(南京工業(yè)大學(xué) 化學(xué)化工學(xué)院，南京 210009)
摘 要: 采用溶膠凝膠法在導(dǎo)電玻璃上制備K2Ti6O13薄膜，考察焙燒溫度對(duì)薄膜結(jié)構(gòu)和光催化、光電化學(xué)行為的影響。采用XRD和AFM測(cè)定晶體和表面結(jié)構(gòu)；以自組裝在薄膜表面的十八烷基三氯硅烷(OTS)為光催化降解對(duì)象，評(píng)價(jià)K2Ti6O13薄膜光催化氧化性能；通過計(jì)時(shí)電位，循環(huán)伏安和光電流表征薄膜中光生載流子行為。結(jié)果表明，合適的結(jié)晶度和晶粒尺寸的匹配使500 ℃焙燒的K2Ti6O13薄膜具有較高的載流子激發(fā)、分離和遷移能力，體現(xiàn)出最高的光催化氧化能力和最大的光電流，光催化性能優(yōu)于TiO2薄膜。由光電測(cè)試計(jì)算得其在254 nm光照下光電量子效率約為6.9%
關(guān)鍵字: 六鈦酸鉀薄膜；光催化；光電化學(xué)
（College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China）
Abstract:The potassium hexatitanate thin films on ITO glasses substrates were prepared by sol-gel method, and was calcined at different temperatures. The structure and surface morphology of the K2Ti6O13 film were examined by XRD and AFM, respectively. The photocatalytic activity of the K2Ti6O13 film was evaluated by the degradation of partial coverage of octadecyltrichlorosilane (OTS) grafted on K2Ti6O13 film, and the behaviour of photogenerated carrier was characterized by chronopotentiometry, cyclic voltammetry and chronoamperometry. The results show that the K2Ti6O13 film calcined at 500 ℃ has the highest photocatalytic activity and the highest photocurrent, it is even superior to TiO2. The reason that K2Ti6O13 film calcined at 500 ℃ has the higher performance may be appropriate crystallinity, lesser grain size and large specific surface area, and the quantum yield illuminated under 254 nm laser source is 6.9%
Key words: potassium hexatitanate film; photocatalysis; photoelectrochemical property
