Ti/SnO_2 +Sb_2O_x/PbO_2耐酸阳极的寿命及电催化性能

Study on Stability and Electricity Catalytic Properties of Ti/SnO_2 +Sb_2O_x/PbO_2 Acid-proof Anode

用电沉积法制备了Ti/SnO2 +Sb2Ox/PbO2耐酸阳极,采用交流阻抗法测定了电极的导电性,利用加速寿命实验测定了电极的加速使用寿命,同时引入循环伏安新方法定量考察不同Sb掺杂物质的量分数对电极表面分形维数的影响,并且讨论了电极在酸性溶液中的析氧电催化性能。结果表明,Sb掺杂物质的量分数在0.02和0.10时Ti/SnO2 +Sb2Ox/PbO2电极的分形维数较高,表明电极表面粗糙程度较大,析氧电催化性能较好,是优良的高析氧电位下的阳极材料,适用于阳极氧化获得产品的电极过程。Sb掺杂物质的量分数为0.06时Ti/SnO2 +Sb2Ox/PbO2电极的导电性最好,加速使用寿命达到89 h。因此,Ti/SnO2 +Sb2Ox/PbO2电极是酸性溶液中较好的阳极材料。

Acid-proof Ti/SnO2＋Sb2Ox/PbO2 anode with SnO2 ＋Sb2Ox interlayers were prepared by electrodepositing method.Conductivity and accelerated service life of the electrode were determined by AC impedance experiment and at 4 A/cm2 respectively.The cyclic voltammetry curve of Ti/SnO2 ＋Sb2Ox/PbO2 electrodes was examined in 0.5 mol/L H2SO4 solution in three electrodes system with scanning speed changes,and the fractal dimensions of the electrode surface were quantitatively calculated under the different Sb doping ratios simultaneously,the relation between fractal dimension and electrocatalysis performance of evolution oxygen in acid solution was discussed emphatically.The results indicated that the conductivity of the anode reached a maximum and the accelerated service life of it is up to 89 h when the doping ratio is 0.06.The Ti/SnO2 ＋Sb2Ox/PbO2 electrode is an ideal anode materials in acidic solution,when Sb doping ratios were 0.02 and 0.10 the fractal dimension of Ti/SnO2 ＋Sb2Ox/PbO2 electrode were higher,and electrocatalytic activity were also higher than other conditions.