掺杂Cu^(2+)对钙钛矿型LaFeO_3光催化分解水制氢性能的影响

Effect of Doping Cu^(2+) on Photocatalytic Activity of Perovskite Oxides LaFeO_3 for Hydrogen Evolution from Water

利用柠檬酸法制备了系列钙钛矿型复合氧化物LaFe1-xCuxO3(x=0~0.07),通过XRD、TEM、UV-VIS DRS、XPS和PLS等表征手段对其晶相结构、形貌、吸光特性和表面性质进行了表征,并结合光催化分解水反应评价了其产氢活性.结果表明:柠檬酸法制得的钙钛矿型LaFeO3为纳米级材料,其在紫外-可见光区具有较宽的吸收带,掺杂Cu2+可增强对可见光的吸收;在紫外光的激发下,系列纳米钙钛矿型LaFe1-xCuxO3(x=0~0.07)具有一定的光催化分解水产氢活性,且掺杂Cu2+可在一定程度上提高产氢量,其掺杂的最佳摩尔分数为0.05.

Perovskite oxides LaFe1-xCuxO3 （x = 0-0.07） was prepared by a conventional citrate complex method. The structure, shape, particle size, the photon absorption performance and surface property of the prepared LaFe1-xCuxO3 （x=0-0.07）were investigated by using XRD, TEM, UV-VIS DRS, XPS and PLS techniques. Perovskite oxides LaFeO3 prepared is a kind of nano-sized material. Perovskite oxides LaFeO3 has the good absorption property in UV-visible region, and a series of Cu-doped LaFeO3 have more respondence to the visible light. Under UV light irradiation, H2can be produced by photocatalytic decomposing of water over the prepared LaFe1-xCuxO3（x=0-0.07）. Doping Cu^2＋ can enhance the photocatalytic activity of LaFeO3 to a certain extent, and the optimal doping molar fraction of catalyst is 0. 05.