Dynamic evolution of Co species and morphological reconstruction on Co-N-C during the nitrate reduction reaction in neutral solution  

作　　者：Yuanlin Fu Xiaoting Yang Ya Yu Kang Zhou Xiaoyang Ye Aoxiang Zhang Xiaojiao Hou Bingbing Chen Fuqiang Fan Yuhang Li Yu Fu 

机构地区：[1]Department of Chemistry,College of Sciences,Northeastern University,Shenyang 110819,China [2]Department of Physical Education,Shen Yang Institute of Science and Technology,Shenyang 110167,China [3]Sungrow Power Supply Co.,Ltd.,Hefei 230088,China

出　　处：《Nano Research》2025年第1期164-172,共9页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.22175030);the Open Project of State Key Laboratory of Supramolecular Structure and Materials(No.sklssm 202406).

摘　　要：The electrochemical nitrate reduction reaction(eNO_(3)^(-)RR)is considered an effective approach for converting nitrate-containing wastewater to ammonia.The adsorption and activation of NO_(3)^(-)is the critical step for many materials and the high energy barrier inhibits the continuation of the reduction reaction.The Co nanoparticles encapsulated in the carbon layer we prepared spontaneously react with NO_(3)^(-)and the resulting Co^(2+)is then reduced by electroreduction to Co^(0),which circulates continuously.This resulted in overcoming the energy input required for NO_(3)^(-)adsorption and conversion,thereby increasing the catalytic activity.At the same time,the morphology of the catalyst reconstructed from a dodecahedron to an interwoven nanosheet structure and the increased surface area also gives it better properties.The obtained Co(OH)_(2)@Co-N-C has an excellent eNO_(3)^(-)RR of 2774.7μg·h^(-1)·cm^(-2)with a Faraday efficiency of 81.4%in neutral solution.At the same time,the material-modified electrode can run stably for more than 100 h.Our work provides a new idea for the design of Co-based catalysts for eNO_(3)^(-)RR.

关 键 词：electrochemical nitrate reduction reaction Co-based catalyst dynamic evolution of Co species morphological reconstruction 

分 类 号：O64[理学—物理化学]