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- Title
Stabilizing non-iridium active sites by non-stoichiometric oxide for acidic water oxidation at high current density.
- Authors
Zhou, Lingxi; Shao, Yangfan; Yin, Fang; Li, Jia; Kang, Feiyu; Lv, Ruitao
- Abstract
Stabilizing active sites of non-iridium-based oxygen evolution reaction (OER) electrocatalysts is crucial, but remains a big challenge for hydrogen production by acidic water splitting. Here, we report that non-stoichiometric Ti oxides (TiOx) can safeguard the Ru sites through structural-confinement and charge-redistribution, thereby extending the catalyst lifetime in acid by 10 orders of magnitude longer compared to that of the stoichiometric one (Ru/TiO2). By exploiting the redox interaction-engaged strategy, the in situ growth of TiOx on Ti foam and the loading of Ru nanoparticles are realized in one step. The as-synthesized binder-free Ru/TiOx catalyst exhibits low OER overpotentials of 174 and 265 mV at 10 and 500 mA cm−2, respectively. Experimental characterizations and theoretical calculations confirm that TiOx stabilizes the Ru active center, enabling operation at 10 mA cm−2 for over 37 days. This work opens an avenue of using non-stoichiometric compounds as stable and active materials for energy technologies. Developing stable and efficient non-iridium-based acidic oxygen evolution reaction electrocatalysts is crucial but challenging. Here, we report that non-stoichiometric Ti oxides can safeguard the Ru sites through charge-redistribution, thereby enhancing the catalytic performance.
- Subjects
OXIDATION of water; HYDROGEN evolution reactions; NONSTOICHIOMETRIC compounds; ACID catalysts; HYDROGEN production; OXYGEN evolution reactions; OXIDES
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-43466-x