纳米钙钛矿型复合氧化物LaFeO_3光催化分解水制氢  

Photocatalytic Hydrogen Evolution from Water over Nano Perovskite Oxides LaFeO_3

作　　者：桑丽霞[1] 刘宇[1] 李群伟[1] 胥利先[1] 马重芳[1] 戴洪兴[2] 何洪[2] 

机构地区：[1]北京工业大学传热强化与过程节能教育部重点实验室及传热与能源利用北京市重点实验室,北京100022 [2]北京工业大学环境与能源工程学院化工化学系,北京100022

出　　处：《中国稀土学报》2006年第z2期42-45,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家重点基础研究发展计划项目(2003CB214500)资助

摘　　要：利用柠檬酸络合法合成了钙钛矿型复合氧化物LaFeO3,利用XRD,SEM,TEM,XPS和UV-VIS DRS等表征手段分析了所制备材料的结构、形貌、粒径大小、表面物种和吸光性能。结果表明,所制备的LaFeO3具有完好的钙钛矿型结构,粒子大小均匀,其粒径为40 nm左右,表面上Fe3+和Fe2+共存,且活性吸附氧种占57.25%。所制备的LaFeO3在400~700 nm的可见光区具有明显的吸收带,其能隙为2.16 eV。通过紫外光的激发,在草酸的耦合作用下,纳米LaFeO3上发生光分解水产氢反应,其平均产氢速率达到718.2μmol.h-1.g-1。Perovskite oxides LaFeO_3 was prepared by conventional citrate complex method.The structure,shape,particle size,surface species and the photon adsorption property of the prepared LaFeO_3 were investigated by using XRD,SEM,TEM,XPS and UV-VIS DRS technique.The particle of perovskite oxides LaFeO_3 is well-sized and about 40 nm.Nano LaFeO_3 has the good adsorption property in visible region,which responds to the energy gap of 2.16 eV.Under UV light irradiation,H_2 can be produced by photocatalytic decomposing of water over nano LaFeO_3 with the presence of electron donors,H_2C_2O_4,which has the H_2 evolution even rate of 2339.1 μmol·h^(-1)·g^(-1).The photocatalytic activity of LaFeO_3 not only attributes to the action of H_2C_2O_4 but also depends on the surface Fe^(3+)-Fe^(2+) and adsorbs oxygen species.

关 键 词：LAFEO3 柠檬酸络合法 光催化 氢 稀土 

分 类 号：O64[理学—物理化学]