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Dual-Site Substitution With Single Te Atoms in MoS2 Boosting Hydrogen Evolution
Guomin Li1,2, Meihan Xia2,3, Yunlong Zhang2,3
1State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China.
None:
Heteroatom substitution is a promising strategy to enhance hydrogen evolution reaction (HER) activity of MoS2, yet synergistically activating both its basal plane and edge sites remains challenging. Herein, we report a dual-site substitution of both Mo and S with tellurium in the MoS2 lattice (Te-MoS2), which achieves a superior large-current-density HER performance in acidic electrolyte, surpassing all previously reported single-element-doped MoS2 with nonmetal or non-precious metal. The Te-MoS2 catalyst requires an overpotential of only 364 mV to achieve an industrial-level current density of 1000 mA·cm-2, significantly lower than 506 mV required by commercial 20 wt% Pt/C, and maintains this performance stably for 200 h without decay. Comprehensive analyses reveal that the simultaneous substitution of Mo and S with Te atoms activates neighboring S atoms and also promotes the formation of smaller, edge-rich MoS2 nanosheets, thereby generating abundant basal plane and edge S active sites with optimized hydrogen adsorption energy.
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