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- Title
Co−Co Dinuclear Active Sites Dispersed on Zirconium‐doped Heterostructured Co<sub>9</sub>S<sub>8</sub>/Co<sub>3</sub>O<sub>4</sub> for High‐current‐density and Durable Acidic Oxygen Evolution.
- Authors
Wang, Ligang; Su, Hui; Zhang, Zhuang; Xin, Junjie; Liu, Hai; Wang, Xiaoge; Yang, Chenyu; Liang, Xiao; Wang, Shunwu; Liu, Huan; Yin, Yanfei; Zhang, Taiyan; Tian, Yang; Li, Yaping; Liu, Qinghua; Sun, Xiaoming; Sun, Junliang; Wang, Dingsheng; Li, Yadong
- Abstract
Developing cost‐effective and sustainable acidic water oxidation catalysts requires significant advances in material design and in‐depth mechanism understanding for proton exchange membrane water electrolysis. Herein, we developed a single atom regulatory strategy to construct Co−Co dinuclear active sites (DASs) catalysts that atomically dispersed zirconium doped Co9S8/Co3O4 heterostructure. The X‐ray absorption fine structure elucidated the incorporation of Zr greatly facilitated the generation of Co−Co DASs layer with stretching of cobalt oxygen bond and S−Co−O heterogeneous grain boundaries interfaces, engineering attractive activity of significantly reduced overpotential of 75 mV at 10 mA cm−2, a breakthrough of 500 mA cm−2 high current density, and water splitting stability of 500 hours in acid, making it one of the best‐performing acid‐stable OER non‐noble metal materials. The optimized catalyst with interatomic Co−Co distance (ca. 2.80 Å) followed oxo‐oxo coupling mechanism that involved obvious oxygen bridges on dinuclear Co sites (1,090 cm−1), confirmed by in situ SR‐FTIR, XAFS and theoretical simulations. Furthermore, a major breakthrough of 120,000 mA g−1 high mass current density using the first reported noble metal‐free cobalt anode catalyst of Co−Co DASs/ZCC in PEM‐WE at 2.14 V was recorded.
- Subjects
HYDROGEN evolution reactions; COBALT catalysts; WATER electrolysis; X-ray absorption; OXIDATION of water; INTERATOMIC distances; OXYGEN reduction
- Publication
Angewandte Chemie, 2023, Vol 135, Issue 49, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202314185