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Sodium‐Decorated Amorphous/Crystalline RuO 2 with Rich Oxygen Vacancies: A Robust pH‐Universal Oxygen Evolution Electrocatalyst

Authors :
Jaephil Cho
Xien Liu
Shangguo Liu
Huihui Liu
Lijie Zhang
Haeseong Jang
Dongjiang Yang
Min Gyu Kim
Source :
Angewandte Chemie. 133:18969-18977
Publication Year :
2021
Publisher :
Wiley, 2021.

Abstract

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 RuO 2 with rich oxygen vacancies (a/c-RuO 2 ) was developed as a pH-universal OER electrocatalyst. The a/c-RuO 2 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-RuO 2 also exhibits superior OER activities to commercial RuO 2 and most reported OER catalysts under all pH conditions. Theoretical calculations indicated that the introduction of Na dopant and oxygen vacancy in RuO 2 weakens the adsorption strength of the OER intermediates by engineering the d -band center, thereby lowering the energy barrier for OER.

Details

ISSN :
15213757 and 00448249
Volume :
133
Database :
OpenAIRE
Journal :
Angewandte Chemie
Accession number :
edsair.doi.dedup.....2b35cc0fdbad831b3238ed3418060ccb
Full Text :
https://doi.org/10.1002/ange.202106631