Sb incorporated into oxides enhances stability in acid during the oxygen evolution reaction by inhibiting structural distortion

Jialu Wang, Hyunchul Kim, Hojin Lee, Young Jin Ko, Man Ho Han, Woong Kim, Jeong Min Baik, Jae Young Choi, Hyung Suk Oh, Woong Hee Lee

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Development of first-row transition-metal-based catalysts for oxygen evolution is a desirable goal due to the low cost and abundance of transition metals, relative to iridium. However, low stability of first-row transition metal catalysts in acidic electrolytes has impeded practical application. In this work, we proposed the role of Sb in metal oxide which enhance electrochemical stability in acid media. While a Co-Fe mixed oxide exhibited poor stability in acid, a FeCoSbOx electrode demonstrate superior stability of over 70 h under the same conditions. In-situ/Operando analysis results suggest that distortion occurred in the FeCoOx electrode under acidic conditions for oxygen evolution, while the structure of the FeCoSbOx electrode was maintained. As compared to an SbOx electrode, Sb in an FeCoSbOx electrode had a higher oxidation state and shorter lattice distance, indicating strong Sb-O bonding. Given the stronger oxide bond, we anticipated that incorporation of Sb would enhance stability in acidic media not only via greater thermodynamic stability but by inhibiting distortion during the reaction. A more stable structure prevents participation by lattice oxygen, resulting in enhanced electrode stability. This demonstration of a stabilizing structural element in a transition metal oxide offers new principles for designing electrocatalysts that are stable in acidic media.

Original languageEnglish
Article number108355
JournalNano Energy
Volume110
DOIs
Publication statusPublished - 2023 Jun 1

Bibliographical note

Funding Information:
This work was supported by institutional program grants from the Korea Institute of Science and Technology and Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry and Energy , Republic of Korea (No. 20224C10300020 ) 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 Research Project for Carbon Upcycling Project for Platform Chemicals of the National Research Foundation (NRF) funded by the Ministry of Science and ICT (Grant no.: 2022M3J3A1050053 ). 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).

Funding Information:
This work was supported by institutional program grants from the Korea Institute of Science and Technology and Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry and Energy, Republic of Korea (No. 20224C10300020) 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 Research Project for Carbon Upcycling Project for Platform Chemicals of the National Research Foundation (NRF) funded by the Ministry of Science and ICT (Grant no.: 2022M3J3A1050053). 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:
© 2023 The Authors

Keywords

  • Acidic conditions
  • Enhanced stability
  • In-situ/Operando studies
  • Oxygen evolution reaction
  • Transition-metal

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Electrical and Electronic Engineering

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