无定形纳米Fe_2O_3微粒的光电化学特性  

Studies on the Photoelectrochemisy of Amorphous Fe 2O 3 Particulate Films

作　　者：钱新明[1] 吕红辉[1] 张昕彤[1] 李英顺[1] 白玉白[1] 李铁津 汤心颐[1] 

机构地区：[1]吉林大学化学系,长春130023

出　　处：《吉林大学自然科学学报》1999年第2期87-92,共6页Acta Scientiarum Naturalium Universitatis Jilinensis

摘　　要：用强迫水解的方法制备粒径为５ ｎｍ 的无定形 Ｆｅ２ Ｏ３ 微粒， 并用滴膜的方法制备 Ｉ Ｔ Ｏ／ Ｆｅ２ Ｏ３ 电极． 在 Ｋ Ｃｌ， Ｎａ２ Ｓ Ｏ４， Ｎａ Ｏ Ｈ 电解质溶液中研究这种电极的光电化学特性． 同时对光生载流子在 Ｆｅ２ Ｏ３ 膜／电解质溶液界面的传递过程进行讨论． 根据紫外可见吸收特性及光电流的产生电位实验数据绘制了无定形 Ｆｅ２ Ｏ３ 的能级示意图．Amorphous Fe 2O 3 colloid was prepared by the forced hydrolysis method and its films were fabricated on ITO electrodes by dropping technique. The photoelectrochemical properies of ITO/Fe 2O 3 electrodes were investigated in 0.5 mol/L KCl, 1 mol/L Na 2SO 4 and 1 mol/L NaOH solutions, in which the anodic current onset potentials were 0.75 V, 0.75 V and 0.6 V respectively. The band gap of amorphous Fe 2O 3 was 2.18 eV obtained from the UV vis absorption spectrum. In the amorphous Fe 2O 3 particulate films/electrolyte system, the photo induced holes transfered to the electrolyte and oxidized a species in the solution, while the excited electrons moved in the direction toward the ITO electrode, which caused the anodic current. On the other hand, some photo induced electrons also transfered to the electrolyte to cause cathodic current in the direction of voltage reverse scan.

关 键 词：纳米微粒 无定形 光电化学 三氧化二铁 半导体 

分 类 号：O649.4[理学—物理化学] O48[理学—化学]