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

Wenzhao Fu, Guangyuan Meng, Di Yin, Xinwan Zhang, Yaqi Shi, Zhengwu Yang, Dingming Chang, Peng Chen, Lehua Zhang*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

2 Citations (Scopus)

Abstract

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, Ni3P 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 NO3- concentration and pH. Presence of chlorine induced electrochlorination will tune N2 (selectivity up to ∼100 %) to become the dominant products. Mechanism study suggested that the atomic H*-mediated indirect reduction, meanwhile properties of Ni3P to strengthen NO3- adsorption and prevent desorption of NO and NO2 are responsible for the enhancement of nitrate reduction. This work is meaningful for water environment protection and energy sustainable development. © 2024
Original languageEnglish
Article number114815
JournalJournal of Environmental Chemical Engineering
Volume12
Issue number6
Online published13 Nov 2024
DOIs
Publication statusPublished - Dec 2024

Research Keywords

  • Electrocatalysis
  • Nickel foam
  • Nickel phosphide
  • Nitrate electroreduction
  • Transition metal phosphide

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