文献类型：期刊文献

英文题名：Electrochemical Annealing Tailors PtCu Interlocked Networks Toward the Sabatier Optimum for Stable Oxygen Reduction

作者：Song, Yiting[1];Liu, Heng[2];Xue, Tianrui[1];Mao, Xiaoqing[1];Shen, Yongjun[1];Zhang, Di[2];Cui, Jialin[1];Li, Hao[2];Li, Huihui[1];Li, Chunzhong[1,3]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai, Peoples R China;[2]Tohoku Univ, Adv Inst Mat Res WPI AIMR, Sendai, Japan;[3]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Shanghai, Peoples R China

年份：2026

外文期刊名：ADVANCED FUNCTIONAL MATERIALS

收录：;EI(收录号：20262220780001);WOS:【SCI-EXPANDED(收录号:WOS:001772106500001)】；

基金：This work was supported by the National Natural Science Foundation of China (U22B20143, U24A20546, 22522809, and 22478121), the Shanghai Municipal Science and Technology Major Project, the Fundamental Research Funds for the Central Universities (JKA01261724), JSPS KAKENHI (No. JP24K23069), and Ensemble Grants for Early Career Researchers 2024.

语种：英文

外文关键词：acidic ORR; electrochemical annealing; nanowire networks; Pt-rich surface; stability

摘要：Developing durable Pt-based oxygen reduction reaction electrocatalysts is critical for commercializing proton exchange membrane fuel cells (PEMFCs). However, the conventional catalysts easily suffer from structural collapse and metal dissolution. We rationally design PtCu interlocked nanowire networks that synergistically integrate anisotropic 1D nanostructures with compressive lattice strains. This architecture enhances active site accessibility while weakening oxygen species adsorption. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) reveals the electrochemical annealing-induced spontaneous welding at interwoven junctions during cycling, converting physical contacts into metallic bonds to resist agglomeration. Concurrent surface reconstruction generates a Pt-rich shell that suppresses internal Cu dissolution. The catalyst achieves mass activity (MA) and specific activity (SA) of 1.68 A mgPt -1 and 2.14 mA cm-2 at 0.90 V vs. RHE in 0.1 m HClO4, respectively, and sustains 93.68% MA after 40 000 accelerated durability testing (ADT) cycles. Mechanistic studies confirm electrochemical annealing simultaneously optimizes the adsorption energy of oxygen-containing species on the catalyst surface and stabilizes the lattice framework. This work establishes electrochemical annealing as a transformative design paradigm for ultra-stable strained nanoarchitectures.