多元异质结CdS/PbS/TiO2的制备及其对304不锈钢光生阴极保护性能研究

采用阳极氧化法制备TiO₂纳米管，通过超声辅助连续离子沉淀法对TiO₂纳米管进行CdS/PbS共复合修饰改性。应用X射线衍射 (XRD)、扫描电镜 (SEM) 及其配套的能谱分析 (EDS) 对CdS/PbS/TiO₂的晶型特征、表面形貌及元素分布进行表征；利用电化学分析方法研究了复合次序对CdS/PbS/TiO₂的光电性能影响，考察了CdS/PbS/TiO₂复合材料对304不锈钢的阴极保护性能。结果表明:成功制备了晶型特征和表面形貌良好的CdS/PbS/TiO₂多元异质结；先复合9次PbS、再复合15次CdS的TiO₂纳米管具有更加优良的光电性能；光照下CdS/PbS/TiO₂复合材料对304不锈钢光生阴极保护性能显著优于单一PbS复合的TiO₂和纯TiO₂；在暗态下CdS/PbS/TiO₂复合材料储能效果良好，可延长对304不锈钢的阴极保护作用。

Preparation of Multicomponent Heterojunction CdS/PbS/TiO2 and its Photocathodic Protection Performance for 304SS

TiO₂ nanotubes arrays were prepared by anodic oxidation of Ti-plate, and then the TiO₂ nanotubes were co-modified with CdS and CdS via continuously layered ion deposition method assisted with ultrasonic vibration. The prepared multicomponent heterojunction CdS/PbS/TiO₂ was characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersion spectrum (EDS). The photoelectric properties of the photo anodic films were investigated by electrochemical method, in the same times, the photocathodic protection performance of the photo anodic films for 304 SS was assessed. The results show that CdS/PbS/TiO₂ multicomponent heterojunction presents good crystalline characteristics and surface morphology, indicating that the CdS/PbS/TiO₂ were prepared successfully. TiO₂ nanotubes arrays modified with 9 cycles of PbS-deposition and 15 cycles of CdS-deposition have better photoelectronic properties. The photocathodic protection performance of CdS/PbS/TiO₂ for 304 SS under illumination is significantly better than that of pure TiO₂ or PbS/TiO₂ films solely. It can be explained that the CdS/PbS/TiO₂ composite film gained excellent energy storage, therefore the cathodic protection life-time of the CdS/PbS/TiO₂ composite film for 304SS can be prolonged in the dark state.