Amorphous nickel phosphide as a noble metal-free cathode for electrochemical dechlorination.

Author(s) Yao, Q.; Zhou, X.; Xiao, S.; Chen, J.; Abdelhafeez, I.A.; Yu, Z.; Chu, H.; Zhang, Y.
Journal Water Res
Date Published 2019 Nov 15
Abstract

Nickel phosphide (NiP) is an emerging efficient catalyst for the hydrogen evolution and water splitting. Herein, we report that NiP is also a promising catalyst for enhancing electrochemical dechlorination of chlorinated disinfection byproducts (DBPs). Amorphous NiP (ANP) mini-nanorod arrays were in-situ fabricated on nickel foam (NF) via a facile phosphidation process, and then used as a binder-free cathode for electrochemical dechlorination of trichloroacetic acid (TCAA). Results showed that ANP exhibited superior performance on electrochemical dechlorination of TCAA than other metal cathodes (e.g., NF and Pd/C). Scavenging experiments and electron spin resonance (ESR) technique indicated that atomic H* was generated from water reduction through ANP catalysis, and primarily contributed to TCAA dechlorination. Indeed, the superhydrophilic surface of ANP favored electrocatalyst/electrolyte contact, and its low impedance further afforded rapid electron transport from the electrode to water or protons for atomic H* generation. The kinetic modelling and mass balance evaluation revealed the transformation mechanism of TCAA dechlorination. This study is among the first to develop ANP as a binder-free cathode for electrochemical dechlorination, and have important implications for eliminating chlorinated DBPs in water.

DOI 10.1016/j.watres.2019.114930
ISSN 1879-2448
Citation Yao Q, Zhou X, Xiao S, Chen J, Abdelhafeez IA, Yu Z, et al. Amorphous nickel phosphide as a noble metal-free cathode for electrochemical dechlorination. Water Res. 2019;165:114930.

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