Structural and Electronic Transformations of Pt/C, Pd@Pt(1 ML)/C and Pd@Pt(2 ML)/C Cathode Catalysts in Polymer Electrolyte Fuel Cells during Potential-step Operating Processes Characterized by In-situ Time-resolved XAFS
作者： Shin-ichi Nagamatsu , Shinobu Takao , Gabor Samjeské , Kensaku Nagasawa , Oki Sekizawa
DOI: 10.1016/J.SUSC.2015.10.053
关键词:
摘要: Abstract The dynamic structural and electronic transformations of Pt/C, Pd@Pt(1 ML)/C, Pd@Pt(2 ML)/C cathode catalysts in polymer electrolyte fuel cells (PEFCs) during the potential-step operating processes between 0.4 1.4 VRHE (potential vs RHE) were characterized by in-situ (operando) time-resolved Pt LIII-edge quick-XAFS at 100 ms time-resolution. Potential-dependent surface structures oxidation states Pt, ML) nanoparticles on carbon also analyzed Pd K-edge quick-XAFS. nanoparticle surfaces restructured disordered VRHE, which induced strong Pt-O bonds as well alloying effects. rate constants for changes valence, CN(Pt-Pt), CN(Pt-Pd) CN(Pt-O) (CN: coordination number) determined discussed relation to origin oxygen reduction reaction (ORR) activities catalysts.
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