TY  - JOUR
AU  - Xiao, Chenhao
AU  - Guo, Yaxiao
AU  - Sun, Jiayuan
AU  - Guo, Tao
AU  - Jia, Xinyuan
AU  - Guo, Shinuo
AU  - Wu, Guancheng
AU  - Sun, Yue
AU  - Yao, Zhaoyang
AU  - Liu, Yi
PY  - 2024
TI  - Efficient electrocatalytic reduction of nitrate to ammonia at low concentration by copper-cobalt oxide nanowires with shell–core structure
JO  - Nano Research
SN  - 1998-0124
SP  - 5087
EP  - 5094
VL  - 17
IS  - 6
AB  - 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 CuOx and CoCuOx composed hybrid catalyst (CoCuOx@CuOx/copper foam (CF)), characteristic of distinctive shell–core nanowires grown on CF substrate with CuOx core and CoCuOx shell. The built-in electric field formed at the interface of the CoO/Cu2O 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), CoCuOx@CuOx/CF achieves not only an excellent ammonia yield rate of up to 519.1 μg·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).
UR  - https://doi.org/10.1007/s12274-024-6530-8
DO  - 10.1007/s12274-024-6530-8