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Thermal annealing synthesis of double-shell truncated octahedral pt-ni alloys for oxygen reduction reaction of polymer electrolyte membrane fuel cells

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Frontiers in Energy 2020年第4期14卷 767-777页

作者： Xiashuang LUO Yangge GUO Hongru ZHOU Huan REN Shuiyun SHEN Guanghua WEI Junliang ZHANG Institute of Fuel Cells School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Hydrogen Propulsion Technology Co. LtdShanghai 201804China SJTU-Paris Tech Elite Institute of Technology Shanghai Jiao Tong UniversityShanghai 200240China Institute of Fuel Cells School of Mechanical EngineeringMOE Key Laboratory for Power Machinery and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Shape-controlled pt-ni alloys usually offer an exceptional electrocatalytic activity toward the oxygen reduction reaction(ORR)of polymer electrolyte membrane fuel ceils(PEMFCs),whose tricks lie in welldesigned structures and surface *** this paper,a novel synthesis of truncated octahedral ptni_(3.5) alloy catalysts that consist of homogeneous pt-ni alloy cores enclosed by niO-pt double shells through thermally annealing defective heterogeneous ptni35 alloys is *** tracking the evolution of both compositions and morphologies,the outward segregation of both ptOv and niO are first observed in pt-ni *** is speculated that the diffusion of low-coordination atoms results in the formation of an energetically favorable truncated octahedron while the outward segregation of oxides leads to the formation of niO-pt double *** is very attractive that after gently removing the niO outer shell,the dealloyed truncated octahedral core-shell structure demonstrates a greatly enhanced ORR *** asobtained truncated octahedral pt_(2.1)ni core-shell alloy presents a 3.4-folds mass-specific activity of that for unannealed sample,and its activity preserves 45.4%after 30000 potential cycles of accelerated degradation test(ADT).The peak power density of the dealloyed truncated octahedral pt2jni core-shell alloy catalyst based membrane electrolyte assembly(MEA)reaches 679.8 mW/cm^(2),increased by 138.4 mW/cm^(2) relative to that based on commercial pt/C.

关键词： dealloyed pt-ni alloys truncated octahedron double-shell thermal annealing oxygen reduction reaction(ORR)

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