Heterostructural Ni-Ni0.2 Mo0.8 N Interface Engineering Boosts Alkaline Hydrogen Electrocatalysis
LuLu An1, Junhao Yang1, Jiang Zhu1
1Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, P. R. China.
Chemsuschem
|April 12, 2023
Summary
Engineered Ni-Ni0.2Mo0.8N nanosheets offer efficient bifunctional catalysis for hydrogen evolution and oxidation reactions. This breakthrough advances unitized regenerative fuel cells by optimizing electrocatalyst performance.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Developing efficient bifunctional catalysts for hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR) is crucial for unitized regenerative fuel cells.
- Low-cost and high-performance electrocatalysts are needed to advance hydrogen electrocatalysis.
Purpose of the Study:
- To present a facile method for preparing hetero-interfacial Ni-Ni0.2Mo0.8N nanosheets with tailored d-band centers.
- To investigate the mechanism of enhanced catalytic activity through interface engineering.
Main Methods:
- Synthesis of Ni-Ni0.2Mo0.8N nanosheets via a facile method.
- Characterization of the material's electronic structure and catalytic properties.
- Electrochemical testing for HER and HOR performance and stability.
Main Results:
- Ni-Ni0.2Mo0.8N nanosheets exhibited a downshifted d-band center due to Ni-to-Ni0.2Mo0.8N electron transfer.
- Achieved a low overpotential of 83 mV at -10 mA cm-2 for HER with good stability over 2,000 cycles.
- Demonstrated a 10.2-fold enhancement in exchange current density for HOR compared to pure Ni.
Conclusions:
- Interface engineering effectively tailors the d-band center of Ni-Ni0.2Mo0.8N, weakening binding strength of intermediates.
- The developed catalyst shows superior bifunctional activity and stability for alkaline hydrogen electrocatalysis.
- Provides insights for designing advanced electrocatalysts by manipulating d-band centers through interface engineering.
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