镍/氧化镍复合材料用于尿素电催化氧化的研究  

Study on Electrocatalytic Oxidation of Urea by Nickel/Nickel Oxide Composites

作　　者：武娜[1,2] 王裕涵 乔弋辰 王嘉钰 洪明明 常文津 杨嘉乐 王炎[1] WU Na;WANG Yuhan;QIAO Yichen;WANG Jiayu;HONG Mingming;CHANG Wenjin;YANG Jiale;WANG Yan(Department of Chemical and Materials Engineering,Lyuliang University,Liliang 033001,China;Institute of New Carbon-based Materials and Zero-carbon and Negative-carbon Technology,Lyuliang University,Liliang 033001,China)

机构地区：[1]吕梁学院化工与材料工程系,山西吕梁033001 [2]吕梁学院碳基新材料及零碳负碳利用技术研究所,山西吕梁033001

出　　处：《山西大学学报（自然科学版）》2024年第4期842-853,共12页Journal of Shanxi University(Natural Science Edition)

基　　金：山西省自由探索类青年基金(202203021222317);吕梁市科技局高新领域项目(2023GXYF05);山西省大学生创新创业训练项目(S202310812006);吕梁学院教学改革创新项目(XJKCSZ202301)。

摘　　要：以蛋壳膜为碳载体,NiSO_(4)·6H_(2)O为镍源前驱体,尿素作为矿化剂,通过简单的一步水热法制备了一种尿素氧化反应(urea oxidation reaction,UOR)电催化剂。采用X射线衍射(X-ray diffraction,XRD)、扫描电镜(Scanning electron microscope,SEM)、透射电镜(Transmission electron microscope,TEM)和X射线光电子能谱(X-ray Photoelectron Spectroscopy,XPS)等手段对催化剂的组分与物相,微观形貌和化合价进行了测试表征,采用循环伏安法(Cyclic voltammetry,CV)、电化学阻抗谱(Electrochemical impedance spectroscopy,EIS)和计时电流法(i-time,i-t)等电化学方法对电催化剂的催化活性、稳定性等性能进行了测试评价。结果表明Ni/NiO-C@400对尿素氧化反应具有良好的电催化活性(电压0.60 V vs.饱和甘汞电极(Saturated calomel electrode,SCE),电流密度为182 mA·cm^(-2))和稳定性(12 h i-t测试后,电流密度保持率为95%),其原因可能是N和S原子的存在,Ni更容易形成尿素氧化的活性物种Ni^(3+),此外Ni和NiO的协同作用更有助于催化剂保持优良的催化活性和稳定性。Electrocatalyst for urea oxidation reaction(UOR) was prepared by a simple one-step hydrothermal method using eggshell membrane as carbon carrier,NiSO_(4)·6H_(2)O as nickel precursor and urea as mineralizer.The components,phases,micromorphology and valency of the catalysts were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS).The catalytic activity and stability of the electrocatalysts were evaluated by electrochemical methods such as Cyclic voltammetry(CV)、Electrochemical impedance spectroscopy(EIS) and i-time(i-t).The results show that Ni/NiO-C@400 has good electrocatalytic activity(voltage 0.60 V vs SCE,current density 182 mA·cm^(-2))and stability(current density retention 95% after 12 h i-t test) for urea oxidation reaction,which may be due to the presence of N and S atoms,Ni is more likely to form the active species Ni^(3+) for urea oxidation.In addition,the synergistic effect of Ni and NiO is more conducive to maintaining excellent catalytic activity and stability.

关 键 词：尿素氧化反应 蛋壳膜 协同效应 杂原子 

分 类 号：O436[机械工程—光学工程]