@article{576668301dc548398be71ae36d361054,
title = "Structural Kinetics of Cathode Events on Polymer Electrolyte Fuel Cell Catalysts Studied by Operando Time-Resolved XAFS",
abstract = "Abstract: Operando time-resolved X-ray absorption fine structure (XAFS) analysis is promising to investigate the structural kinetics of cathode events on polymer electrolyte fuel cell (PEFC) electrocatalysts. Here we reviewed our recent reports on operando time-resolved XAFS analysis for PEFC cathode catalysts under PEFC operating conditions. Systematic analysis of a series of operando time-resolved XAFS (XANES and EXAFS) spectra showed details of the structural transformations of Pt cathode catalysts (Pt/C, Pt3Co/C, and Pt3Ni/C) in PEFC, and the rate constants of various structural parameters of the Pt cathode catalysts such as electron transfer from/to Pt (oxidative/reductive electron density change of Pt), Pt–O bond formation/breaking, and Pt–Pt bond breaking/reformation of the cathode catalysts were successfully obtained to discuss the mechanisms of the redox processes of the Pt cathode catalysts and the degradation behaviors of the Pt cathode catalysts in PEFC cells. In this paper, we discuss about structural kinetics of the Pt cathode catalysts in PEFC suggested by operando time-resolved XAFS analysis in the viewpoints of the effects of Pt alloying and degradation.",
keywords = "Operando XAFS, Polymer electrolyte fuel cell, Pt electrocatalysts, Structural Kinetics, Time-resolved XAFS",
author = "Nozomu Ishiguro and Mizuki Tada",
note = "Funding Information: Fig. 9 A, C Time profiles of (1) Pt LIII-edge white-line height (×), (2) CN of Pt–Pt (●) Pt–Co (○) bonds, and (3) CN of Pt–O bonds (▲) for the voltage cycling processes of 0.4 V → 1.0 V and 1.0 V → 0.4 V on A Pt/C and C Pt3Co/C, before and after ADT. B, D Profiles of Pt LIII-edge white-line height (1) Pt LIII-edge white-line height changes (∆y0,Pt), (2) CN(Pt-Pt) changes (∆y0,Pt−Pt), and (3) CN(Pt–O) Acknowledgements This work was supported by the New Energy and Industrial Technology Development Organization of the Ministry of Economy, Trade, and Industry, Japan. XAFS measurements were performed at SPring-8 (Nos. 2005A0451, 2010B1014, 2010B1017, 2011A1031, 2011A1033, 2011B1015, 2011B1017, 2012A1013, 2012A1014, 2013A7820, 2013B7820, 2013B7821, 2014A7820, 2014B7820, 2015A7820, 2015B7820). We thank Prof. Y. Iwasawa, Prof. T. Uruga, Dr. O. Sekizawa, Dr. K. Nagasawa at UEC, Dr. H. Matsui and Dr. S. Kityakarn at Nagoya Univ., and Prof. T. Yokoyama and Dr. T. Saida at IMS. Publisher Copyright: {\textcopyright} 2018, Springer Science+Business Media, LLC, part of Springer Nature.",
year = "2018",
month = jun,
day = "1",
doi = "10.1007/s10562-018-2383-7",
language = "English",
volume = "148",
pages = "1597--1609",
journal = "Catalysis Letters",
issn = "1011-372X",
publisher = "Springer Netherlands",
number = "6",
}