Micro-Nano-Structured Fe2O3:Ti/ZnFe2O4 Heterojunction Films for Water Oxidation

被引：104

作者：

Miao, Chunhui

Ji, Shulin

Xu, Guoping

Liu, Guodong

Zhang, Lide

Ye, Changhui ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Solid State Phys, Anhui Key Lab Nanomat & Technol, Hefei 230031, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2012年 / 4卷 / 08期

基金：

中国国家自然科学基金;

关键词：

micro-nano-structure; Ti-doped hematite; heterojunction electrode; water oxidation; ZnFe2O4; electrochemical impedance; VISIBLE-LIGHT; PHOTOELECTROCHEMICAL PERFORMANCE; NANOSTRUCTURED HEMATITE; PASSIVE FILM; FEATURE SIZE; THIN-FILMS; ALPHA-FE2O3; PHOTOANODES; TI; PHOTOELECTROLYSIS;

D O I：

10.1021/am3011466

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Iron(III) oxide photoelectrodes show promise in water oxidation applications. In this study, micro-nano-structured hematite films are synthesized, and Ti ions are doped to improve photoelectric conversion efficiency. The photocurrent increases for enhanced electrical conductivity. Further enhanced photocurrent is achieved for Fe2O3:Ti/ZnFe2O4 heterojunction electrodes. Cyclic voltammograms combined with optical absorbance examinations demonstrate that the conduction and valence band edges of ZnFe2O4 shift from those of Ti doped Fe2O3 to the negative direction, which facilitates the efficient separation of electron-hole pairs at the Fe2O3:Ti/ZnFe2O4 interface. These findings demonstrate that, by doping hematite and by engineering the interface between the hematite and the electrolyte, charge separation can be effectively promoted and photocurrent density can be dramatically increased.

引用

页码：4428 / 4433

页数：6

共 39 条

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