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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
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
