引入电弧喷涂氮化锆中间层的钛基PbO2的电催化阳极性能

在钛基体电弧喷涂氮化锆中间层，然后在其上阳极电沉积涂覆β-PbO₂催化表层，制备出Ti/ZrN/PbO₂阳极。对其进行微观结构分析和表面粗糙度测试、中间层附着力评价、电极加速寿命和电化学性能测试以及电氧化苯酚模拟废水实验，并与无中间层的Ti/PbO₂电极对比，研究了有中间层的钛基PbO₂涂层的阳极性能。结果表明，氮化锆中间层使阳极材料的导电性提高，中间层的粗糙表面使PbO₂电沉积层明显细化，表面整平性凸显，涂层与基体结合牢固，PbO₂沉积厚度增加，活性位点的数量增多。有氮化锆中间层的阳极加速寿命显著延长，比Ti/PbO₂电极延长了7倍，对有机污染物的电催化降解活性也有提高。

Properties of Ti-based PbO2 Electrocatalytic Anodes with an Arc Sprayed ZrN-interlayer

The Ti/ZrN/PbO₂ electrodes were prepared via an arc spraying ZrN-interlayer on the Ti-substrate and then followed by anodic electrodeposition of β-PbO₂ surface coating. By taking the plain Ti/PbO₂ electrode as comparison, the prepared electrodes were characterized in terms of microstructure, surface roughness, coating adhesion, accelerated life assessment, electrochemical performance and electro-oxidation of phenol. The results show that the accelerated life-time for Ti/ZrN/PbO₂ anodes was obviously prolonged to 8 times of that for the plain Ti/PbO₂ electrode. Meanwhile, the electrocatalytic degradation activity of this anode for the organic pollutants was enhanced. This is directly related to the improvement of the conductivity of the electrode brought by the arc sprayed ZrN interlayer and which then enables the layer of electrodeposited PbO₂ to be significantly refined and thicker with much flat surface and better adhesive to the substrate, as well as more active sites caused by the rough surface characteristics of this arc spraying intermediate layer.