Unraveling the role of introduced W in oxidation tolerance for Pt-based catalysts via on-line inductive coupled plasma-mass spectrometry

Man Ho Han, Young Jin Ko, Byoung Koun Min, Seung Ho Yu, Chang Hyuck Choi, Jae Young Choi, Woong Hee Lee, Hyung Suk Oh

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Water electrolysis cells and fuel cells have attracted considerable attention because they provide renewable and sustainable energy conversion and storage systems. Pt is the best catalyst for these two devices. However, cathodic Pt dissolution can occur after the oxidation of Pt, degrading the Pt catalyst. We report a PtW/C catalyst with high oxidation tolerance under repeated reverse-potential tests. The prepared PtW/C catalyst possesses higher oxidation tolerance than does the commercial Pt/C catalyst under repeated reverse-potential tests while showing comparable catalytic activity. From a combination of on-line inductively coupled plasma-mass spectrometry (ICP-MS) and ex-situ spectroscopy, we suggest that cathodic Pt dissolution is significantly inhibited because the introduced W suppresses the oxidation of Pt in PtW/C. However, W is dissolved in PtW/C rather than in Pt, indicating the need for further research. Our study demonstrates a new perspective for developing Pt-based catalysts with high oxidation tolerance by reducing cathodic Pt dissolution.

Original languageEnglish
Article number107301
JournalElectrochemistry Communications
Volume139
DOIs
Publication statusPublished - 2022 Jun

Bibliographical note

Funding Information:
This work was supported by institutional program grants from the Korea Institute of Science and Technology and “Carbon to X Project” (Project No. 2020M3H7A1098229) through the National Research Foundation (NRF) funded by the Ministry of Science and ICT, Republic of Korea. This research was also supported by the National Research Council of Science & Technology (NST) grant by the Korean government (MSIT) (No. CAP21011-100) and National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (NRF-2021R1A2C2093467). We also acknowledge Advanced Analysis Center at KIST for the TEM and 1D XRS KIST-PAL beamline for measuring the hard X-ray absorption spectroscopy (XAS).

Publisher Copyright:
© 2022 The Author(s)

Keywords

  • In-situ/Operando XAFS
  • On-line ICP-MS
  • Oxidation tolerance
  • Pt dissolution
  • Tungsten

ASJC Scopus subject areas

  • Electrochemistry

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