摘要
通过超声辅助连续离子层吸附和反应法在TiO_(2)纳米管上负载CdS和Bi_(2)S_(3),通过SEM、XRD、XPS等手段对材料的形貌、结构、元素组成和价态进行表征,在模拟太阳光下,系统研究TiO_(2)纳米复合材料的电化学性能。结果表明,负载CdS和Bi_(2)S_(3)的TiO_(2)纳米复合材料的光吸收范围扩展到可见光区,载流子的复合率也大大降低,光电流密度提升至850μA·cm-2,是改性前的3.4倍;将其与304不锈钢耦合后,电位降至-0.99 V,比改性前的耦合电位低约70 mV,可以进一步提升对304不锈钢的光生阴极保护效果。
TiO_(2)nanotube arrays are decorated with CdS and Bi_(2)S_(3)by an ultrasonic-assisted successive ionic layer adsorption and reaction(SILAR)method aiming to enhance thephotoelectric conversion ability of TiO_(2)and correspondingly the photogenerated cathodic protection performance for 304 stainless steel.The morphology,structural,element type and valence state of the TiO_(2)nanocomposites are characterized by SEM,XRD and XPS,the photoelectrochemical performance of nanocomposites is studied systematically under irradiation of a simulated sunlight.The results indicate that the TiO_(2)nanocomposites decorated with proper amount of CdS and Bi_(2)S_(3)by an optimal procedure exhibit the best performance,namely,the band gap is reduced to 2.4 eV,the light absorption range extends to the visible region,and the recombination rate of charge photogenerated carriers is greatly reduced.The electrochemical test results show that Bi_(2)S_(3)/CdS/TiO_(2)nanocomposites have the lowest charge transfer resistance and the fastest electron transfer rate,and the photocurrent density is enhanced to 850μA·cm-2 under the condition of turning on light,which is 11.8%higher than that of CdS/TiO_(2)nanocomposites and 3.4 times that of TiO_(2)nanotube arrays.After coupling the nanocomposite with 304 stainless steel,the potential can be reduced to-0.99 V under simulated sunlight,which is about 70 mV lower than that with the undecorated TiO_(2)nanocomposites,and it can further enhance the photogenerated cathodic protection effect on 304 stainless steel.
作者
叶梦颖
于佳汇
王彤彤
高荣杰
YE Mengying;YU Jiahui;WANG Tongtong;GAO Rongjie(School of Materials Science and Engineering,Ocean University of China,Qingdao 266100,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2024年第2期372-380,共9页
Journal of Chinese Society For Corrosion and Protection
