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Published on: July 24, 2021
In situ construction of ZnP2/CuP2 heterojunction for efficient nitrate-to-ammonia electroreduction
Huihui Zhu1, Jun Ma2, Shuaishuai Zhang2
1Universities' Key laboratory of functional materials for production, storage and utilization of industrial by-product hydrogen in Jiangsu, School of Material and Chemical Engineering, Xuzhou University of Technology, Xuzhou 221018, China. zwyou@xzit.edu.cn.
A novel ZnP2/CuP2 composite catalyst enhances nitrate reduction to ammonia via synergistic effects at heterointerfaces. This catalyst achieves high ammonia yield and excellent Faraday efficiency, offering a promising pathway for ammonia synthesis.
Area of Science:
- Materials Science
- Catalysis
- Electrochemistry
Background:
- Nitrate (NO3-) contamination is a significant environmental concern.
- Ammonia (NH3) is a crucial chemical feedstock and potential clean energy carrier.
- Efficient and selective electrochemical reduction of nitrate to ammonia is highly desirable.
Purpose of the Study:
- To develop a composite catalyst for enhanced electrochemical nitrate reduction to ammonia.
- To investigate the synergistic effects and interfacial electronic interactions in the composite catalyst.
- To optimize catalyst composition for high ammonia yield and selectivity.
Main Methods:
- Fabrication of a ZnP2/CuP2 composite catalyst.
- Characterization of catalyst structure and composition.
- Electrochemical testing for nitrate reduction to ammonia, including yield and Faraday efficiency measurements.
Main Results:
- The ZnP2/CuP2 composite catalyst exhibits abundant heterointerfaces.
- A tandem synergistic effect between ZnP2 and CuP2 sites was observed, driven by interfacial electronic interactions.
- Optimized catalyst achieved an NH3 yield of 46.3 mg h-1 mgcat-1 and a Faraday efficiency of 98.5%.
Conclusions:
- The constructed ZnP2/CuP2 composite catalyst effectively promotes nitrate to ammonia conversion.
- Synergistic effects and interfacial modulation are key to the catalyst's high performance.
- This work presents a promising strategy for efficient electrochemical ammonia synthesis from nitrate.
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