RuO_2含量对Ti/SnO_2+Sb_2O_3/RuO_2+PbO_2阳极性能的影响  

Effects of RuO_2 Contents on Characteristics of Ti/SnO_2+Sb_2O_3/RuO_2+PbO_2 Electrodes

作　　者：王雅琼[1] 王鹏[2] 沙红霞[2] 许文林[2] 陆路德[1] 

机构地区：[1]南京理工大学化工学院,江苏南京210094 [2]扬州大学化学化工学院,江苏扬州225002

出　　处：《稀有金属材料与工程》2007年第3期424-427,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(20176047;20476087);江苏省高校自然科学研究计划项目(03KJB530164)

摘　　要：采用热分解法制备了以钛为基体、SnO2+Sb2O3为中间层、RuO2+PbO2为活性层的Ti/SnO2+Sb2O3/RuO2+PbO2电极。应用极化曲线法和循环伏安法测定不同RuO2含量下电极在25℃,0.5mol/LH2SO4溶液中的电催化活性。实验结果表明,随着RuO2含量的增加,相同电极电位下的电流密度增大;相同的扫描速率下,RuO2含量增加,电极的伏安电荷值增加,即电极的电催化活性随着RuO2含量的增加而增加。在1.0mol/LH2SO4溶液中,60℃、电流密度为2.0A/cm2条件下,电极寿命快速检测结果表明,Ti/SnO2+Sb2O3/RuO2+PbO2电极的寿命随RuO2含量的增加而下降;但与不加有SnO2+Sb2O3中间层的Ti/RuO2+PbO2电极相比,电极寿命则显著增加。RuO2的含量还对电极的表面形貌有明显的影响。The RuOz＋PbO2 coatings deposited on a Ti/SnO2＋Sb2O3 have been prepared by the thermal decomposition of RuCl3＋Pb（NO3）2. The surface morphology and microstructure of the coating were investigated by scanning electron microscopy. The electrocatalytic activity of the anodes was assessed by polarization curves and voltammetric charge at 25 ℃ and 1.0 mol/L in aqueous H2SO4. The results show that the current density on the Ti/SnO2＋Sb2O3/RuO2＋PbO2 electrodes increases at a constant electrode potential and the voltammetric charge also increases at a constant scanning rate with increasing the content of RuO2, it means that the electrocatalytic activity of the electrodes rises when RuO2 content increases. Accelerated life tests were performed at 60℃ and 1.0 mol/L in aqueous H2SO4 with an anodic current of 2.0 A/cm^2. The experimental results show that the accelerated lifetime decreases with increasing RuO2 content, but comparing with the electrodes without an intermediate layer, the accelerated lifetime of Ti/SnO2＋Sb2O3/RuO2＋PbO2 electrodes is prolonged obviously. The SEM analysis reveals that surfaces of the electrodes take on a variety of morphology with variation of the content of RuO2, which probably affect the electrocatalytic activity and the lifetime of the anodes.

关 键 词：二氧化钌 二氧化铅 电催化活性 寿命 

分 类 号：O646.5[理学—物理化学] O050.4[理学—化学]