Electrodeposition of dense spherical Ni3P on nickel foam cathode enhance nitrate electrochemical reduction via promoting nitrate adsorption

作者：Wenzhao Fu, Guangyuan Meng, Di Yin, Xinwan Zhang, Yaqi Shi, Zhengwu Yang, Dingming Chang, Peng Chen, Lehua Zhang · 发表于：Journal of environmental chemical engineering · 年份：2024 · DOI：10.1016/j.jece.2024.114815 · 被引用次数：10 · 研究领域：Ammonia Synthesis and Nitrogen Reduction、Caching and Content Delivery、Nanomaterials for catalytic reactions

Electrochemical nitrate reduction to nitrogen gas is considered as an alternative strategy to address water pollution problem, but the high cost and poor product selectivity of electrode limit its application. Here, Ni 3 P loaded nickel foam was fabricated via one-step eletrodeposition as cathode for electrochemical nitrate reduction. Due to the improvement of electron transfer rate and electrochemically active surface area , current efficiency and reaction rate constant enhanced 20.4-flod and 40-fold, respectively. Batch experiments revealed the remarkable nitrate reduction performance (∼97.53 %) after the optimization of potential, initial NO 3 - concentration and pH. Presence of chlorine induced electrochlorination will tune N 2 (selectivity up to ∼100 %) to become the dominant products. Mechanism study suggested that the atomic H*-mediated indirect reduction, meanwhile properties of Ni 3 P to strengthen NO 3 - adsorption and prevent desorption of NO and NO 2 are responsible for the enhancement of nitrate reduction. This work is meaningful for water environment protection and energy sustainable development.