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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
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)
作者简介
王雅琼，女，1961年生，博士生，南京理工大学化工学院，江苏南京210094，电话：0514-7975225，E-mail：yqwang@mail．yzu．edu．cn
