基于石墨毡生长的镍钴基化合物电极的双功能电催化性能  

Bifunctional Electrocatalytic Properties of Nickel-Cobalt-Based Compound Electrodes Grown on Graphite Felt

作　　者：庞宁 邢晓梅 童新[1] 熊大元[1,2] 徐少辉[1] 王连卫[1] Pang Ning;Xing Xiaomei;Tong Xin;Xiong Dayuan;Xu Shaohui;Wang Lianwei(Key Laboratory of Polarized Materials and Devices of Ministry of Education,East China Normal University,Shanghai 200241,China;Shanghai Key Laboratory of Multidimensional Information Processing,East China Normal University,Shanghai 200241,China)

机构地区：[1]华东师范大学极化材料与器件教育部重点实验室,上海200241 [2]华东师范大学上海市多维度信息处理重点实验室,上海200241

出　　处：《微纳电子技术》2022年第2期125-132,共8页Micronanoelectronic Technology

基　　金：国家自然科学基金资助项目(61774060);上海市科学技术委员会资助项目(14DZ2260800)。

摘　　要：以先水热后硫化的方法制备出基于石墨毡基底的镍钴基化合物(NiCo_(2)O_(4)/GF和NiCo_(2)S_(4)/GF)电极,探究不同水热温度对电极的催化特性的影响。通过扫描电子显微镜(SEM)、能量色散X射线光谱仪(EDS)、X射线衍射仪(XRD)和X射线光电子能谱仪(XPS)对样品表面形貌、结构、晶向及元素分布进行分析。通过循环伏安(CV)曲线、线性扫描伏安(LSV)曲线、Tafel曲线和电化学阻抗谱(EIS)研究其双功能催化特性。研究发现,水热温度130℃下,NiCo_(2)O_(4)/GF电极在析氢反应(HER)中表现优异,在10 mA·cm^(-2)的电流密度下具有52.2 mV的低过电位和87.6 mV·dec^(-1)的Tafel斜率;另外,水热温度140℃下,NiCo_(2)S_(4)/GF电极在析氧反应(OER)中也展示出卓越的性能,在10 mA·cm^(-2)的电流密度下具有215 mV的较低过电位和85.2 mV·dec^(-1)的Tafel斜率。同时两种电极的稳定性都表现极佳,在5000次的CV循环中总的电荷转移电阻基本不变。结果表明,镍钴基化合物表现出更好的双功能电催化特性。The nickel-cobalt-based compound electrodes(NiCo_(2)O_(4)/GF and NiCo_(2)S_(4)/GF)based on graphite felt were prepared by the method of first hydrothermal and then vulcanized to explore the influence of different hydrothermal temperatures on the catalytic properties of the electrodes.The scanning electron microscope(SEM),energy dispersive X-ray spectrometer(EDS),X-ray diffractometer(XRD)and X-ray photoelectron spectrometer(XPS)were performed to analyze the sample surface morphology,structure,crystal orientation and element distribution.The cyclic voltammogram(CV)curve,linear sweep voltammetry(LSV)curve,Tafel curve and electrochemical impedance spectroscopy(EIS)were used to study their bifunctional catalytic properties.It is found that the NiCo_(2)O_(4)/GF electrode at a hydrothermal temperature of 130℃performs well in the hydrogen evolution reaction(HER),with a low overpotential of 52.2 mV and a Tafel slope of 87.6 mV·dec^(-1)at a current density of 10 mA·cm^(-2).In addition,the NiCo_(2)S_(4)/GF electrode at a hydrothermal temperature of 140℃also shows excellent performance in the oxygen evolution reaction(OER),with a low overpotential of 215 mV and a Tafel slope of 85.2 mV·dec^(-1)at a current density of 10 mA·cm^(-2).At the same time,the stability of the two electrodes is excellent,and total charge-transfer resistance is basically unchanged during 5000 CV cycles.The results show that nickel-cobalt-based compounds provide a new idea to better display bifunctional electrocatalytic properties.

关 键 词：镍钴基化合物 石墨毡(GF) 析氢反应(HER)/析氧反应(OER) 纳米结构 双功能电催化性能 

分 类 号：TB381[一般工业技术—材料科学与工程] TB383