文献类型：期刊文献

英文题名：Tuning strain of Platinum-Cobalt-Zinc trimetallic nanoparticles for efficient oxygen reduction Catalysis

作者：Wang, Weizhi[1];Cai, Yingying[1];Tian, Pengfei[2];Xu, Jing[1];Xuan, Fuzhen[2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China

年份：2025

卷号：698

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：;EI(收录号：20252318561868);WOS:【SCI-EXPANDED(收录号:WOS:001508365000005)】；

基金：This project was supported by the Basic Research Program of Science and Technology Commission of Shanghai Municipality (22JC1400600) , the National Natural Science Foundation of China (22178110 and 52321002) , and the Shanghai Rising-Star Program (23QA1402400) .

语种：英文

外文关键词：Strain effects; Alloy; Platinum; Oxygen reduction reaction; Structure-performance relationship

摘要：Controlling strain in nanomaterials is a key strategy for tuning the mechanics-chemistry interaction and enhance the performance of heterogeneous catalysts. Here, we present a straightforward one-pot synthesis approach for fabricating platinum-cobalt-zinc (PtCoZn) trimetallic catalysts with adjustable Pt strain, enabling exceptional catalytic performance for the oxygen reduction reaction (ORR), comparable to that of state-of-the-art Pt-based alloy catalysts. With increasing the contents of Co and Zn, transmission electron microscope (TEM) reveals that the lattice spacings decreases from 2.26 & Aring; for Pt to 2.19 & Aring; for Pt100Co5Zn75. This indicates that the addition of Zn and Co induces compressive strain in Pt, a finding further corroborated by extended X-ray adsorption fine structure (EXAFS). Pt100Co1Zn25 with a lattice space of 2.23 & Aring; exhibits the optimum performance, achieving a mass activity (MA) of 3.25 A/mgPtand a specific activity (SA) of 7.57 mA/cm2, which are 4.3 times and 7 times higher than those of the commercial Pt/C catalyst, respectively. Moreover, the catalyst demonstrates robust electrochemical durability with negligible activity degradation after 50,000 cycles. The catalytic mechanism is elucidated through in situ electrochemical reflection Fourier transformed infrared (FTIR) and density functional theory (DFT) calculations. The compressive strain in Pt, which weakens the binding strength of oxygen intermediates and enhances ORR activity, is primarily induced by the incorporation of Zn. Meanwhile, Co doping suppresses Zn leaching and improves the stability of PtCoZn by anchoring Zn atoms within the inner layers of the alloy particles. This work sheds new light on developing catalysts through strain engineering in multimetallic systems.