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Nano Research

Article Title

Engineering defects and adjusting electronic structure on S doped MoO2 nanosheets toward highly active hydrogen evolution reaction

Keywords

S doping, MoO2, defect, electron structure, charge transfer

Abstract

The electrocatalytic hydrogen evolution reaction (HER) is one of the most promising ways for low-cost hydrogen production in the future. In this work, hetero S atoms were introduced into the MoO2 to enhance the catalytic activity by simultaneously adjusting electron structure, engineering lattice defect, and increasing oxygen vacancies. And the S doped MoO2 nanosheets with proper S doping amount show the enhanced performance for HER. The optimized catalyst shows a small onset overpotential as low as 120 mV, a low overpotential of 176 mV at the current density of 10 mA/cm2 which is decreased 166 mV compared to that of the pristine MoO2 nanosheets, a low Tafel slope of 57 mV/decade, and a high turnover frequency of 0.13 H2/s per active site at 150 mV. This finding proposes an effective strategy to prepare nonprecious metal oxide catalyst for enhancing HER performance by rationally doping hetero atoms.

Graphical Abstract

Publisher

Tsinghua University Press

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