Ti/IrO_2+MnO_2+CeO_2阳极负载量对析氧电催化性能的影响
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摘要
采用溶胶凝胶法制得了Ti/IrO_2+MnO_2+CeO_2氧化物阳极,研究了涂层负载量对Ti/IrO_2+MnO_2+CeO_2阳极电催化性能和加速寿命的影响。析氧极化曲线、循环伏安曲线、交流阻抗图谱及加速寿命实验测试结果表明,涂层负载量对阳极性能有很大的影响,随着负载量的增加,阳极的活性表面积增多,伏安电荷量Q*和双电层电容Qdl迅速增加,当负载量大于7.5g/m2后,增速明显放缓;同时阳极的加速寿命值也呈现出相同的趋势,在负载量为12.5g/m2时,阳极的加速寿命值达到最大。
The oxide anodes of Ti/IrO_2+MnO_2+CeO_2 were prepared by sol-gel method.The effect of coating loading on the electrocatalytic activity and accelerated life of Ti/IrO2+MnO2+CeO2 anode were investigated.The oxygen evolution polarization curve,cyclic voltammetry curve,electrochemical impedance spectrum and accelerated life test results indicate that the coating loading has a great influence on the anode performance.With the increase of the loading,the active surface area of the anode increases,the voltammetric charge Q*and the electric double layer capacitance Qdlincrease rapidly.When the loading is more than 7.5 g/m~2,the growth rate obviously slows down;at the same time,the accelerated life value of the anode also increases rapidly.When the loading is 12.5 g/m~2,the accelerated life of the anode reaches the maximum.
The oxide anodes of Ti/IrO_2+MnO_2+CeO_2 were prepared by sol-gel method.The effect of coating loading on the electrocatalytic activity and accelerated life of Ti/IrO2+MnO2+CeO2 anode were investigated.The oxygen evolution polarization curve,cyclic voltammetry curve,electrochemical impedance spectrum and accelerated life test results indicate that the coating loading has a great influence on the anode performance.With the increase of the loading,the active surface area of the anode increases,the voltammetric charge Q*and the electric double layer capacitance Qdlincrease rapidly.When the loading is more than 7.5 g/m~2,the growth rate obviously slows down;at the same time,the accelerated life value of the anode also increases rapidly.When the loading is 12.5 g/m~2,the accelerated life of the anode reaches the maximum.
引文
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[4]范农杰,竺培显,韩朝辉,等.稀土La对RuO2-TiO2涂层钛阳极表面结构和性能的影响[J].材料热处理学报,2015,36(7):217-221.FAN Nongjie,ZHU Peixian,HAN Zhaohui,et al.Effect of rare earth La on surface structure and properties of RuO2-TiO2 coated titanium anode[J].Journal of Material Heat Treatment,2015,36(7):217-221.
[5]BATTISTI A D,BRINA R,GAVELLI G,et al.Influence of the valve metal oxide on the properties of ruthenium based mixed oxide electrodes:Part I.Titanium supported RuO2/Ta2O5layers[J].Journal of Electroanalytical Chemistry&Interfacial Electrochemistry,1986,200(1):93-104.
[6]唐电,颜琦,崔雄.关于钛阳极涂层的显微组织[J].氯碱工业,1994(8):28-31.TANG Dian,YAN Qi,CUI Xiong.Microstructure of titanium anode coating[J].Chlor-alkali industry,1994(8):28-31.
[7]TEREZO A J,PEREIRA E C.Preparation and characterisation of Ti/RuO2anodes obtained by sol-gel and conventional routes[J].Materials Letters,2002,53(4):339-345.
[8]YANG L,Li Z,Li J.IrO/SnO electrodes:prepared by sol-gelprocess and their electrocatalytic for pyrocatechol[J].Acta Materialia,2004,52(3):721-727.
[9]SAVINELL R F.Electrochemically Active Surface Area[J].Journal of the Electrochemical Society,1990,137(2):60-67.
[10]HU J M,MENG H M,ZHANG J Q,et al.Degradation mechanism of long service life Ti/IrO-TaO oxide anodes in sulphuric acid[J].Corrosion Science,2002,44(8):1655-1668.
[11]XU L K,SCANTLEBURY J D.A study on the deactivation of an IrO-TaO coated titanium anode[J].Corrosion Science,2003,45(12):2729-2740.
[12]CHU L,XU L,WU L,et al.Effect of oxalic acid etching on morphology and electrocatalytic activity of oxide anodes[J].Acta Metallrugica Sinica,2005,41(7):763-768.