Pt Single Atoms Supported on Defect Ceria as an Active and Stable Dual-Site Catalyst for Alkaline Hydrogen Evolution

Vandung Dao, Giovanni Di Liberto, Sunny Yadav, Periyayya Uthirakumar, Kai Chen, Gianfranco Pacchioni, In Hwan Lee

Research output: Contribution to journalArticlepeer-review

Abstract

This work evaluates the feasibility of alkaline hydrogen evolution reaction (HER) using Pt single-atoms (1.0 wt %) on defect-rich ceria (Pt1/CeOx) as an active and stable dual-site catalyst. The catalyst displayed a low overpotential and a small Tafel slope in an alkaline medium. Moreover, Pt1/CeOx presented a high mass activity and excellent durability, competing with those of the commercial Pt/C (20 wt %). In this picture, the defective CeOx is active for water adsorption and dissociation to create H* intermediates, providing the first site where the reaction occurs. The H* intermediate species then migrate to adsorb and react on the Pt2+ isolated atoms, the site where H2 is formed and released. DFT calculations were also performed to obtain mechanistic insight on the Pt1/CeOx catalyst for the HER. The results indicate a new possibility to improve the state-of-the-art alkaline HER catalysts via a combined effect of the O vacancies on the ceria support and Pt2+ single atoms.

Original languageEnglish
Pages (from-to)1261-1267
Number of pages7
JournalNano Letters
Volume24
Issue number4
DOIs
Publication statusPublished - 2024 Jan 31

Bibliographical note

Publisher Copyright:
© 2024 American Chemical Society.

Keywords

  • Pt single-atoms
  • defective ceria
  • dual-site catalyst
  • hydrogen evolution
  • hydrogen spillover effect

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering

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