A corrugated reduced graphene oxide(rGO)-supported Pd composite on carbon paper(Pd/rGO/CP)is prepared via a simple chemical reduction process combined with electrodeposition.The micros tructure,morphology,and surface ...A corrugated reduced graphene oxide(rGO)-supported Pd composite on carbon paper(Pd/rGO/CP)is prepared via a simple chemical reduction process combined with electrodeposition.The micros tructure,morphology,and surface chemical state of the composite and its performance in H_(2)O_(2)reduction in an acidic medium are investigated.An rGO film with ample corrugated wrinkles coated closely on CP is prepared,and Pd nanoparticles are evenly decorated on the surface of rGO/CP.The Pd/rGO/CP electrode has a low Pd loading and high catalytic performance for H_(2)O_(2)reduction in acidic media compared to Pd/CP.An excellent mass normalized activity(11,783 A·g_(Pd)^(-1))of the Pd/rGO/CP electrode for H_(2)O_(2)reduction is achieved at 0 V due to the corresponding low Pd loadings.Mg-H_(2)O_(2)semi-fuel cells using Pd/rGO/CP electrode as the cathode exhibits a peak power density of215 mW·cm^(-2)at 60℃and perfect stability during a 50-h discharge.The rGO interlayer forms a microscopic threedimensional(3 D)structure on the surface of CP,thereby improving the utilization of precious metals and the specific surface area,as well as providing more Pd sites due to the transfer of electrons to Pd.Consequently,the performance of the electrode is improved.展开更多
A novel type of porous magnesium electrode with a stable 3D copper foam as current collectors for the organic magnesium-air battery was prepared by both amperostatic and pulsed electrodeposition of magnesium on copper...A novel type of porous magnesium electrode with a stable 3D copper foam as current collectors for the organic magnesium-air battery was prepared by both amperostatic and pulsed electrodeposition of magnesium on copper foam substrates in an electrolyte of 1 mol/L EtMgBr/THF solution, respectively. Optimal parameters of the pulsed electrodeposition were obtained using a bending cathode at the right angle. The surface morphology of the porous electrode was investigated by SEM, and the discharging performance of the porous magnesium electrode was detected by the chronoamperometric measurement. The electrochemical stability of 3D copper foam current collectors was examined by cyclic voltammetry, SEM and ICP-OES analyses. The results show that the rate capability of the porous magnesium electrode with a stable 3D copper foam as a current collector is better than that of the planar magnesium electrode, and the rate capability of the porous magnesium electrode prepared by the pulsed electrodeposition is superior to that of the porous magnesium electrode prepared by the amperostatic electrodeposition. The 3D structure of copper foam current collectors of the porous magnesium electrode could keep stable during the discharging process.展开更多
基金financially supported by the National Natural Science Foundation of China (No.21463017)the Natural Science Foundation of Inner Mongolia (No.2018BS02005)+3 种基金the Natural Science Foundation of Jiangsu Province (No. BK20171169)the Natural Science Foundation of Jiangsu Higher Education Institutions of China (Nos.19KJA430020 and 21KJA150005)Jiangsu Qing Lan Project (2020)the Opening Foundation of Key Laboratory of Superlight Materials and Surface Technology,Ministry of Education,Harbin Engineering University
文摘A corrugated reduced graphene oxide(rGO)-supported Pd composite on carbon paper(Pd/rGO/CP)is prepared via a simple chemical reduction process combined with electrodeposition.The micros tructure,morphology,and surface chemical state of the composite and its performance in H_(2)O_(2)reduction in an acidic medium are investigated.An rGO film with ample corrugated wrinkles coated closely on CP is prepared,and Pd nanoparticles are evenly decorated on the surface of rGO/CP.The Pd/rGO/CP electrode has a low Pd loading and high catalytic performance for H_(2)O_(2)reduction in acidic media compared to Pd/CP.An excellent mass normalized activity(11,783 A·g_(Pd)^(-1))of the Pd/rGO/CP electrode for H_(2)O_(2)reduction is achieved at 0 V due to the corresponding low Pd loadings.Mg-H_(2)O_(2)semi-fuel cells using Pd/rGO/CP electrode as the cathode exhibits a peak power density of215 mW·cm^(-2)at 60℃and perfect stability during a 50-h discharge.The rGO interlayer forms a microscopic threedimensional(3 D)structure on the surface of CP,thereby improving the utilization of precious metals and the specific surface area,as well as providing more Pd sites due to the transfer of electrons to Pd.Consequently,the performance of the electrode is improved.
基金Project(20973124)supported by the National Natural Science Foundation of ChinaProject supported by Key Laboratory of Superlight Materials and Surface Technology,Ministry of Education(Harbin Engineering University),China
文摘A novel type of porous magnesium electrode with a stable 3D copper foam as current collectors for the organic magnesium-air battery was prepared by both amperostatic and pulsed electrodeposition of magnesium on copper foam substrates in an electrolyte of 1 mol/L EtMgBr/THF solution, respectively. Optimal parameters of the pulsed electrodeposition were obtained using a bending cathode at the right angle. The surface morphology of the porous electrode was investigated by SEM, and the discharging performance of the porous magnesium electrode was detected by the chronoamperometric measurement. The electrochemical stability of 3D copper foam current collectors was examined by cyclic voltammetry, SEM and ICP-OES analyses. The results show that the rate capability of the porous magnesium electrode with a stable 3D copper foam as a current collector is better than that of the planar magnesium electrode, and the rate capability of the porous magnesium electrode prepared by the pulsed electrodeposition is superior to that of the porous magnesium electrode prepared by the amperostatic electrodeposition. The 3D structure of copper foam current collectors of the porous magnesium electrode could keep stable during the discharging process.
基金supported by the National Natural Science Foundation of China(20973048)Key Laboratory of Superlight Material and Surface Technology of Ministry of Education of China+1 种基金Heilongjiang Postdoc Foundation,China(LBH-Q06091)Fund of Harbin Engineering University,China(HEUFT07030,HEUFT07051)~~
基金supported by the National High-Tech Research and Development Program of China (863) (2008AA031205)Graduate Degree Thesis Innovation Foundation of Central South University, China (1343-74334000005)~~
