Facile fabrication of NiCo-hydroxysulfide nanosheets array for electrocatalytic urea oxidation  

作　　者：Jing ZOU Chang LIU Kun XIANG Qiong LI Shihao DAI Jizhou JIANG 

机构地区：[1]School of Chemistry and Environmental Engineering,School of Environmental Ecology and Biological Engineering,Key Laboratory of Green Chemical Engineering Process of Ministry of Education,Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education,Novel Catalytic Materials of Hubei Engineering Research Center,Wuhan Institute of Technology,Wuhan 430205,China

出　　处：《Science China(Technological Sciences)》2025年第1期218-228,共11页中国科学(技术科学英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant No.62004143);the Key R&D Program of Hubei Province(Grant No.2022BAA084);the Natural Science Foundation of Hubei Province(Grant No.2021CFB133);the National Key R&D Program of China(Grant No.2022YFC3902703);the Innovation Project of Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education(Grant Nos.LCX2021003,LCX202304);the Scientific Research Foundation of Wuhan Institute of Technology(Grant No.K202253);the Open Research Fund of Key Laboratory of Material Chemistry for Energy Conversion and Storage(HUST),Ministry of Education(Grant No.2021JYBKF05);the 14th Graduate Education Innovation Fund of Wuhan Institute of Technology(Grant Nos.CX2022462,CX2023141)。

摘　　要：Urea oxidation reaction(UOR)instead of anodic oxygen evolution reaction(OER)is considered an effective way to reduce energy consumption in electrocatalytic water splitting for hydrogen production.Nevertheless,the slow rate of reaction of UOR,which entails a procedure of transferring six electrons,has hindered its widespread use.Therefore,it is crucial to design highly effective electrocatalysts for the implementation of UOR.Herein,a novel NiCo-hydroxysulfide(NiCo-HOS)electrocatalyst has been reported for UOR,which is obtained by the exchange of sulfur ions in NiCo layered double hydroxide(NiCo-LDH)nanosheets at room temperature.Benefitting from the sulfurization process,the composition,electronic structure,and surface properties of electrocatalysts have undergone significant changes and optimizations.Following sulfurization treatment,the resulting NiCo-HOS showed enhanced chemical resistance to alkaline electrolytes and improved electrical conductivity.In a 40 h operation test,it maintained high stability and provided a stable current density of 100 mA cm^(-2)at a relatively low potential of 1.33 V(vs.RHE)in a solution of 1 mol L^(-1)KOH+0.5 mol L^(-1)urea.Subsequently,the anode electrolytic product is analyzed through gas chromatography(GC),and N_2 is detected as the product without the presence of CO,indicating that the urea has undergone complete oxidation.

关 键 词：urea oxidation reaction NiCo-hydroxysulfide electrocatalyst hydrogen 

分 类 号：TQ116.2[化学工程—无机化工] O643.36[理学—物理化学] TB383.1[理学—化学]