采用Pechini法制得Ti/IrO2-Ta2O5氧化物阳极,研究了涂层载量对Ti/IrO2-Ta2O5阳极微观结构和析氧电催化性能的影响.SEM、EDX、极化曲线、循环伏安及强化电解试验等测试结果表明:涂层载量增加,涂层裂缝变窄变浅,且IrO2晶粒偏析趋于增强;同时也提高了阳极析氧电催化活性,增大阳极活性表面积及延长阳极使用寿命;强化电解寿命与Ir涂覆量(1.98～9.08g/m2)基本呈线性递增关系.
The anodes of Ti/IrO2-Ta2O5 were prepared by Pechini method. The effects of coating loading on the surface morphology and electrochemical properties of the anodes were characterized by scanning electron microscope ( SEM) ,energy dispersive X-ray detector ( EDX) ,potentiodynamic polarization,cyclic voltammetry and accelerated life test. The results indicate that with the increase of the coating loading,the oxide anode presents evident IrO2 crystallite segregation,and cracks become narrow and shallow. Moreover,it has larger electrochemically active surface area,better electrocatalytic activity for oxygen evolution and higher stability. It was observed that for an iridium content of 1. 98 ～ 9. 08 g/m2 the service life is almost proportional to the iridium content in the coating.
[1]Hu Shixin(胡士信).Handbook of cathodic protection engineering[M].Beijing:Chemical Industry Press,1999.
[2]Wang Juntao(王均涛),Han Yan(韩严),Xu Likun(许立坤),et al.The deactivation mechanism of metal oxide anodes under alternative current electrolysis condition[J].Electrochemistry(电化学),2005,11(4):407-411.
[3]Ji Lei(嵇雷),Wang Juntao(王均涛),Liu Wenbin(刘文彬),et al.The effect of Ru∶Sn on properties of Ru-Ir-Sn oxide anode coatings[J].Electrochemistry(电化学),2008,14(3):263-268.
[4]Terezo A J,Pereira E C.Preparation and characterisation of Ti/RuO2anodes obtained by sol-gel and conventional routes[J].Mater Lett,2002,53:339-345.
[5]Xu L K(许立坤),Xin Y L(辛永磊),Wang J T(王均涛).A comparative study on IrO2-Ta2O5coated titani-um electrodes prepared with different methods[J].Elec-trochimica Acta,2009,54(6):1820-1825.
[6]Krysa J,Maixner J,Mraz R,et al.Effect of coating thick-ness on the properties of IrO2-Ta2O5anodes[J].J Appl Electrochem,1998,28:369-372.
[7]Zhang Z X(张招贤).Titanium electrode engineering[M].Beijing:Metallurgy Industry Press,2003.
[8]Krysa J,kule L,Mraz R,et al.Effect of coating thickness and surface treatment of titanium on the properties of IrO2-Ta2O5anodes[J].J Appl Electrochem,1996,26:999-1005.
[9]Terezo A J,Pereira E C.Fractional factorial design ap-plied to investigate properties of Ti/IrO2-Nb2O5elec-trodes[J].Electrochimica Acta,2000;45:4351-4358.
[10]Liu Y,Li Z Y,Li J H.IrO2/SnO2electrodes:prepared by sol-gel process and their electrocatalytic for pyrocat-echol[J].Acta Materialia,2004,52:721-727.
[11]Savinell R F,ZellerⅢR L,Adams J A,et al.Electro-chemically active surface area[J].J Electrochem Soc,1990,137:489.
[12]Xu L K,Scantlebury J D.A study on the deactivation of an IrO2-Ta2O5coated titanium anode[J].Corro Sci,2003,45:2729-2740.
[13]Chu Liying(初立英),Xu Likun(许立坤),Wu lianbo(吴连波),et al.Effect of oxalic acid etching on mor-phology and electrocatalytic activity of oxide anodes[J].Acta Metall Sin(金属学报),2005,41(7):763-768.
