Local tetragonal distortion of Pt alloy catalysts for enhanced oxygen reduction reaction efficiency  

作　　者：Xiaoke Li Xiao Duan Kang Hua Yongkang Wu Zhiyan Rui Rui Ding Aidong Li Chen Ouyang Jia Li Ting Li Jianguo Liu 

机构地区：[1]National Laboratory of Solid-State Microstructures,College of Engineering and Applied Sciences,and Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing,China [2]Long-Life Fuel Cell Key Laboratory in Sichuan Province,Dongfang Electric(Chengdu)Hydrogen Fuel Cell Technology Co.,Ltd.,Chengdu,China [3]Institute of Energy Power Innovation,North China Electric Power University,Beijing,China

出　　处：《Carbon Energy》2024年第7期41-52,共12页碳能源（英文）

基　　金：supported by the National Natural Science Foundation of China (Grant No.22278123).

摘　　要：Platinum-based alloy nanoparticles are the most attractive catalysts for the oxygen reduction reaction at present,but an in-depth understanding of the relationship between their short-range structural information and catalytic performance is still lacking.Herein,we present a synthetic strategy that uses transition-metal oxide-assisted thermal diffusion.PtCo/C catalysts with localized tetragonal distortion were obtained by controlling the thermal diffusion process of transition-metal elements.This localized structural distortion induced a significant strain effect on the nanoparticle surface,which further shortened the length of the Pt-Pt bond,improved the electronic state of the Pt surface,and enhanced the performance of the catalyst.PtCo/C catalysts with special short-range structures achieved excellent mass activity(2.27 Amg_(Pt)^(-1))and specific activity(3.34 A cm^(-2)).In addition,the localized tetragonal distortion-induced surface compression of the Pt skin improved the stability of the catalyst.The mass activity decreased by only 13% after 30,000 cycles.Enhanced catalyst activity and excellent durability have also been demonstrated in the proton exchange membrane fuel cell configuration.This study provides valuable insights into the development of advanced Pt-based nanocatalysts and paves the way for reducing noble-metal loading and increasing the catalytic activity and catalyst stability.

关 键 词：ELECTROCATALYSTS fuel cells local tetragonal distortion oxygen reduction 

分 类 号：O643.36[理学—物理化学]