电解质对TiO_2纳米管阵列膜光生阴极保护效应的影响  

Influence of Electrolytes on the Photocathodic Protection Effect of TiO_2 Nanotube Films for Stainless Steel

作　　者：张娟[1] 朱燕峰[1] 郭亚[1] 徐璐[1] 漆海清[1] 周剑章[1] 杜荣归[1] 林昌健[1] 

机构地区：[1]厦门大学化学化工学院化学系,固体表面物理化学国家重点实验室,厦门361005

出　　处：《高等学校化学学报》2013年第10期2408-2414,共7页Chemical Journal of Chinese Universities

基　　金：国家高技术研究发展专项基金(批准号:2009AA03Z327);国家自然科学基金(批准号:21073151;21173177和21021002)资助

摘　　要：基于光电化学测试考察了光电解池中电解质(NaNO3,NaCl,Na2SO4,Na2S和NaOH)的种类和浓度对阳极氧化法制备的锐钛矿型TiO2膜电极光电性能的影响,并解释了其作用机理.结果表明,电解质捕获空穴的能力顺序为Na2S>NaOH>Na2SO4>NaCl>NaNO3.Na2S和NaOH在溶液中具有协同作用,当两者组成混合溶液并且浓度均为0.5 mol/L时,更有利于TiO2膜光生电子-空穴对的分离和光电转化性能的提高.当0.5 mol/L NaCl溶液中的403不锈钢(403SS)与0.5 mol/L Na2S+0.5 mol/L NaOH混合溶液中的TiO2膜电极耦连时,光照膜电极可使403SS的电极电位负移约650 mV,具有良好的光生阴极保护效应.当切断光源时,在该混合液中TiO2膜也能对403SS起到一定的阴极保护作用.The effect of the concentration and the variety of electrolytes （NaNO3, NaC1, Na2SOo, Na2S, NaOH） in a photoelectrolytic cell on photoelectrochemical properties of a TiO2 nanotube film prepared by an anodic oxidation method was studied by photoelectrochemical measurements. The results show that the trend of different electrolytes for capturing photogenerated holes is Na2 S 〉 NaOH 〉 Na2 SO4 〉 NaC1 〉 NaNO3. Due to the synergistic effect of Na2S and NaOH in a solution, when the concentrations of NaES and NaOH were both 0. 5 mol/L, the photogenerated electron-hole pairs could be more effectively separated. The potential of 403 stain less steel in a 0.5 moL/L NaC1 solution coupled with the TiO2 film electrode in a 0. 5 mol/L Na2S＋0. 5 mol/L NaOH solution decreased by 650 mV under white-light irradiation, indicating the film could provide a good photocathodic protection effect on the steel by the assistance of the electrolyte solution. After the light was cut off, the 403 stainless steel also could be protected to a certain extent by the TiO2 film.

关 键 词：TiO2纳米管阵列膜 电解质 空穴捕获剂 光生阴极保护 

分 类 号：O646[理学—物理化学]