Effects of current density on preparation and performance of Al/conductive coating/α-PbO_2-Ce O_2-TiO_2/β-Pb O_2-MnO_2-WC-ZrO_2 composite electrode materials  

电流密度对Al/导电涂层/α-PbO_2-CeO_2-TiO_2/β-PbO_2-MnO_2-WC-ZrO_2复合电极材料制备和性能的影响(英文)

作　　者：杨海涛[1] 陈步明[1] 郭忠诚[1,2] 刘焕荣[3] 张永春[1] 黄惠[1,4] 徐瑞东[1,4] 付仁春[5] 

机构地区：[1]昆明理工大学 冶金与能源工程学院,昆明650093 [2]昆明理工恒达科技有限公司,昆明650022 [3]昆明理工大学 国土资源工程学院,昆明650093 [4]昆明理工大学 复杂有色金属资源清洁利用省部共建国家重点实验室培育基地,昆明650093 [5]昆明理工大学 理学院,昆明650093

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第10期3394-3404,共11页中国有色金属学报（英文版）

基　　金：Projects(51004056,51004057)supported by the National Natural Science Foundation of China;Project(KKZ6201152009)supported by the Opening Foundation of Key Laboratory of Inorganic Coating Materials,Chinese Academy of Sciences;Project(2010ZC052)supported by the Applied Basic Research Foundation of Yunnan Province,China;Project(20125314110011)supported by the Specialized Research Fund for the Doctoral Program of Higher Education,China;Project(2010247)supported by Analysis&Testing Foundation of Kunming University of Science and Technology,China

摘　　要：Al/conductive coating/α-Pb O2-Ce O2-Ti O2/β-PbO 2-MnO 2-WC-Zr O2 composite electrode material was prepared on Al/conductive coating/α-PbO 2-Ce O2-Ti O2 substrate by electrochemical oxidation co-deposition technique. The effects of current density on the chemical composition, electrocatalytic activity, and stability of the composite anode material were investigated by energy dispersive X-ray spectroscopy（EDXS）, anode polarization curves, quasi-stationary polarization（Tafel） curves, electrochemical impedance spectroscopy（EIS）, scanning electron microscopy（SEM）, and X-ray diffraction（XRD）. Results reveal that the composite electrode obtained at 1 A/dm2 possesses the lowest overpotential（0.610 V at 500 A/m2） for oxygen evolution, the best electrocatalytic activity, the longest service life（360 h at 40 °C in 150 g/L H2SO4 solution under 2 A/cm2）, and the lowest cell voltage（2.75 V at 500 A/m2）. Furthermore, with increasing current density, the coating exhibits grain growth and the decrease of content of Mn O2. Only a slight effect on crystalline structure is observed.通过电化学氧化共沉积技术在A1/导电涂层/α-Pb O2-Ce O2-Ti O2基体上,制备了A1/导电涂层/α-PbO 2-Ce O2-Ti O2/β-Pb O2-MnO 2-WC-Zr O2复合阳极材料。通过能量色散X射线光谱(EDXS)、阳极极化曲线、暂稳态极化曲线(Tafel)、交流阻抗谱(EIS)、扫描电子显微镜(SEM)以及X射线衍射(XRD)等方法研究电流密度对复合阳极材料的化学组分、电化学活性和稳定性的影响。研究结果表明:在电流密度为1 A/dm2条件下制备的A1/导电涂层/α-PbO 2-Ce O2-Ti O2/β-PbO 2-MnO 2-WC-Zr O2复合材料具有最低的析氧过电位(0.610 V,条件:500 A/m2),最好的电化学活性,最长的使用寿命(360 h,条件:150 g/L H2SO4,2 A/cm2,40°C)以及最低的槽电压(2.75 V,条件:500 A/m2)。而且,随着电流密度的增加,涂层晶粒逐渐增大,MnO 2含量也逐渐降低,晶体结构几乎没有变化。

关 键 词：composite electrode material A1 substrate β-PbO2-MnO2-WC-ZrO2 electrochemical co-deposition current density 

分 类 号：O646[理学—物理化学] TB333[理学—化学]