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水热法制备了系列p-CoFe_2O_4/n-TiO_2复合光催化剂,采用XRD,UV-Vis DRS,SEM和Mott-Schottky分析对制备的光催化剂进行了结构和性能表征。研究了p-CoFe_2O_4/n-TiO_2复合光催化剂可见光催化分解水制氢性能。结果表明:由于CoFe_2O_4的导带电势比TiO_2的导带电势更负,以及CoFe_2O_4和TiO_2界面形成的p-n结所产生的内建电场的双重作用,使得CoFe_2O_4导带上的电子能迅速迁移到TiO_2的导带上,减少了电子-空穴对复合的概率,提高了光催化活性。
A series of p-CoFe 2 O 4 / n-TiO 2 composite photocatalysts were prepared by hydrothermal method. The prepared photocatalysts were characterized by XRD, UV-Vis DRS, SEM and Mott-Schottky analysis. The photocatalytic performance of p-CoFe 2 O 4 / n-TiO 2 composite photocatalysts for photocatalytic decomposition of water to hydrogen was studied. The results show that due to the double conduction between the conduction band potential of CoFe 2 O 4 and the conduction band potential of TiO 2 and the built-in electric field generated by the pn junction formed between the CoFe 2 O 4 and TiO 2 interface, the electrons on the CoFe 2 O 4 conduction band can rapidly migrate to TiO 2 The conduction band reduces the probability of electron-hole pair recombination and improves the photocatalytic activity.