Journal
JOURNAL OF ENERGY CHEMISTRY
Volume 65, Issue -, Pages 505-513Publisher
ELSEVIER
DOI: 10.1016/j.jechem.2021.06.019
Keywords
Metal-organic framework; Structural transformation; Electrocatalyst; Water splitting
Funding
- National Key Research and Development Program of China [2017YFA0206700, 2017YFA0402802]
- National Natural Science Foundation of China [21776265, 51902304]
- Anhui Provincial Natural Science Foundation [1908085ME122]
- Fundamental Research Funds for the Central Universities [Wk2060140026]
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Metal-organic frameworks (MOFs) are widely studied for water oxidation electrocatalysis due to their tunable structure, with a recent study focusing on a facile approach to optimize the structural transformation process of Co-based zeolitic imidazolate frameworks during the oxygen evolution reaction.
Metal-organic frameworks (MOFs) have been widely studied as efficient electrocatalysts for water oxidation due to their tunable structure and easy preparation. However, the rational design of MOFs-based electrocatalysts and fundamental understanding of their structural evolution during oxygen evolution reaction (OER) remain critical challenges. Here, we report a facile approach to tune the structural transformation process of the Co-based zeolitic imidazolate framework (ZIF) during the OER process by using water molecules as a vacancy promoter. The modified ZIF catalyst accelerates the structural transformation from MOF precursor to electrochemical active species and simultaneously enhances the vacancy density during the electrochemical activation process. The optimized electrocatalyst exhibits an extremely low overpotential 175 mV to deliver 10 mA cm(-2) and superior durability (100 h) at 100 mA cm(-2). The comprehensive characterization results reveal the structural transformation from the initial tetrahedral Co sites to cobalt oxyhydroxide (CoOOH) and the formation process of oxygen vacancies (CoOOH-VO) at a high anodic potential. These findings represent a promising way to achieve highly active MOF-based electrocatalysts for water oxidation. (C) 2021 Published by ELSEVIER B.V. and Science Press on behalf of Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences.
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