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2. Promoting effect of MXenes on 1T/2H–MoSe2 for hydrogen evolution.

Author

Shao, Zhitao, Wu, Lili, Ye, Hongfeng, Ma, Xinzhi, Zhang, Xitian, and Li, Lu

Subjects
OXYGEN evolution reactions, HYDROGEN evolution reactions, CATALYTIC activity, CHARGE transfer, TRANSITION metals, HYDROGEN, ELECTROCATALYSTS
Abstract

Cost-effective electrocatalysts are imperative to the large-scale hydrogen evolution reaction. Herein, 1T/2H–MoSe2/Ti3C2 composites are integrated via a hydrothermal method by taking advantage of the tunable phases of MoSe2 and high conductivity of Ti3C2. Consequently, the 1T/2H–MoSe2/Ti3C2 composites exhibit an optimal overpotential of 150 mV at 10 mA cm−2, a low Tafel slope of 90 mV dec−1, and a steady catalytic activity for over 30 h in an alkaline environment. The improved HER performances can be ascribed to the introduction of the Ti3C2 support in a proper proportion, which not only makes the charge transfer process more convenient but also helps the dispersion of MoSe2. Furthermore, the formation of MoSe2/Ti3C2 heterogeneous interfaces and the synergistic effects stemming from the intimate interactions between the individual components ultimately boost the H2O dissociation in the Volmer step. This study indicates that Ti3C2 is an ideal conductive support for improving HER catalytic activity, and paves a new way for other transition metal selenides and MXenes to build highly efficient HER electrocatalysts. [ABSTRACT FROM AUTHOR]

Published
2021
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