Arranging Electronic Localization of PtCu Nanoalloys to Stimulate Improved Oxygen Electroreduction for High-Performance Fuel Cells  

作　　者：Bing Wu Jiayong Xiao Longbin Li Ting Hu Ming Qiu Dirk Lützenkirchen-Hecht Kai Yuan Yiwang Chen 

机构地区：[1]Institute of Polymers and Energy Chemistry,College of Chemistry and Chemical Engineering,Nanchang University,Nanchang 330031 [2]School of Physics and Materials Science,Nanchang University,Nanchang 330031 [3]Central China Normal University,Wuhan 430079 [4]Faculty of Mathematics and Natural Sciences-Physics Department,Bergische Universität Wuppertal,Wuppertal D-42119 [5]National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education,Jiangxi Normal University,Nanchang 330022

出　　处：《CCS Chemistry》2023年第11期2545-2556,共12页中国化学会会刊（英文）

基　　金：support from the National Natural Science Foundation of China(grant nos.52073137,51763018,U20A20246);the Fundamental Research Funds for the Central Universities(Innovation funded Projects,no.2022CXZZ104).

摘　　要：Developing exceptionally durable and efficient oxygen reduction reaction(ORR)catalysts is of paramount importance to the widespread commercialization of proton exchange membrane fuel cells(PEMFCs)but is still challenging.Herein,PtCu nanoalloys rooted on nitrogen-doped carbon nanosheets(PtCuNC-700)with fully exposed PtCu nanoalloys and strong metal–support interaction were developed.Benefiting from its structural and compositional merits,PtCuNC-700 showcases superior ORR activity and stability with a specific activity of 1.05mA cm^(−2)and mass activity of 0.45 A mgPt^(−1),4.2-fold and 3.7-fold higher than Pt/C(0.25 mA cm^(−2)and 0.12 A mgPt^(−1)),respectively.Moreover,PtCuNC-700 exhibits first-class performance in H2/air PEMFC assessment and delivers a peak power density of 929.7 mW cm^(−2)and excellent cycling stability up to 30,000 cycles.Theoretical calculations disclose that the synergistic effect of alloying Pt with Cu combined with the strong interaction between PtCu nanoalloys and nitrogen-doped carbon nanosheets can effectively modify the local electron configuration and density of states of Pt sites approaching the Fermi level.Hence,the PtCu-alloy catalysts realized here diminish the energy barrier for ORR and accelerate their reaction kinetics.This work provides a reliable and effective approach to boost the activity and stability of Pt alloy-based ORR electrocatalysts in PEMFCs.

关 键 词：PtCu nanoalloy strong metal-support interaction stability oxygen reduction reaction fuel cells 

分 类 号：O64[理学—物理化学]