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CoO-modified Co4N as heterostructure electrocatalyst for highly efficient overall water splitting in neutral media

Abstract

A high-performance nonprecious electrocatalyst for oxygen and hydrogen evolution reactions (OER and HER) under mild conditions is highly desirable yet challenging. Transition metal nitrides are emerging as cost-effective substitutes for state-of-the-art noble metal based catalysts, but large OER overpotential is plaguing the nitrides. Herein, we develop the heterostructure of CoO-domain-anchored Co4N nanowhiskers as an effective bifunctional electrocatalyst for both OER and HER in neutral media. Exterior CoO targets OER, and CO4N matrix is active for HER. The periodically-aligned {111} crystalline planes between Co4N and CoO provide well electron transport through their interface. The heterostructure performs dual functions on elevating activity and diminishing interior resistances of catalysts. Moreover, the porous metallic Co4N nanowhiskers are integrated on a nickel foam, which configuration contributes an arterial highway for collecting currents as well as the spacious surface area for increasing reaction cross section of heterocatalysis. These advantages actuate our bifunctional 3D catalytic electrode to achieve low OER and HER overpotentials in neutral systems. It finally documents an unprecedentedly low cell voltage (1.79 V for 10 mA cm-2) for catalyzing overall water splitting in neutral media.

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Publication details

The article was received on 02 Sep 2018, accepted on 09 Nov 2018 and first published on 10 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA08519F
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    CoO-modified Co4N as heterostructure electrocatalyst for highly efficient overall water splitting in neutral media

    R. Li, P. Hu, M. Miao, Y. Li, X. Jiang, Q. Wu, Z. Meng, Z. Hu, Y. Bando and X. WANG, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08519F

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