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

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• 作者：Chunhui Miao ; Shulin Ji ; Guoping Xu ; Guodong Liu ; Lide Zhang ; Changhui Ye
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：August 22, 2012
• 年：2012
• 卷：4
• 期：8
• 页码：4428-4433
• 全文大小：464K
• 年卷期：v.4,no.8(August 22, 2012)
• ISSN：1944-8252

文摘

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鈥揾ole 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.

Keywords:

micro-nano-structure; Ti-doped hematite; heterojunction electrode; water oxidation; ZnFe₂O₄; electrochemical impedance