Abstract

Optimizing the activity of layered molybdenum disulfide (MoS2) toward hydrogen evolution reaction (HER) process is generally achieved by improving the electrical transport, intrinsic activity, and/or the number of active sites. However, simultaneously coupling these factors to achieve remarkable MoS2-based electrocatalysts has been seldom reported. Herein, we report a facile approach to the defect-rich one-dimensional MoS2 hierarchical architecture (1D-DRHA MoS2), which synergistically integrate the advantageous structural features of rich defects and one-dimensional hierarchal morphology. Toward HER process, the 1D-DRHA MoS2 electrocatalyst exhibited an overpotential of 119 mV at 10 mA cm−2, a Tafel slope of 50.7 mV dec-1, accompanied by an excellent stability. Notably, the activity is competitive to the state-of-the-art MoS2-based electrocatalysts for HER. The combination of experimental evidences and density functional theory calculations demonstrated the incorporation of rich defects and one-dimensional hierarchical structure improved electric conductivity, intrinsic activity, and active sites, which together accounted for the boosted HER performance.

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