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Herein thiourea and sodium dodecyl benzene sulfonate (SDS) were employed as sulfur source and carbon source to modify the pristine carbon black (Ketjen black EC300\u2005J). A highly durable carbon supported Pt nanosized catalyst with higher platinum utilization for oxygen reduction reaction (ORR) in PEMFCs was produced by doping elemental sulfur into carbon supports and decreasing the carbon pore sizes and volume through a successive impregnation technique. The catalyst exhibits an initial activity of 0.167\u2005A mg<jats:sub>Pt<\/jats:sub><jats:sup>\u22121<\/jats:sup> at 0.90\u2005V and demonstrates minimal activity loss after acceleration stress test (30,000 cycles of AST). The half\u2010wave potential loss for representative sample (Pt\/S\u2212C\u20103) is only 14\u2005mV with only 21.8\u2009% ECSA decrease, 27.5\u2009% MA loss and 5.9\u2009% SA loss. A sintering test at various temperature shows a minor average size increase for sulfur\u2010doped carbon (S\u2212C) supported one (from 2.09 to 2.52\u2005nm). In single\u2010cell test, the MEA sample employing the platinum catalyst on modified carbon as cathode exhibited almost negligible performance loss after 30,000 cycles of AST.<\/jats:p>","DOI":"10.1002\/cssc.202301819","type":"journal-article","created":{"date-parts":[[2024,1,30]],"date-time":"2024-01-30T07:43:25Z","timestamp":1706600605000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["A sulfur\u2010modified pore\u2010blocking method to enhance the electrocatalytic stability of carbon\u2010supported platinum nanoparticles"],"prefix":"10.1002","volume":"17","author":[{"given":"Yuhang","family":"Xie","sequence":"first","affiliation":[{"name":"State Key Lab of Oil and Gas Reservoir Geology &amp; Exploitation Southwest Petroleum University  Chengdu 610500 PR China"},{"name":"School of New Energy and Materials Southwest Petroleum University  Chengdu 610500 P.R. 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