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Issue 25, 2020
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Boosting water oxidation activity by tuning the proton transfer process of cobalt phosphonates in neutral solution

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Abstract

Water oxidation is a vital step in both natural and artificial photosynthetic processes. However, the effect of second coordination sphere for efficient oxygen evolution electrocatalysts has rarely been studied, becoming a bottleneck in many energy-related issues. In this article, the cobalt phosphonate (NH3C6H4NH3)Co2(hedpH)2·H2O (Co-PDA) displayed decent electrocatalytic water oxidation activity in 50 mM PBS solution (pH 7.0), comparable to the activity of state-of-the-art IrO2. Moreover, it exhibited a 160 mV lower onset potential and 6 times higher TOF than those of the counterpart, (NH4)2Co2(hedpH)2 (Co-NH4+), which existed with the same Co active center, while surrounded by different ligands. The related mechanistic studydemonstrates that the ligand in Co-PDA would benefit the proton-coupled electron transfer (PCET) processes and the formation of high valence state Co(IV).

Graphical abstract: Boosting water oxidation activity by tuning the proton transfer process of cobalt phosphonates in neutral solution

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Supplementary files

Article information


Submitted
24 Apr 2020
Accepted
09 Jun 2020
First published
10 Jun 2020

Phys. Chem. Chem. Phys., 2020,22, 14255-14260
Article type
Paper

Boosting water oxidation activity by tuning the proton transfer process of cobalt phosphonates in neutral solution

J. Lv, X. Guan, M. Yu, X. Li, Y. Yu and D. Chen, Phys. Chem. Chem. Phys., 2020, 22, 14255
DOI: 10.1039/D0CP02194F

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