Transition Metal-Gallium Intermetallic Compounds with Tailored Active Site Configurations for Electrochemical Ammonia
Huaifang Zhang1,2, Chaoqun Ma1,2, Yi-Chi Wang3
1School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
Angewandte Chemie (International Ed. in English)
|September 4, 2024
Summary
Researchers developed a new method to create transition metal-Ga intermetallic compounds (IMCs) for catalysis. Ordered CoGa IMCs on a graphene substrate show excellent performance in nitrate reduction reactions, enabling efficient rechargeable batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Gallium (Ga) serves as a unique metallic solvent for synthesizing intermetallic compounds (IMCs).
- Transition metal-Ga IMCs exhibit high catalytic stability due to negative formation enthalpy and tunable crystal structures for active site engineering.
Purpose of the Study:
- To present a general method for preparing various transition metal-Ga IMCs.
- To investigate the catalytic performance of these IMCs, particularly for nitrate reduction reactions (NO3RR).
- To develop efficient rechargeable Zn-NO3- batteries.
Main Methods:
- Synthesis of transition metal-Ga IMCs (Co-Ga, Ni-Ga, Pt-Ga, Pd-Ga, Rh-Ga).
- Preparation of ordered CoGa IMCs on a nitrogen-doped reduced graphene oxide substrate (O-CoGa/NG).
- Utilizing operando studies and theoretical simulations to understand catalytic mechanisms.
Main Results:
- Successfully prepared a range of transition metal-Ga IMCs.
- O-CoGa/NG demonstrated outstanding NO3RR performance.
- Electron-rich Co atoms enhanced NO3 intermediate adsorption and suppressed hydrogen evolution, improving activity and selectivity.
- Developed efficient rechargeable Zn-NO3- batteries.
Conclusions:
- The developed method provides a versatile route to synthesize transition metal-Ga IMCs for catalysis.
- Ordered CoGa IMCs are highly effective electrocatalysts for NO3RR.
- These findings pave the way for advanced energy storage and conversion technologies.
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