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Achieving highly efficient electrocatalytic hydrogen evolution with Co-doped MoS2 nanosheets.

Fengrui Sun1, Kebin Yang1, Xinbo Qin1

  • 1School of Materials Science and Engineering, University of Jinan, Jinan, 250022, Shandong, China. mse_wuwb@ujn.edu.cn.

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Cobalt-doped 1T-molybdenum disulfide (MoS2) nanosheets on carbon cloth demonstrate enhanced hydrogen evolution reaction (HER) catalysis. This doping strategy boosts activity and stability for efficient electrocatalysis.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Molybdenum disulfide (MoS2) shows promise as a hydrogen evolution reaction (HER) catalyst, but its activity is limited by the inert basal plane.
  • The side edges of MoS2 exhibit platinum-like activity, necessitating strategies to enhance basal plane utilization.

Purpose of the Study:

  • To develop highly active and stable molybdenum disulfide (MoS2) catalysts for the hydrogen evolution reaction (HER) through element doping.
  • To investigate the effect of cobalt (Co) doping on the phase transformation and catalytic performance of MoS2 nanosheets.

Main Methods:

  • Hydrothermal synthesis of cobalt-doped 1T-MoS2 nanosheets grown on carbon cloth (CC).
  • Phase transformation analysis using structural tests to confirm the 1T phase content.
  • Electrochemical measurements to evaluate HER activity, including overpotential and Tafel slope.

Main Results:

  • Co-doped 1T-MoS2/CC exhibited superior HER activity with an overpotential of 69 mV at 10 mA cm-2 and a Tafel slope of 81.84 mV dec-1.
  • Co doping induced a phase transformation from 2H to 1T MoS2 (67%), further enhanced by TMA+ addition to 79%.
  • The catalyst demonstrated excellent durability, maintaining performance for over 100 hours at 100 mA cm-2 in an alkaline medium.

Conclusions:

  • Cobalt doping is an effective strategy to enhance the HER activity and stability of MoS2 catalysts by promoting the formation of the active 1T phase.
  • The strong interface binding between MoS2 and CC contributes to the catalyst's excellent durability.
  • This work provides a new approach for designing efficient and robust MoS2-based electrocatalysts via element doping.