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Engineering the Coordination Geometry of Metal-organic Complex Electrocatalysts for Highly Enhanced Oxygen Evolution Reaction

Abstract

Designing highly efficient oxygen evolution reaction (OER) electrocatalysts is very important for various electrochemical devices. In this work, for the first time, we have successfully generated coordinatively unsaturated metal sites (CUMSs) in the phytic acid-Co2+ (Phy-Co2+) based metal-organic complexes by engineering the coordination geometry with a room-temperature plasma technology. The CUMSs can serve as active centers to catalyze OER. The electron spin resonance and X-ray adsorption spectra provide direct evidence that the coordination geometry is obviously modulated with many CUMSs by the plasma treatment. The plasma treated Phy-Co2+ (P-Phy-Co2+) only requires an overpotential of 306 mV to reach 10 mA cm-2 on glass carbon electrodes. When we expand this strategy to CoFe bimetallic system, it only needs an overpotential of 265 mV to achieve 10 mA cm-2 with a small Tafel slope of 36.51 mV dec-1. The P-Phy-Co2+ is superior to the state-of-the-art. Our findings not only provide alternative excellent OER electrocatalysts, but also introduce a promising principle to design advanced electrocatalysts by creating more CUMSs.

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Publication details

The article was received on 16 Oct 2017, accepted on 05 Dec 2017 and first published on 05 Dec 2017


Article type: Communication
DOI: 10.1039/C7TA09092G
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Engineering the Coordination Geometry of Metal-organic Complex Electrocatalysts for Highly Enhanced Oxygen Evolution Reaction

    D. Yan, C. Dong, Y. Huang, Y. ZOU, C. Xie, Y. Wang, Y. ZHANG, D. Liu, S. SHEN and S. Wang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA09092G

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