Highly active and durable electrocatalysts towards oxygen reduction reaction(ORR)are imperative for the commercialization application of proton exchange membrane fuel cells.By manipulating ligand effect,structural control,and strain effect,we report here the precise preparation of Mo-doped Pt3Co alloy nanowires(Pt3Co-Mo NWs)as the efficient catalyst towards ORR with high specific activity(0.596 mA cm-2)and mass activity(MA,0.84 A mgPt-1),much higher than those of undoped counterparts.Besides activity,Pt3Co-Mo NWs also demonstrate excellent structural stability and cyclic durability even after 50,000 cycles,again surpassing control samples without Mo dopants.According to the strain maps and DFT calculations,Mo dopants could modify the electronic structure of both Pt and Co to achieve not only optimized oxygen-intermediate binding energy on the interface but also increased the vacancy forma-tion energy of Co,together leading to enhanced activity and durability.This work provides not only a facile methodology but also an in-depth investigation of the relationship between structure and properties to pro-vide general guidance for future design and optimization.

Zhiping Deng;Wanying Pang;Mingxing Gong;Zhehui Jin;Xiaolei Wang

Department of Chemical and Materials Engineering,University of Alberta,Alberta T6G 1H9,Canada;Department of Civil and Environmental Engineering,University of Alberta,Edmonton,Alberta T6G 1H9,Canada;Engineering Research Center of Nano-Geomaterials of Ministry of Education,Faculty of Materials Science and Chemistry,China University of Geosciences,Wuhan 430078,Hubei,China

能源化学

[1]Zhiping Deng;Wanying Pang;Mingxing Gong;Zhehui Jin;Xiaolei Wang-.Revealing the role of mo doping in promoting oxygen reduction reaction performance of Pt3Co nanowires)[J].能源化学,2022(03):16-23

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