AgBiS2/TiO2纳米复合材料的制备及其光生阴极保护性能研究

Preparation of AgBiS2/TiO2 Nanocomposite and Evaluation of Its Photoelectrochemical Cathodic Protection Performance

为了开发一种更加清洁、高效、价廉、低耗能的阴极防护材料,通过电化学阳极氧化法和连续离子层吸附反应法制备了一种AgBiS2/TiO2纳米管阵列复合物材料。采用X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电镜(SEM)和紫外-可见漫反射(UV-vis DRS)分别表征了复合材料的化学组成、表面形貌以及光学吸收性能;通过电流密度、开路电位、Tafel极化曲线评价了AgBiS2/TiO2纳米管阵列薄膜复合材料的光电转化性能和光生阴极保护性能。结果表明:AgBiS2修饰TiO2纳米管阵列后的复合物薄膜,可见光照下表现出优异的光电化学性能,304不锈钢的开路电位从-183 mV(vs SCE,下同)降至约-950 mV,闭光后,电极电位可在-800 mV保持12 h以上。与纯TiO2纳米阵列薄膜相比,AgBiS2/TiO2纳米复合物薄膜对304不锈钢在3.5%(质量分数)NaCl腐蚀介质中具有更优异的光生阴极保护效果。

In order to develop a kind of cathodic protection composites with the performance of clean,efficient,cheap and low consumption,AgBiS2/TiO2 nanotube array composite nano-materials were prepared by electrochemical anodization and successive ionic layer adsorption/reaction.Moreover,X-ray diffraction(XRD),X-ray photoelectron spectrum(XPS),scanning electron microscope(SEM)and UV-visible diffuse reflection(UV-Vis DRS)were employed to characterize the chemical composition,surface morphology and light absorption response of the composites.Furthermore,the photo-induced cathodic protection effect of pure TiO2 nanoarray film and AgBiS2/TiO2 nanocomposite film on304 stainless steel was evaluated by measuring current density time curve,open circuit potential time curve and Tafel polarization curve.Results showed that after the modification of AgBiS2 on TiO2 nanotube arrays,the as-prepared composite film performed excellent photochemical properties under the lighting conditions.The open circuit potential of 304 stainless steel decreased from-183 mV(vs SCE)to-950 mV,and the electrode potential could be controlled to-800 mV for more than 12 h.In the comparison of pure TiO2 nanotube arrays,the composite film had a more excellent photocathode protection effect on 304 stainless steel in 3.5%NaCl solution.