首页|The degradation of cathodic Fe/N/C catalyst in PEMFCs:The evolution of remanent active sites after demetallation
The degradation of cathodic Fe/N/C catalyst in PEMFCs:The evolution of remanent active sites after demetallation
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The state-of-the-art Fe/N/C catalyst has presented comparable initial cathode performance to the bench-mark Pt/C catalyst in proton exchange membrane fuel cells(PEMFCs).However,the major bottleneck is its significant activity decay in real-world PEMFC cells.The superposed"fast decay"and"slow decay"have been well documented to describe the degradation process of Fe/N/C catalysts during PEMFC operation.The fast decay has been well understood in close relation to the demetallation at the initial 15-h stability test.Nevertheless,it is still unclear how the remanent active sites evolve after demetallation.To this end,the catalyst performance and evolution of a typical Fe/N/C active site were herein investigated through postmortem characterizations of the membrane electrode assemblies(MEAs)after different operations.It is presented that 1 bar pressure and 80 ℃ temperature are the optimized conditions for Fe/N/C MEA.Particularly,the"fast decay"in the initial 15 h is immune to the various operating parameters,while the"slow decay"highly depends on the applied temperature and pressure.According to the X-ray absorp-tion spectra(XAS)analysis and stability test of MEA,the gradual evolution of Fe-N coordination to Fe-O is found correlated with the"slow decay"and accounts for the catalyst decay after the demetallation process.
Xiaohua Yang、Wentao Sun、Jiatang Chen、Yang Gao、Rongxian Zhang、Qun Luo、Tao Lyu、Lei Du
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Institut National de la Recherche Scientifique-Énergie Matériaux et Télécommunications,J3X 1P7 Varennes,QC,Canada
School of Chemistry and Chemical Engineering,Jiangsu University,Zhenjiang 212013,China
State Key Laboratory of Advanced Special Steels & Shanghai Key Laboratory of Advanced Ferrometallurgy,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China
Huangpu Hydrogen Energy Innovation Center,School of Chemistry and Chemical Engineering,Guangzhou University,Guangzhou 510006,China
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Fundamental Research Funds for the Central UniversitiesOutstanding Youth Project of Natural Science Foundation of Guangdong Province
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