Issue 17, 2019

Surface reorganization engineering of the N-doped MoS2 heterostructures MoOx@N-doped MoS2−x by in situ electrochemical oxidation activation for efficient oxygen evolution reaction

Abstract

Extensive experiments have demonstrated that molybdenum disulfide-based catalysts have excellent performance in hydrogen evolution; on the other hand, only few studies have been reported on the application of molybdenum disulfide-based catalysts in the oxygen evolution reaction. Herein, we report that surface reorganization engineering of nitrogen-doped MoS2 by in situ electrochemical oxidation successfully results in its significantly enhanced OER activity. In this study, the construction of the unique heterostructure MoOx@N-doped MoS2−x was performed in situ by electrochemical oxidation; based on the theoretical and experimental results, the electronic characteristics of the catalyst surface were adjusted, whereas the intrinsic properties of N-doped MoS2 were maintained. Due to the moderate amount of MoOx formed on the surface of N-doped MoS2, an optimized performance was achieved: excellent electrocatalytic activity with the very low overpotential of 270 mV at 10 mA cm−2, the small Tafel slope of 61 mV dec−1, and satisfactory stability. Our study provides a viable method to achieve efficient electrocatalysts via non-metal element doping and in situ electrochemical oxidation tuning, which result in the formation of the unique heterostructure of MoOx@N-doped MoS2−xin situ. This new type of core–shell heterostructure opens up a novel avenue for the rational design of high-performance OER electrocatalysts.

Graphical abstract: Surface reorganization engineering of the N-doped MoS2 heterostructures MoOx@N-doped MoS2−x by in situ electrochemical oxidation activation for efficient oxygen evolution reaction

Supplementary files

Article information

Article type
Paper
Submitted
27 Jan 2019
Accepted
26 Mar 2019
First published
26 Mar 2019

J. Mater. Chem. A, 2019,7, 10572-10580

Surface reorganization engineering of the N-doped MoS2 heterostructures MoOx@N-doped MoS2−x by in situ electrochemical oxidation activation for efficient oxygen evolution reaction

Y. Wang, S. LIu, X. Hao, S. Luan, H. You, J. Zhou, D. Song, D. Wang, H. Li and F. Gao, J. Mater. Chem. A, 2019, 7, 10572 DOI: 10.1039/C9TA01049A

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