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A highly stable CoMo2S4/Ni3S2 heterojunction electrocatalyst for efficient hydrogen evolution.

Minmin Wang1, Mengke Zhang1, Wenwu Song2

  • 1School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, China. wangjin110@ntu.edu.cn stm7314@ntu.edu.cn tangyf@ntu.edu.cn and Nantong Key Laboratory of Intelligent and New Energy Materials, Nantong 226019, China.

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|December 23, 2020
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A novel cobalt molybdenum disulfide/nickel sulfide (CoMo2S4/Ni3S2) heterojunction electrode demonstrates excellent performance for hydrogen evolution reactions. This advanced material offers high stability and efficiency in alkaline solutions.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Efficient electrocatalysts are crucial for energy conversion technologies, particularly for the hydrogen evolution reaction (HER).
  • Developing cost-effective and stable electrode materials for HER in alkaline media remains a significant challenge.

Purpose of the Study:

  • To synthesize and characterize a novel CoMo2S4/Ni3S2 heterojunction for enhanced HER performance.
  • To evaluate the electrocatalytic activity and long-term stability of the CoMo2S4/Ni3S2 electrode in an alkaline environment.

Main Methods:

  • Fabrication of a CoMo2S4/Ni3S2 heterojunction material.
  • Electrochemical characterization using cyclic voltammetry and chronoamperometry in 1 M KOH solution.
  • Assessment of overpotential, current density, and stability.

Main Results:

  • The CoMo2S4/Ni3S2 heterojunction exhibits high charge carrier mobility and numerous active sites.
  • A low overpotential of 51 mV was required to achieve a current density of 10 mA cm-2.
  • The electrode demonstrated exceptional stability, maintaining approximately 100% current density over 50 hours at both 10 mA cm-2 and 240 mA cm-2.

Conclusions:

  • The CoMo2S4/Ni3S2 heterojunction is a highly efficient and stable electrocatalyst for the hydrogen evolution reaction.
  • This material shows great promise for applications in alkaline water electrolysis and other electrochemical energy systems.