文献类型：期刊文献

英文题名：Molten Salt-Assisted Synthesis of Porous Precious Metal-Based Single-Atom Catalysts for Oxygen Reduction Reaction

作者：Fan, Chenming[1,2];Gao, Xin[1];Tang, Pengyi[2,3];Wang, Qiang[2];Li, Bing[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, Shanghai 200050, Peoples R China;[3]Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, Natl Key Lab Mat Integrated Circuits, Shanghai 200050, Peoples R China

年份：2025

卷号：12

期号：8

外文期刊名：ADVANCED SCIENCE

收录：;EI(收录号：20250117636672);WOS:【SCI-EXPANDED(收录号:WOS:001388336400001)】；

基金：This work was supported by the National Natural Science Foundation of China (52074130, 51774145, and 52204323) and Hundred Talents Program (B) of the Chinese Academy of Sciences (E2XBRD1). C.-M.F. designed the experiments and carried out the synthesis, analysis, and writing. X.G. completed part of the experiments. The project was directed and supervised by P.-Y.T., Q.W., and B.L. All authors contributed to the writing and revisions of the manuscript.

语种：英文

外文关键词：atomically dispersed precious metal; molten salt-assisted pyrolysis; oxygen reduction reaction; porous nitrogen-doped carbon

摘要：Precious metal-based single-atom catalysts (PM-SACs) hosted in N-doped carbon supports have shown new opportunities to revolutionize cathodic oxygen reduction reaction (ORR). However, stabilizing the high density of PM-Nx sites remains a challenge, primarily due to the inherently high free energy of isolated metal atoms, predisposing them to facile atomic agglomeration. Herein, a molten salt-assisted synthesis strategy is proposed to prepare porous PM1/N-CPores (PM = Ru, Pt, and Pd) electrocatalysts with densely accessible PM-Nx sites. A hierarchically porous N-doped carbon substrate (N-CPores), synthesized via the NaCl-assisted pyrolysis of zeolitic imidazolate framework-8, effectively improves the utilization of PM-Nx sites by increased reactants accessible surface area and reduced mass transfer resistance. In accordance with theoretical calculations, the as-prepared Ru1/N-CPores, featuring superior intrinsic active Ru-N4 sites, exhibit outstanding ORR turnover frequency of 6.19 e- site-1 s-1, and outperforms the commercial Pt/C with a 5.3-fold of mass activity (5.83 +/- 0.61 A mg-1) at 0.8 V versus reversible hydrogen electrode. The commendable activity and stability of Ru1/N-CPores in a real fuel cell device further affirm its practical applicability.