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Sodium‐Decorated Amorphous/Crystalline RuO 2 with Rich Oxygen Vacancies: A Robust pH‐Universal Oxygen Evolution Electrocatalyst
Author(s) -
Zhang Lijie,
Jang Haeseong,
Liu Huihui,
Kim Min Gyu,
Yang Dongjiang,
Liu Shangguo,
Liu Xien,
Cho Jaephil
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202106631
Subject(s) - oxygen evolution , electrocatalyst , overpotential , chemistry , catalysis , inorganic chemistry , oxygen , amorphous solid , electrochemistry , water splitting , chemical engineering , crystallography , organic chemistry , electrode , photocatalysis , engineering
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.