文献类型：期刊文献

英文题名：Well-Defined PtCo@Pt Core-Shell Nanodendrite Electrocatalyst for Highly Durable Oxygen Reduction Reaction

作者：Yin, Shixin[1];Song, Yiting[1];Liu, Heng[2];Cui, Jialin[1];Liu, Zhongliang[1];Li, Yu[1];Xue, Tianrui[1];Tang, Weizheng[1];Zhang, Di[2];Li, Hao[2];Li, Huihui[1];Li, Chunzhong[1,3]

机构：[1]East China Univ Sci & Technol, Minist Educ, Sch Chem Engn, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]Tohoku Univ, Adv Inst Mat Res WPI AIMR, Sendai 9808577, Japan;[3]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Engn Res Ctr Hierarch Nanomat, Shanghai 200237, Peoples R China

年份：2025

卷号：21

期号：8

外文期刊名：SMALL

收录：;EI(收录号：20250317677789);WOS:【SCI-EXPANDED(收录号:WOS:001391829600001)】；

基金：S.Y., Y.S., and H.L. contributed equally to this work. This work was supported by the National Natural Science Foundation of China (Grants U22B20143, 22478121), Shanghai Municipal Science and Technology Major Project, the Science and Technology Commission of Shanghai Municipality (22dz1205900), the Fundamental Research Funds for the Central Universities (JKD01241702), JSPS KAKENHI (No.JP24K23069, JP24K23068), Ensemble Grants for Early Career Researchers 2024. The authors acknowledged the Center for Computational Materials Science, Institute for Materials Research, Tohoku University for the use of MASAMUNE-IMR (No. 202312-SCKXX-0203 and 202312-SCKXX-0207) and the Institute for Solid State Physics (ISSP) at the University of Tokyo for the use of their supercomputers.

语种：英文

外文关键词：acidic ORR; dendritic structure; Pt-rich surface; stability; structural evolution

摘要：The rational design of efficient electrocatalysts with controllable structure and composition is crucial for enhancing the lifetime and cost-effectiveness of oxygen reduction reaction (ORR). PtCo nanocrystals have gained attention due to their exceptional activity, yet suffer from stability issues in acidic media. Herein, an active and highly stable electrocatalyst is developed, namely 3D Pt7Co3@Pt core-shell nanodendrites (NDs), which are formed through the self-assembly of small Pt nanoparticles (approximate to 6 nm). This unique structure significantly improves the ORR with an enhanced mass activity (MA) of 0.54 A mgPt-1, surpassing that of the commercial Pt/C (com-Pt/C) catalyst by three fold (0.17 A mgPt-1). The well-organized dendritic morphology, along with the Pt-rich shell, contributes significantly to the observed high catalytic activity and superior stability for acidic ORR, which exhibit a loss of 2.1% in MA and, impressively, an increase of 12.0% in specific activity (SA) after an accelerated durability test (ADT) of 40,000 potential-scanning cycles. This work offers insights for improving the design of highly stable Pt-based electrocatalysts for acidic ORR.