文献类型：期刊文献

英文题名：Identifying In Situ Activity and Selectivity of Oxygen Reduction Catalysts at the Subparticle Level

作者：Yao, Yufei[1];Qu, Hongyang[1];Sun, Zehui[1];Chen, Yequan[1];Yang, Shenglong[1];Ma, Wei[1]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat & Joint Int Res Lab Precis Chem &, Frontiers Sci Ctr Materiobiol & Dynam Chem, Feringa Nobel Prize Scientist Joint Res Ctr,Sch Ch, Shanghai 200237, Peoples R China

年份：2025

卷号：19

期号：19

起止页码：18502

外文期刊名：ACS NANO

收录：;EI(收录号：20251918381050);WOS:【SCI-EXPANDED(收录号:WOS:001483263200001)】；

基金：This work was supported by the National Natural Science Foundation of China (22272052) and Shanghai Municipal Science and Technology Major Project (2018SHZDZX03). The authors thank the Research Center of Analysis and Test of East China University of Science and Technology for the help on the characterization.

语种：英文

外文关键词：in situ electrochemical mapping; oxygen reduction reaction; activity; selectivity; heterogeneity; subparticle

摘要：Oxygen reduction reaction (ORR) plays a crucial role in both the chemical and energy industries. Despite substantial advancements in theoretical, computational, and experimental studies, identifying both the in situ activity and selectivity in ORR electrocatalysis remains a major challenge. Here, using a suite of correlative operando scanning electrochemical probe and electrochemiluminescence microscopy techniques, we establish a link between the morphological structure and the local ORR activity and selectivity of single Au and Au@Pt platelets at the subparticle level. It is clearly shown that the edge facets of Au and Au@Pt platelets exhibit higher activity for 4e- ORR compared to basal planes, whereas the basal planes of both Au and Au@Pt platelets demonstrate superior 2e- selectivity relative to the edge facets. These findings deepen our understanding of ORR activity and selectivity across different facets at the subparticle level, which offers valuable guidance for the rational design of highly efficient ORR electrocatalysts.