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纳米钙钛矿型复合氧化物LaFeO₃光催化分解水制氢

Photocatalytic Hydrogen Evolution from Water over Nano Perovskite Oxides LaFeO₃

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【Author】 Sang Lixia~(1*),Liu Yu~1,Li Qunwei~1,Xu Lixian~1,Ma Chongfang~1,Dai Hongxing~2,He Hong~2 ((1.Key) Laboratory of Enhanced Heat Transfer and Energy Conservation,Ministry of Education and Key(Laboratory) of Heat Transfer and Energy Conversion,Beijing Education Commission,Beijing 100022,China;2.Department of Chemistry and Chemical Engineering,College of Energy and Environmental Engineering,Beijing University of Technology,Beijing 100022,China)

【机构】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；北京工业大学环境与能源工程学院化工化学系；北京工业大学环境与能源工程学院化工化学系北京100022；北京100022；

【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。更多还原

【Abstract】 Perovskite oxides LaFeO₃ was prepared by conventional citrate complex method.The structure,shape,particle size,surface species and the photon adsorption property of the prepared LaFeO₃ were investigated by using XRD,SEM,TEM,XPS and UV-VIS DRS technique.The particle of perovskite oxides LaFeO₃ is well-sized and about 40 nm.Nano LaFeO₃ has the good adsorption property in visible region,which responds to the energy gap of 2.16 eV.Under UV light irradiation,H₂ can be produced by photocatalytic decomposing of water over nano LaFeO₃ with the presence of electron donors,H₂C₂O₄,which has the H₂ evolution even rate of 2339.1 μmol·h^-1·g^-1.The photocatalytic activity of LaFeO₃ not only attributes to the action of H₂C₂O₄ but also depends on the surface Fe³⁺-Fe²⁺ and adsorbs oxygen species.更多还原