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Efficient Hydrogen and Oxygen Evolution Catalysis Using 3D-Structured Nickel Phosphosulfide Nanosheets in Alkaline
Lei Lin1, Qiang Fu1, Junbei Hu1
1Harbin Institute of Technology, School of Physics, Harbin 150001, China.
Molecules (Basel, Switzerland)
|January 8, 2023
Summary
Researchers developed a novel nickel phosphosulfide nanosheet electrocatalyst for efficient water splitting. Argon etching enhanced its performance for both hydrogen and oxygen evolution reactions, showing promise for renewable energy systems.
Area of Science:
- Materials Science
- Electrochemistry
- Renewable Energy
Background:
- Water electrolysis is a key technology for generating green hydrogen and oxygen.
- Developing efficient and cost-effective electrocatalysts is crucial for advancing water splitting technologies.
- Nickel phosphosulfide (NiPS3) materials show potential as electrocatalysts but require optimization.
Purpose of the Study:
- To fabricate and optimize a self-supported nickel phosphosulfide nanosheet electrocatalyst for overall water splitting.
- To investigate the effect of argon (Ar) etching on the catalytic activity of NiPS3 nanosheets.
- To evaluate the electrocatalytic performance for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media.
Main Methods:
- Fabrication of self-supported nickel phosphosulfide nanosheets on carbon cloth at low temperature.
- Enhancement of catalytic activity via argon (Ar) plasma etching.
- Electrochemical characterization including overpotential measurements for HER and OER.
- Material characterization using techniques to confirm structural and electronic changes.
Main Results:
- Ar etching created a thin amorphous layer on NiPS3 nanosheets, increasing active sites and modulating electronic structure.
- The etched NiPS3 nanosheets exhibited improved HER performance with an overpotential of 103.1 mV at 10 mA cm⁻².
- The etched NiPS3 nanosheets demonstrated enhanced OER performance with an overpotential of 278.9 mV at 50 mA cm⁻².
- The 3D-structured NiPS3 nanosheets showed promising catalytic activity for overall water splitting.
Conclusions:
- Argon etching is an effective method to enhance the electrocatalytic activity of nickel phosphosulfide nanosheets for water splitting.
- The optimized NiPS3 nanosheets offer a promising pathway for efficient and durable electrocatalysts in alkaline water electrolysis.
- This approach holds potential for scalable applications in renewable energy conversion systems.
Keywords:
Ni-based nanomaterialshydrogen evolution reactionoxygen evolution reactionplasma surface treatmentvacancy defectwater splittingMore Related Videos
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