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

    8 Citations (Scopus)

    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

    Fingerprint

    Dive into the research topics of 'Pt Single Atoms Supported on Defect Ceria as an Active and Stable Dual-Site Catalyst for Alkaline Hydrogen Evolution'. Together they form a unique fingerprint.

    Cite this