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引入電弧噴涂氮化鋯中間層的鈦基PbO2的電催化陽極性能

2021-04-26 16:03:24 作者：唐長斌來源：材料研究學報分享至：

摘要

在鈦基體電弧噴涂氮化鋯中間層，然后在其上陽極電沉積涂覆β-PbO2催化表層，制備出Ti/ZrN/PbO2陽極。對其進行微觀結構分析和表面粗糙度測試、中間層附著力評價、電極加速壽命和電化學性能測試以及電氧化苯酚模擬廢水實驗，并與無中間層的Ti/PbO2電極對比，研究了有中間層的鈦基PbO2涂層的陽極性能。結果表明，氮化鋯中間層使陽極材料的導電性提高，中間層的粗糙表面使PbO2電沉積層明顯細化，表面整平性凸顯，涂層與基體結合牢固，PbO2沉積厚度增加，活性位點的數量增多。有氮化鋯中間層的陽極加速壽命顯著延長，比Ti/PbO2電極延長了7倍，對有機污染物的電催化降解活性也有提高。

關鍵詞：材料表面與界面 ; 鈦基二氧化鉛陽極 ; 中間層 ; 氮化鋯電弧噴涂層 ; 電化學氧化 ; 延壽

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