Unlocking the coupling potential of built-in electric field and pulsed electroreduction for efficient nitrate to ammonia at low concentrations

文献类型： 外文期刊

第一作者： Wang, He

作者： Wang, He;Chen, Kaiyi;Wei, Jiamin;Chen, Jun;Yang, Tinghai;Wang, He;Yan, Qun;Liu, Qiang;Yan, Qun

作者机构：

关键词： eNO3RA; Built-in electric field; Pulsed electroreduction; Low nitrate concentration; Sustainable nitrogen recycling

期刊名称：APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY （ 影响因子：21.1； 五年影响因子：20.2 ）

ISSN： 0926-3373

年卷期： 2025 年 374 卷

页码：

收录情况： SCI

摘要： Electrochemical nitrate reduction to ammonia (eNO3RA) provides a sustainable pathway for ammonia synthesis under ambient conditions while addressing nitrogen pollution and facilitating distributed production. However, enhancing eNO3RA performance in low-concentration nitrate systems remains challenging, given that such systems better represent real wastewater matrices, including groundwater and surface water. Here, a biocharbased catalyst, Co2Fe1/C, was developed with Co3O4 and Fe3O4 nanoparticles forming a built-in electric field to enhance nitrate adsorption. Furthermore, pulsed electroreduction method facilitated nitrate mass transport, resulting a 93.4% NH3-N selectivity in a neutral, low-concentration nitrate electrolyte. The efficacy of the pulsed mode in eNO3RA performance was also confirmed in experiments using actual groundwater and surface water samples. Reaction pathways were probed using in situ characterizations and density functional theory (DFT) calculations. A preliminary techno-economic analysis highlighted the viability of eNO3RA with Co2Fe1/C, and practical applicability was demonstrated by powering a timer with a Zn-NO3 battery. This work underscores the potential of coupling electric field engineering with pulsed mode operation to enhance ammonia synthesis in low-concentration nitrate systems while advancing sustainable nitrogen utilization.

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