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Fe-doped MoS2nanosheets array for high-current-density seawater electrolysis.

Wei Huang1, Dejin Zhou2, Gaocan Qi3

  • 1State Key Laboratory of ASIC and System, Shanghai Institute of Intelligent Electronics & Systems, School of Microelectronics, Fudan University, Shanghai 200433, People's Republic of China.

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Summary

This study introduces Fe-doped MoS2 nanosheets on carbon fibers as an efficient electrocatalyst for seawater splitting. It achieves high hydrogen evolution reaction (HER) activity and stability, crucial for hydrogen energy development.

Keywords:
H2 productionindustrial-levelneutral hydrogen evolutionseawatertransition metal doping

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Developing efficient electrocatalysts for seawater splitting is critical for sustainable hydrogen energy production.
  • Hydrogen evolution reaction (HER) in seawater faces challenges due to limited catalyst performance and stability.
  • Molybdenum disulfide (MoS2)-based materials show promise but require optimization for seawater applications.

Purpose of the Study:

  • To design and evaluate a novel Fe-doped MoS2 nanosheet array supported by 3D carbon fibers as an electrocatalyst for HER in seawater.
  • To investigate the catalytic activity, efficiency, and stability of the developed electrocatalyst under seawater conditions.
  • To understand the role of Fe doping in enhancing the HER performance of MoS2.

Main Methods:

  • Synthesis of Fe-doped MoS2 nanosheet arrays supported on 3D carbon fibers.
  • Electrochemical characterization of the catalyst for hydrogen evolution reaction (HER) in buffered seawater.
  • Assessment of catalytic stability over extended operation periods (30 hours).
  • Density Functional Theory (DFT) calculations to elucidate the mechanism of Fe doping on MoS2 activity.

Main Results:

  • The Fe-doped MoS2/3D carbon fiber catalyst demonstrated excellent HER activity in buffered seawater.
  • Achieved low overpotentials of 119 mV at 10 mA cm-2 and 300 mV at 250 mA cm-2.
  • Exhibited remarkable stability, maintaining activity for 30 hours without significant degradation.
  • Theoretical calculations confirmed that Fe doping enhances the activity of MoS2 S-edges.

Conclusions:

  • Fe-doped MoS2 nanosheet arrays on 3D carbon fibers represent a highly active and stable electrocatalyst for seawater splitting.
  • The catalyst's performance is comparable to the best reported values under similar conditions.
  • This work offers a promising strategy for developing advanced MoS2-based electrocatalysts for industrial hydrogen production from seawater.