文献类型：期刊文献

英文题名：Unveiling the Atomic Diffusion Pathway for the In Situ Formation of Size-Controlled Intermetallic Pt on Co-N-C with Exceptional PEMFC Performance

作者：Lu, Wenxuan[1];Wang, Simin[1];Xu, Yuxuan[2];Wang, Xiaoxia[3];Wang, Xijun[4];Zhao, Kun[2];Gao, Yunfei[1];Wang, Fuchen[1]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510650, Peoples R China;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[4]Univ Sci & Technol China, State Key Lab Precis & Intelligent Chem, Hefei 230026, Anhui, Peoples R China

年份：2026

卷号：18

期号：10

起止页码：15156

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20261220298968);WOS:【SCI-EXPANDED(收录号:WOS:001705637500001)】；

基金：The authors gratefully acknowledge Professor. Haiwei Liang from the University of Science and Technology of China for providing kind and constructive suggestions on the research framework and details, and Professor Minghui Zhu from East China University of Science and Technology and Professor Cheng Tang from Tsinghua University for their guidance on the experimental design. Additionally, the authors thank Shanghai AI NEV Innovative Platform Company for their support with PEMFC tests. The project was supported by the National Key Research and Development Program of China (2022YFB4101900) and the National Natural Science Foundation of China (22208104 and 22178114).

语种：英文

外文关键词：PEMFC; size-controlledintermetallic Pt; CoNC; atomic diffusion; in situ formation

摘要：The integration of an intermetallic Pt alloy and single-atom M-N-C support is an intriguing strategy to combine the advantages of both counterparts and further lower Pt usage at higher power output. Despite prior attempts, the fuel cell performance is still unsatisfactory, and the atomic diffusion/alloying pathway between the Pt alloy and M-N-C is still not clear. Here, we control the Co amount in the CoNC and present the atomic-diffusion pathway for the in situ formation of Pt-based intermetallic catalysts with size-controlled nanoparticles (NPs). The synthesized Pt3Fe-Co@5CoNC demonstrates excellent performance in half-cell ORR tests. Under H2-air conditions, the membrane electrode assembly exhibits low Pt usage (0.175 g kW-1), good stability with a 12.5 mV loss at 0.8 A cm-2 at the end of the test, and an ultrahigh power density of 1.717 W cm-2 at 0.429 V. Comprehensive experimental results and DFT calculations show the atomic pathway of diffusion and alloying for low-coordinated Co-N3-C into L12-Pt3Fe NPs. In comparison, high-coordinated Co-N4-C remains stable and contributes to the stability of the intermetallic Pt alloy through the strong Pt-Co-N4 interaction. This work demonstrates important progress in the integration of intermetallic Pt alloy and single-atom CoNC for ORR and can be extended to other single-atom supports, including Ni-NC, Fe-NC, and Cu-NC.