Highly dispersed L1_(2)-Pt_(3)Fe intermetallic particles supported on single atom Fe-N_(x)-C_(y)active sites for enhanced activity and durability towards oxygen reduction

作     者：Tuo Zhao Yang Li Jie Liu Xian Wang Jiayi Zhang Changpeng Liu Wei Xing Junjie Ge Tuo Zhao;Yang Li;Jie Liu;Xian Wang;Jiayi Zhang;Changpeng Liu;Wei Xing;Junjie Ge

作者机构：State Key Laboratory of Electroanalytical ChemistryJilin Province Key Laboratory of Low Carbon Chemical PowerChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and EngineeringUniversity of Science and Technology of ChinaHefei 230026China Fuyuan British American SchoolShenzhen 518126China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2023年第34卷第5期

页      面：343-347页

核心收录：

学科分类：0808[工学-电气工程] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Science and Technology Major Project(No.2017YFB0102900) National Natural Science Foundation of China(Nos.21633008,21673221 and U1601211) Jilin Province Science and Technology Development Program(Nos.20200201001JC,20190201270JC and 20180101030JC) 

主　　题：Intermetallic alloys Single atom active sites ORR Synergistic effect Confinement effect 

摘      要：Highly active and durable oxygen reduction reaction(ORR)catalysts with sufficient activity and stability of Pt are beneficial for the commercialization of proton exchange membrane fuel *** we report an effective approach to prepare a composite catalyst comprising of ordered L1_(2)-Pt_(3)Fe intermetallic nanoparticles interact with single atom Fe-N_(x)-C_(y)active *** addition of Fe and the confinement effect of hierarchical porous structure limit the growth of intermetallic particle size(around2.5 nm).The ligand effect of the electron transfer from Fe to Pt and the synergistic interaction between L1_(2)-Pt_(3)Fe and Fe-N_(x)-C_(y)work together to reduce oxygen intermediates adsorption and improve kinetics ***,the L1_(2)-Pt_(3)Fe/C_(Fe-N-C)catalyst shows high mass activity and specific activity at 1.010 A/mg_(Pt)and 1.166 mA/cm^(2),respectively,which are 5.8 and 5.1 times higher than those of commercial Pt/C(0.174 A/mg_(Pt)and 0.230mA/cm^(2)).Thanks to the more stable L1_(2)structure,L1_(2)-Pt_(3)Fe/C_(Fe-N-C)exhibits better durability(14mV E_(1/2)loss of L1_(2)-Pt_(3)Fe/C_(Fe-N-C)and 33 mV E_(1/2)loss of commercial Pt/C)after 30,000 cycles accelerated stress *** strategy to design and prepare small particle Pt-based intermetallic alloys coordinated with M-N-C active sites provides a new direction to obtain low-cost and easily prepared effective ORR catalysts.