Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 34, Pages 18821-18829Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202106631
Keywords
amorphous; defect; heterophase; oxygen evolution reaction; pH-universal conditions
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Funding
- Taishan Scholar Program of Shandong Province, China [ts201712045]
- Doctoral Found of QUST [0100229001]
- China Postdoctoral Science Foundation [2019M662312]
- Postdoctoral Innovation Project of Shandong Province [202003037]
- Qingdao Postdoctoral Application Research Project [04000675]
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The study developed sodium-decorated amorphous/crystalline RuO2 with rich oxygen vacancies as a pH-universal OER electrocatalyst, showing remarkable acid resistance and high catalytic stability. The introduction of Na dopant and oxygen vacancy in RuO2 was found to lower the energy barrier for OER by weakening the adsorption strength of the OER intermediates.
The oxygen evolution reaction (OER) is a key reaction for many electrochemical devices. To date, many OER electrocatalysts function well in alkaline media, but exhibit poor performances in neutral and acidic media, especially the acidic stability. Herein, sodium-decorated amorphous/crystalline RuO2 with rich oxygen vacancies (a/c-RuO2) was developed as a pH-universal OER electrocatalyst. The a/c-RuO2 shows remarkable resistance to acid corrosion and oxidation during OER, which leads to an extremely high catalytic stability, as confirmed by a negligible overpotential increase after continuously catalyzing OER for 60 h at pH=1. Besides, a/c-RuO2 also exhibits superior OER activities to commercial RuO2 and most reported OER catalysts under all pH conditions. Theoretical calculations indicated that the introduction of Na dopant and oxygen vacancy in RuO2 weakens the adsorption strength of the OER intermediates by engineering the d-band center, thereby lowering the energy barrier for OER.
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