Study on Electrocatalytic Oxidation of Urea by Nickel/Nickel Oxide Composites
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以蛋壳膜为碳载体,NiSO4·6H2O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 Photo-electron 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Ni3+,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,NiSO4·6H2O 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 elec-tron 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 Ni3+for urea oxidation.In addition,the synergistic effect of Ni and NiO is more conducive to maintaining excellent catalytic activity and stability.
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