NH_(4)F-(NH_(4))_(2)SO_(4)复合电解液中制备莲藕状TiO_(2)纳米管阵列及光生阴极保护性能研究  

Preparation of Lotus Root-like TiO_(2)Nanotube Arrays in NH_(4)F-(NH_(4))_(2)SO_(4)Composite Electrolyte and Its Photogenerated Cathodic Protection Performance

作　　者：王彤彤 张隽睿 高云 高荣杰[1] WANG Tongtong;ZHANG Juanrui;GAO Yun;GAO Rongjie(School of Materials Science and Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学材料科学与工程学院,青岛266100

出　　处：《中国腐蚀与防护学报》2024年第2期389-395,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金-山东省联合基金(U1706221)。

摘　　要：采用二次阳极氧化法在NH_(4)F-(NH_(4))_(2)SO_(4)复合电解液中制备近似莲藕状TiO_(2)纳米管阵列(TNTAs)。通过XRD、SEM、PL(光致发光光谱)等手段研究了不同阳极氧化电压下制备的TNTAs的结构、形貌以及光生载流子的分离率。同时,在模拟太阳光下,通过测试光生电流密度评估其光电化学性能,通过测试开路电位、Tafel极化电位和EIS拟合曲线评估对304SS的阴极保护效果。结果显示,当阳极氧化电压为25 V时,TNTAs莲藕状清晰,规整度较高,光生载流子分离率高,光生电流密度达到最高值为309.2μA·cm^(-2),开路电位达到最低值-0.986 V(vs.Ag/AgCl)时,对304SS的阴极保护效果较好。At present,TiO_(2),as a low-cost and non-polluting N-type semiconductor material,has been applied to photogenerated cathodic protection technology due to its excellent photoelectric conversion performance.In comparison with the ordinary nanotube arrays,the highly ordered lotus root-like TiO_(2)nanotube arrays(TNTAs)present much larger specific surface area and more effective photoreaction sites,which is conductive to enhancing the photoelectrochemical properties of TiO_(2)nanotube arrays.In this paper,lotus root-like TiO_(2)nanotube arrays were prepared by a two-step anodization process in NH_(4)F-(NH_(4))_(2)SO_(4)composite electrolyte.The effect of different anodization voltages on the performance of TiO_(2)nanotube photoanodes was studied.The structure,morphology and separation rate of photogenerated carriers of TNTAs prepared by different appllied anodic oxidation voltages were studied by XRD,SEM and photoluminescence spectra(PL).At the same time,under the irradiation of a simulated sunlight,the photoelectrochemical performance was evaluated by the photocurrent density measurement,and the cathodic protection effect of the photoanode on 304 stainless steel was evaluated by measurements of open circuit potential and Tafel polarization potential,as well as by fitting EIS curves.The results show that when the anodic oxidation voltage is 25 V,TNTAs have clear lotus root-like shape,high regularity,high photogenerated carrier separation rate and high photogenerated current density.Accordingly,the prepared TNTAs present lower open circuit potential,while better cathodic protection effect for 304 stainless steel substrates.

关 键 词：TiO_(2)纳米管 阳极氧化 光电化学 光生阴极保护 

分 类 号：TG172[金属学及工艺—金属表面处理]