Observation of subsurface structure of Pt/C catalyst using pair distribution function and simple modeling techniques

Masakuni Takahashi, Koji Ohara, Kentaro Yamamoto, Tomoki Uchiyama, Hajime Tanida, Takanori Itoh, Hideto Imai, Seiho Sugawara, Kazuhiko Shinohara, Yoshiharu Uchimoto

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)37-42
Number of pages6
JournalBulletin of the Chemical Society of Japan
Volume93
Issue number1
DOIs
Publication statusPublished - 2020
Externally publishedYes

Keywords

  • Pair distribution function analysis
  • Polymer electrolyte membrane fuel cell
  • Pt catalyst for oxygen reduction reaction

ASJC Scopus subject areas

  • Chemistry(all)

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