TY - JOUR
T1 - Observation of subsurface structure of Pt/C catalyst using pair distribution function and simple modeling techniques
AU - Takahashi, Masakuni
AU - Ohara, Koji
AU - Yamamoto, Kentaro
AU - Uchiyama, Tomoki
AU - Tanida, Hajime
AU - Itoh, Takanori
AU - Imai, Hideto
AU - Sugawara, Seiho
AU - Shinohara, Kazuhiko
AU - Uchimoto, Yoshiharu
N1 - Funding Information:
This research is based on results obtained from a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO). The synchrotron radiation experiment was approved by the Japan Synchrotron Radiation Research Institute (proposal Nos. 2016A1021, 2016A1022, 2016A1024, 2016B1010, 2016B1835, 2017A1017, 2017B1041, 2018A1018, and 2018B1027).
Publisher Copyright:
© 2020 The Chemical Society of Japan.
PY - 2020
Y1 - 2020
N2 - The correlation between the PtPt interatomic distance of a Pt/C catalyst and the specific activity of the oxygen reduction reaction is discussed. Total X-ray scattering measurement coupled with pair distribution function (PDF) analysis was performed to obtain subsurface information of the Pt/C catalyst, which can obtain a much longer interatomic distance than X-ray absorption fine structure (XAFS) measurement. The subsurface structure of the catalyst was previously discussed on the basis of simulations with three-dimensional complex models. In this study, the subsurface structure of PtPt bonds in the catalyst could be easily obtained from experimental data by simple model fitting using the PDF. Results based on XAFS measurement showed no correlation with the specific activity. In contrast, the obtained PtPt interatomic distances in the subsurface using PDF showed a strong negative correlation with the specific activity as in a previous study.
AB - The correlation between the PtPt interatomic distance of a Pt/C catalyst and the specific activity of the oxygen reduction reaction is discussed. Total X-ray scattering measurement coupled with pair distribution function (PDF) analysis was performed to obtain subsurface information of the Pt/C catalyst, which can obtain a much longer interatomic distance than X-ray absorption fine structure (XAFS) measurement. The subsurface structure of the catalyst was previously discussed on the basis of simulations with three-dimensional complex models. In this study, the subsurface structure of PtPt bonds in the catalyst could be easily obtained from experimental data by simple model fitting using the PDF. Results based on XAFS measurement showed no correlation with the specific activity. In contrast, the obtained PtPt interatomic distances in the subsurface using PDF showed a strong negative correlation with the specific activity as in a previous study.
KW - Pair distribution function analysis
KW - Polymer electrolyte membrane fuel cell
KW - Pt catalyst for oxygen reduction reaction
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U2 - 10.1246/bcsj.20190256
DO - 10.1246/bcsj.20190256
M3 - Article
AN - SCOPUS:85077849941
SN - 0009-2673
VL - 93
SP - 37
EP - 42
JO - Bulletin of the Chemical Society of Japan
JF - Bulletin of the Chemical Society of Japan
IS - 1
ER -