Co-Authors: Jie Zhou, Ning Lin, Wenlong Cai, Cong Guo, Kailong Zhang, Jianbin Zhou, Yongchun Zhu, Yitai QianAbstract:Abstract S/CoS2 nanoparticles-embedded N-doped carbon Polyhedrons (S/CoS2-NC) as the cathode of lithium-sulfur battery are prepared. The synthesis is via the carbonization of metal organic frameworks polyhedron ZIF-67, followed by the heat treatment with sulfur. XRD confirms the existence of CoS2 and S, TEM shows the Polyhedrons morphology and EDX mapping analysis displays the uniform distribution of Co, S and N in the carbon Polyhedrons. As cathode for lithium-sulfur battery, S/CoS2-NC exhibit the enhanced cycling stability with the capacity of 702 mA h g−1 at 0.5C after 250 cycles and rate performance, which is superior to S/Co nanoparticles-embedded N-doped carbon Polyhedrons composites (S/Co-NC), S/N-doped carbon Polyhedrons composites (S-NC) and the bare sulfur. When coupled with the Ge anode, the discharge capacity of 502 mA h g−1 is obtained after 75 cycles at 0.5C. The enhanced property is mainly attributed to the synergistic effects of N-doped carbon Polyhedrons and embedded CoS2.
Zhiliang Jin - One of the best experts on this subject based on the ideXlab platform.
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performance of zif 67 derived fold Polyhedrons for enhanced photocatalytic hydrogen evolution
Chemical Engineering Journal, 2020Co-Authors: Zhiliang Jin, Tiansheng ZhaoAbstract:Abstract Metal-organic framework (MOF) is one of the most promising precursors for the fabrication of advanced photo-semiconductors or cocatalysts due to its diverse structures and unique properties. However, the primitive MOF can not show greater potential and application value. Here Co-ZIF-67 dodecahedron was controllably carved via the different ways for efficiently boosting the photo-catalytic property of hydrogen evolution. This reasonable design can not only preserve polyhedron characteristics with the large specific surface area of ZIF-67, but also improve H2-evolution performance in Eosin Y sensitization system, which depends on the enhanced electronegativity of the surface of ZIF-6 derived Polyhedrons and the quite strong adsorption of H and H2O by Co-site. Meanwhile, ligand group or hetero-atom adjacent to metal Co atom owing to the introduction of electronegative heteroatoms overturns the inherent structure and properties of ZIF-67 to a certain extent thereby rearranging the electron distribution and improving transfer efficiency of charge carriers. Additionally, the structural evolution of ZIF-67 constructs an efficient transport channels for migration of electron, which eliminates the resistance to be overcome when electrons migrate from the inside of a semiconductor to the surface. And the increase of optical absorption density caused by hyperchromicity effect is also a factor that can not be ignored for evolving the co-catalytic performance of ZIF-67.
Tiansheng Zhao - One of the best experts on this subject based on the ideXlab platform.
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performance of zif 67 derived fold Polyhedrons for enhanced photocatalytic hydrogen evolution
Chemical Engineering Journal, 2020Co-Authors: Zhiliang Jin, Tiansheng ZhaoAbstract:Abstract Metal-organic framework (MOF) is one of the most promising precursors for the fabrication of advanced photo-semiconductors or cocatalysts due to its diverse structures and unique properties. However, the primitive MOF can not show greater potential and application value. Here Co-ZIF-67 dodecahedron was controllably carved via the different ways for efficiently boosting the photo-catalytic property of hydrogen evolution. This reasonable design can not only preserve polyhedron characteristics with the large specific surface area of ZIF-67, but also improve H2-evolution performance in Eosin Y sensitization system, which depends on the enhanced electronegativity of the surface of ZIF-6 derived Polyhedrons and the quite strong adsorption of H and H2O by Co-site. Meanwhile, ligand group or hetero-atom adjacent to metal Co atom owing to the introduction of electronegative heteroatoms overturns the inherent structure and properties of ZIF-67 to a certain extent thereby rearranging the electron distribution and improving transfer efficiency of charge carriers. Additionally, the structural evolution of ZIF-67 constructs an efficient transport channels for migration of electron, which eliminates the resistance to be overcome when electrons migrate from the inside of a semiconductor to the surface. And the increase of optical absorption density caused by hyperchromicity effect is also a factor that can not be ignored for evolving the co-catalytic performance of ZIF-67.
Jie Zhou - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of S/CoS2 Nanoparticles-Embedded N-doped Carbon Polyhedrons from Polyhedrons ZIF-67 and their Properties in Lithium-Sulfur Batteries
Electrochimica Acta, 2016Co-Authors: Jie Zhou, Ning Lin, Wenlong Cai, Cong Guo, Kailong Zhang, Jianbin Zhou, Yongchun Zhu, Yitai QianAbstract:Abstract S/CoS2 nanoparticles-embedded N-doped carbon Polyhedrons (S/CoS2-NC) as the cathode of lithium-sulfur battery are prepared. The synthesis is via the carbonization of metal organic frameworks polyhedron ZIF-67, followed by the heat treatment with sulfur. XRD confirms the existence of CoS2 and S, TEM shows the Polyhedrons morphology and EDX mapping analysis displays the uniform distribution of Co, S and N in the carbon Polyhedrons. As cathode for lithium-sulfur battery, S/CoS2-NC exhibit the enhanced cycling stability with the capacity of 702 mA h g−1 at 0.5C after 250 cycles and rate performance, which is superior to S/Co nanoparticles-embedded N-doped carbon Polyhedrons composites (S/Co-NC), S/N-doped carbon Polyhedrons composites (S-NC) and the bare sulfur. When coupled with the Ge anode, the discharge capacity of 502 mA h g−1 is obtained after 75 cycles at 0.5C. The enhanced property is mainly attributed to the synergistic effects of N-doped carbon Polyhedrons and embedded CoS2.
Huannming Chou - One of the best experts on this subject based on the ideXlab platform.
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heat transfer characteristics of an insulated regular polyhedron by using a regular polygon top solid wedge thermal resistance model
Energy Conversion and Management, 2003Co-Authors: Kingleung Wong, Huannming ChouAbstract:The relation of the critical and the neutral thickness and heat transfer characteristics for an insulated regular polyhedron are investigated by using a new regular polygon top solid wedge thermal resistance (RPSWT) model obtained from a solid angle concept. It is found that the dimensionless heat transfer characteristics of the insulated Polyhedrons are the same as those of an insulated sphere even though their actual heat transfer rates are different. It is also found that the conventional constant surface area plate model cannot be used to analyze the insulated Polyhedrons, especially in situations of small to medium body size and/or with a greater insulation thickness. The single RPSWT model should also be applied to the heat transfer problem of the wedge block with a regular polygon top.