Efficient electrocatalytic reduction of nitrate to ammonia at low concentration by copper-cobalt oxide nanowires with shell-core structure  

作　　者：Chenhao Xiao Yaxiao Guo Jiayuan Sun Tao Guo Xinyuan Jia Shinuo Guo Guancheng Wu Yue Sun Zhaoyang Yao Yi Liu 

机构地区：[1]State Key Laboratory of Separation Membranes and Membrane Processes,School of Chemistry,Tiangong University,Tianjin 300387,China [2]Key Laboratory of Functional Polymer Materials,College of Chemistry,Nankai University,Tianjin 300071,China [3]School of Chemical and Environmental Engineering,Wuhan Polytechnic University,Wuhan 430023,China

出　　处：《Nano Research》2024年第6期5087-5094,共8页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(No.22204119);Science and Technology Plans of Tianjin(No.22ZYJDSS00070).

摘　　要：Electrocatalytic nitrate reduction to ammonia(NO3−RR)for removing nitrate from wastewater is a promising but challengeable technology that is increasingly studied.Herein,we developed an efficient CuO_(x)and CoCuO_(x)composed hybrid catalyst(CoCuO_(x)@CuO_(x)/copper foam(CF)),characteristic of distinctive shell-core nanowires grown on CF substrate with CuO_(x)core and CoCuO_(x)shell.The built-in electric field formed at the interface of the CoO/Cu_(2)O heterostructure promotes NO3−adsorption by modulating the charge distribution at the interface,which greatly improves the ammonia yield rate and Faradaic efficiency.At−0.2 V vs.reversible hydrogen electrode(RHE),CoCuO_(x)@CuO_(x)/CF achieves not only an excellent ammonia yield rate of up to 519.1μg·h^(−1)·cm^(−2)and Faradaic efficiency of 99.83%at 1 mM NO3−concentration,but also excellent mechanical stabilities.This study provides a novel pathway to design electrocatalyst for the removal of nitrate from dilute nitric acid solutions(≤2 mM).

关 键 词：CoCuO_(x)@CuO_(x)/copper foam(CF) shell-core nanowires heterostructure low concentration nitrate electroreduction to ammonia 

分 类 号：O64[理学—物理化学]