Electrochemical nitrate reduction to ammonia using copper-based electrocatalysts
Rong Zhang,
Shaoce Zhang,
Huilin Cui,
Ying Guo,
Nan Li,
Chunyi Zhi
Affiliations
Rong Zhang
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, 999077, Hong Kong, China
Shaoce Zhang
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, 999077, Hong Kong, China
Huilin Cui
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, 999077, Hong Kong, China
Ying Guo
College of Materials Science and Engineering, Shenzhen University, Shenzhen, Guangdong, China
Nan Li
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, 999077, Hong Kong, China; Corresponding author.
Chunyi Zhi
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, 999077, Hong Kong, China; Centre for Functional Photonics, City University of Hong Kong, 83 Tat Chee Avenue, 999077, Hong Kong, China; Corresponding author at: Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, 999077, Hong Kong, China.
Ammonia (NH3) is an ideal green fuel with high energy density and plays an indispensable role in fertilizer production. Electrochemical reduction of nitrate (NO3–), a toxic pollutant in groundwater, has shown promising as a viable approach to converting waste into valuable NH3 under ambient conditions, offering an alternative to the energy-intensive Haber-Bosch process. Due to their high efficiency, copper (Cu)-based materials have shown great potential as electrocatalysts for the NO3– reduction reaction (NO3–RR) to NH3. In this review, we provide a comprehensive summary of the fundamental principles underlying nitrate reduction over Cu-based electrocatalysts and discuss various strategies to enhance the performance of NO3– reduction, including facets, morphologies, size, surface functionalization, compositional engineering, and defect engineering. We also delve into the relationship between the electrocatalytic performance and structure characteristics of electrocatalysts and thoroughly examine the reaction mechanism involved in NO3–RR. Furthermore, we highlight the existing challenges and prospective paths forward in this area of study. This review offers valuable insights and guidance for the strategic design and optimization of Cu-based electrocatalysts for NO3–RR applications.
