An exceptionally stable octacobalt-cluster-based metal-organic framework for enhanced water oxidation catalysis

Extensive efforts have been devoted to developing efficient and durable catalysts for water oxidation. Herein, we report a highly stable metal-organic framework that shows high catalytic activity and durability for electrically driven (an overpotential of 430 mV at 10 mA cm −2 in neutral aqueous sol...

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Bibliographic Details
Published in:Chemical science (Cambridge) 2019-11, Vol.1 (42), p.9859-9864
Main Authors: Huang, Ning-Yu, Shen, Jian-Qiang, Ye, Zi-Ming, Zhang, Wei-Xiong, Liao, Pei-Qin, Chen, Xiao-Ming
Format: Article
Language:English
Subjects:
Aqueous solutions
Catalysis
Catalysts
Catalytic activity
Chemistry
Computer simulation
Crystal structure
Crystallography
Durability
Metal-organic frameworks
Oxidation
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Summary:Extensive efforts have been devoted to developing efficient and durable catalysts for water oxidation. Herein, we report a highly stable metal-organic framework that shows high catalytic activity and durability for electrically driven (an overpotential of 430 mV at 10 mA cm −2 in neutral aqueous solution) and photodriven (a turnover frequency of 16 s −1 and 12 000 cycles) water oxidation, representing the best catalyst for water oxidation reported to date. Computational simulation and isotope tracing experiments showed that the μ 4 -OH group of the {Co 8 (μ 4 -OH) 6 } unit participates in the water oxidation reaction to offer an oxygen vacancy site with near-optimal OH − adsorption energy. The site, capping four coplanar cobalt ions, has a near-optimal OH − adsorption energy, which is beneficial to accelerate the reaction kinetics of water oxidation catalysis.
ISSN:2041-6520
2041-6539
DOI:10.1039/c9sc03224j