Huaqiang Li, Haifeng Fu, Baoling Zhang, Chao Sun, Shu-Min Yin
characterization and theoretical computations, and key performance-governing factors such as electrolyte composition, pH, and applied potential. Furthermore, this article highlights the application potential of this technology in wastewater treatment, distributed ammonia synthesis, and metal-nitrate batteries. Finally, we outline current challenges related to catalyst stability in complex media, reactor engineering, and system integration, and offer perspectives on future research directions, aiming to promote the practical implementation of nitrate reduction technology, thereby contributing to closing the nitrogen cycle and establishing a sustainable ammonia economy.