Stabilizing non-iridium active sites by non-stoichiometric oxide for acidic water oxidation at high current density

Lingxi Zhou, Yangfan Shao, Fang Yin, Jia Li (), Feiyu Kang and Ruitao Lv ()
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Lingxi Zhou: Tsinghua University
Yangfan Shao: Tsinghua University
Fang Yin: Tsinghua University
Jia Li: Tsinghua University
Feiyu Kang: Tsinghua University
Ruitao Lv: Tsinghua University

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-43466-x

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