引入电弧喷涂氮化锆中间层的钛基PbO2的电催化阳极性能

2021-04-26 16:03:24 作者：唐长斌来源：材料研究学报分享至：

摘要

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。

关键词：材料表面与界面 ; 钛基二氧化铅阳极 ; 中间层 ; 氮化锆电弧喷涂层 ; 电化学氧化 ; 延寿

Abstract

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.

Keywords： surface and interface in the materials ; titanium-based lead dioxide anode ; interlayer ; zirconium nitride arc spray coating ; electro-oxidation ; life extension