Efficient Electroreduction of Nitrate into Ammonia at Ultralow Concentrations Via an Enrichment Effect

• DOI: 10.1002/adma.202204306
• Publication Date: 2022-07-15T18:38:34Z
• Authors: Zhimin Song; Yan Liu; Yongzhi Zhong; Qing Guo; Jie Zeng; Zhigang Geng
• Keywords: Reversible hydrogen electrode; Carbon fibers

The electroreduction of nitrate (NO3- ) pollutants to ammonia (NH3 offers an alternative approach for both wastewater treatment and NH3 synthesis. Numerous electrocatalysts have been reported the NO3- , but most them demonstrate poor performance at ultralow concentrations. In this study, a Cu-based catalyst concentrations is developed by encapsulating Cu nanoparticles in porous carbon framework (Cu@C). At -0.3 V vs reversible hydrogen electrode (RHE), Cu@C achieves Faradaic efficiency 72.0% with 1 × 10-3 m which 3.6 times higher than that nanoparticles. Notably, -0.9 RHE, yield rate 469.5 µg h-1 cm-2 highest value . An investigation mechanism reveals can be concentrated owing enrichment effect Cu@C, thereby facilitating mass transfer efficient into