Structural kinetics of a Pt/C cathode catalyst with practical catalyst loading in an MEA for PEFC operating conditions studied by in situ time-resolved XAFS

Nozomu Ishiguro; Takahiro Saida; Tomoya Uruga; Oki Sekizawa; Kensaku Nagasawa; Kiyofumi Nitta; Takashi Yamamoto; Shin Ichi Ohkoshi; Toshihiko Yokoyama; Mizuki Tada

doi:10.1039/c3cp52578c

Structural kinetics of a Pt/C cathode catalyst with practical catalyst loading in an MEA for PEFC operating conditions studied by in situ time-resolved XAFS

Nozomu Ishiguro, Takahiro Saida, Tomoya Uruga, Oki Sekizawa, Kensaku Nagasawa, Kiyofumi Nitta, Takashi Yamamoto, Shin Ichi Ohkoshi, Toshihiko Yokoyama, Mizuki Tada

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Abstract

The structural kinetics of surface events on a Pt/C cathode catalyst in a membrane electrode assembly (MEA) with a practical catalyst loading (0.5 mg _Pt cm^-2) for a polymer electrolyte fuel cell were investigated by in situ time-resolved X-ray absorption fine structure analysis (XAFS; time resolution: 100 ms) for the first time. The rate constants of structural changes in the Pt/C cathode catalyst in the MEA during voltage cycling were successfully estimated. For voltage-cycling processes, all reactions (electrochemical reactions and structural changes in the Pt catalyst) in the MEA were found to be much faster than those in an MEA with a thick cathode catalyst layer, but the in situ time-resolved XAFS analysis revealed that significant time lags similarly existed between the electrochemical reactions and the structural changes in the Pt cathode catalyst. The time-resolved XAFS also revealed differences in the structural kinetics of the Pt/C cathode catalyst for the voltage-cycling processes under N₂ and air flows at the cathode.

Original language	English
Pages (from-to)	18827-18834
Number of pages	8
Journal	Physical Chemistry Chemical Physics
Volume	15
Issue number	43
DOIs	https://doi.org/10.1039/c3cp52578c
Publication status	Published - 2013 Nov 21
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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Ishiguro, N., Saida, T., Uruga, T., Sekizawa, O., Nagasawa, K., Nitta, K., Yamamoto, T., Ohkoshi, S. I., Yokoyama, T., & Tada, M. (2013). Structural kinetics of a Pt/C cathode catalyst with practical catalyst loading in an MEA for PEFC operating conditions studied by in situ time-resolved XAFS. Physical Chemistry Chemical Physics, 15(43), 18827-18834. https://doi.org/10.1039/c3cp52578c

Ishiguro, N, Saida, T, Uruga, T, Sekizawa, O, Nagasawa, K, Nitta, K, Yamamoto, T, Ohkoshi, SI, Yokoyama, T & Tada, M 2013, 'Structural kinetics of a Pt/C cathode catalyst with practical catalyst loading in an MEA for PEFC operating conditions studied by in situ time-resolved XAFS', Physical Chemistry Chemical Physics, vol. 15, no. 43, pp. 18827-18834. https://doi.org/10.1039/c3cp52578c

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abstract = "The structural kinetics of surface events on a Pt/C cathode catalyst in a membrane electrode assembly (MEA) with a practical catalyst loading (0.5 mg Pt cm-2) for a polymer electrolyte fuel cell were investigated by in situ time-resolved X-ray absorption fine structure analysis (XAFS; time resolution: 100 ms) for the first time. The rate constants of structural changes in the Pt/C cathode catalyst in the MEA during voltage cycling were successfully estimated. For voltage-cycling processes, all reactions (electrochemical reactions and structural changes in the Pt catalyst) in the MEA were found to be much faster than those in an MEA with a thick cathode catalyst layer, but the in situ time-resolved XAFS analysis revealed that significant time lags similarly existed between the electrochemical reactions and the structural changes in the Pt cathode catalyst. The time-resolved XAFS also revealed differences in the structural kinetics of the Pt/C cathode catalyst for the voltage-cycling processes under N2 and air flows at the cathode.",

author = "Nozomu Ishiguro and Takahiro Saida and Tomoya Uruga and Oki Sekizawa and Kensaku Nagasawa and Kiyofumi Nitta and Takashi Yamamoto and Ohkoshi, {Shin Ichi} and Toshihiko Yokoyama and Mizuki Tada",

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AU - Ishiguro, Nozomu

AU - Saida, Takahiro

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AU - Sekizawa, Oki

AU - Nagasawa, Kensaku

AU - Nitta, Kiyofumi

AU - Yamamoto, Takashi

AU - Ohkoshi, Shin Ichi

AU - Yokoyama, Toshihiko

AU - Tada, Mizuki

PY - 2013/11/21

Y1 - 2013/11/21

N2 - The structural kinetics of surface events on a Pt/C cathode catalyst in a membrane electrode assembly (MEA) with a practical catalyst loading (0.5 mg Pt cm-2) for a polymer electrolyte fuel cell were investigated by in situ time-resolved X-ray absorption fine structure analysis (XAFS; time resolution: 100 ms) for the first time. The rate constants of structural changes in the Pt/C cathode catalyst in the MEA during voltage cycling were successfully estimated. For voltage-cycling processes, all reactions (electrochemical reactions and structural changes in the Pt catalyst) in the MEA were found to be much faster than those in an MEA with a thick cathode catalyst layer, but the in situ time-resolved XAFS analysis revealed that significant time lags similarly existed between the electrochemical reactions and the structural changes in the Pt cathode catalyst. The time-resolved XAFS also revealed differences in the structural kinetics of the Pt/C cathode catalyst for the voltage-cycling processes under N2 and air flows at the cathode.

AB - The structural kinetics of surface events on a Pt/C cathode catalyst in a membrane electrode assembly (MEA) with a practical catalyst loading (0.5 mg Pt cm-2) for a polymer electrolyte fuel cell were investigated by in situ time-resolved X-ray absorption fine structure analysis (XAFS; time resolution: 100 ms) for the first time. The rate constants of structural changes in the Pt/C cathode catalyst in the MEA during voltage cycling were successfully estimated. For voltage-cycling processes, all reactions (electrochemical reactions and structural changes in the Pt catalyst) in the MEA were found to be much faster than those in an MEA with a thick cathode catalyst layer, but the in situ time-resolved XAFS analysis revealed that significant time lags similarly existed between the electrochemical reactions and the structural changes in the Pt cathode catalyst. The time-resolved XAFS also revealed differences in the structural kinetics of the Pt/C cathode catalyst for the voltage-cycling processes under N2 and air flows at the cathode.

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Structural kinetics of a Pt/C cathode catalyst with practical catalyst loading in an MEA for PEFC operating conditions studied by in situ time-resolved XAFS

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