In-situ reconstructed Ru atom array on alpha-MnO2 with enhanced performance for acidic water oxidation
- Authors
- Lin, Chao; Li, Ji-Li; Li, Xiaopeng; Yang, Shuai; Luo, Wei; Zhang, Yaojia; Kim, Sung-Hae; Kim, Dong-Hyung; Shinde, Sambhaji S.; Li, Ye-Fei; Liu, Zhi-Pan; Jiang, Zheng; Lee, Jung-Ho
- Issue Date
- Dec-2021
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- Nature Catalysis, v.4, no.12, pp.1012 - 1023
- Indexed
- SCIE
SCOPUS
- Journal Title
- Nature Catalysis
- Volume
- 4
- Number
- 12
- Start Page
- 1012
- End Page
- 1023
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/108079
- DOI
- 10.1038/s41929-021-00703-0
- ISSN
- 2520-1158
- Abstract
- 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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