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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.
Nanotechnology
|July 6, 2021
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.
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.
