“Research Progress in Electrocatalytic Reduction of Nitric Acid to Ammonia by Nonmetallic Element Doped Catalysts”, Int. J. Curr. Eng. Technol., vol. 15, no. 1, pp. 01–17, Feb. 2025, Accessed: Mar. 12, 2026. [Online]. Available: https://ijcet.evegenis.org/index.php/ijcet/article/view/1621