采用电沉积法制备不同浓度聚乙烯吡咯烷酮(PVP)改性PbO2电极,通过SEM.XRD、电化学阻抗谱(EIS)和线性极化(VA)等方法表征其微结构和电化学性能,研究了PVP对电极电化学性能的影响.结果表明,PVP的包覆和空间位阻作用可抑制晶粒生长速度和团聚作用,使电极表面晶粒细化均匀,微结构得以改善;改性PbO2电极具有更低的电化学反应电阻和更高的析氧电位;适量的PVP掺杂可有效提高电极的电催化性能,其中0.4 g·L-1PVP改性电极的电催化活性最佳.最佳改性PbO2电极显示了良好的耐腐蚀性和电催化稳定性,使用90 h后其降解率仍能达到81.5%.
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