Journal
NATURE CATALYSIS
Volume 4, Issue 12, Pages 1012-1023Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41929-021-00703-0
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Funding
- Creative Materials Discovery Program through the National Research Foundation of Korea - Ministry of Science and ICT [2018M3D1A1057844]
- National Natural Science Foundation of China [U1732267, 21972163]
- Fundamental Research Funds for the Central Universities
- DHU Distinguished Young Professor Program
- Development Fund for Shanghai Talents
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- National Key Research and Development Program of China [2018YFA0208600]
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The use of Ru/MnO2 electrocatalyst has shown high activity and outstanding stability for the oxygen evolution reaction, confirming a mechanism involving only *O and *OH intermediates, with excellent overall performance.
The development of acid-stable oxygen evolution reaction electrocatalysts is essential for high-performance water splitting. Here, we report an electrocatalyst with Ru-atom-array patches supported on alpha-MnO2 (Ru/MnO2) for the oxygen evolution reaction following a mechanism that involves only *O and *OH species as intermediates. This mechanism allows direct O-O radical coupling for O-2 evolution. Ru/MnO2 shows high activity (161 mV at 10 mA cm(-2)) and outstanding stability with small degradation after 200 h operation, making it one of the best-performing acid-stable oxygen evolution reaction catalysts. Operando vibrational and mass spectroscopy measurements were performed to probe the reaction intermediates and gaseous products for validating the oxygen evolution reaction pathway. First-principles calculations confirmed the cooperative catalysis mechanism with a reduced energy barrier. Time-dependent elemental analysis demonstrated the occurrence of the in-situ dynamic cation exchange reaction during the oxygen evolution reaction, which is the key for triggering the reconstruction of Ru atoms into the ordered array with high durability.
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