柠檬酸络合法制备质子化层状钙钛矿K_(0.5)La_(0.5)Bi_2Ta_2O_9及其光解水制氢性能  

Polymerizable Complex Synthesis of Protonated Form of Layered Perovskite K_(0.5)La_(0.5)Bi_2Ta_2O_9 for Water Splitting into Hydrogen

作　　者：陈威[1] 高寒阳[1] 杨俞[1] 林培宾[1] 袁坚[1] 上官文峰[1] 苏佳纯 孙洋洲 

机构地区：[1]上海交通大学燃烧与环境技术中心,上海200240 [2]中海油新能源投资有限责任公司,北京100016

出　　处：《物理化学学报》2012年第12期2911-2916,共6页Acta Physico-Chimica Sinica

基　　金：国家重点基础研究发展规划项目(973) (2009CN220000);国家自然科学基金(20973110)资助~~

摘　　要：采用柠檬酸络合法制备铋层钙钛矿K0.5La0.5Bi2Ta2O9(KLBT),通过酸化处理得到质子化层状钙钛矿H1.9K0.3La0.5Bi0.1Ta2O7(HKLBT)光催化剂,并通过热重-差热(TG-DSC)、X射线衍射(XRD)、紫外-可见漫反射(DRS)、X射线光电子能谱(XPS)等技术对其进行了表征和分析.考察了前驱体KLBT的不同焙烧温度对HKLBT制氢活性的影响.结果表明,柠檬酸络合法能在较低温度下合成高结晶度纯相HKLBT,前驱体经900°C焙烧制备的HKLBT催化剂活性最高,在纯水中的产氢速率达236.6μmol·h-1;长时间活性测试表明HKLBT具有完全分解水并同时产氢产氧能力,且具有较好的稳定性.The protonated layered perovskite oxide H1.9K0.3La05Bi0.1Ta2O7 （HKLBT） was prepared from K0.5La0.5Bi2Ta2O9 （KLBT） by H ion-exchange, and subsequently characterized by thermogravimetric analysis （TG-DSC）, X-ray diffraction （XRD）, UV-Vis diffuse reflectance spectroscopy （DRS）, and X-ray photoelectron spectroscopy （XPS）. The effects of the calcining temperature on the material＇s photocatalytic activity were also investigated. Results showed that HKLBT with high crystalline quality could be synthesized at low temperatures and that HKLBT prepared from KLBT calcined at 900 ℃ exhibited the greatest photocatalytic activity, with an average water splitting hydrogen evolution rate of 236.6 μmol. h-1 in pure water. The time course of water splitting indicated HKLBT has ability to split water into hydrogen and oxygen with long-term stability.

关 键 词：光催化 水分解 层状钙钛矿 酸化 

分 类 号：O643.36[理学—物理化学] TQ116.2[理学—化学]