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 language | English |
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Pages (from-to) | 1261-1267 |
Number of pages | 7 |
Journal | Nano Letters |
Volume | 24 |
Issue number | 4 |
DOIs | |
Publication status | Published - 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