Enhanced Performance of Photoelectrochemical Water Splitting with ITO@伪-Fe2O3 Core鈥揝hell Nanowire Array as Photoanode

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• 作者：Jie Yang ; Chunxiong Bao ; Tao Yu ; Yingfei Hu ; Wenjun Luo ; Weidong Zhu ; Gao Fu ; Zhaosheng Li ; Hao Gao ; Faming Li ; Zhigang Zou
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：December 9, 2015
• 年：2015
• 卷：7
• 期：48
• 页码：26482-26490
• 全文大小：581K
• ISSN：1944-8252

文摘

Hematite (伪-Fe₂O₃) is one of the most promising candidates for photoelectrodes in photoelectrochemical water splitting system. However, the low visible light absorption coefficient and short hole diffusion length of pure 伪-Fe₂O₃ limits the performance of 伪-Fe₂O₃ photoelectrodes in water splitting. Herein, to overcome these drawbacks, single-crystalline tin-doped indium oxide (ITO) nanowire core and 伪-Fe₂O₃ nanocrystal shell (ITO@伪-Fe₂O₃) electrodes were fabricated by covering the chemical vapor deposited ITO nanowire array with compact thin 伪-Fe₂O₃ nanocrystal film using chemical bath deposition (CBD) method. The J鈥?i>V curves and IPCE of ITO@伪-Fe₂O₃ core鈥搒hell nanowire array electrode showed nearly twice as high performance as those of the 伪-Fe₂O₃ on planar Pt-coated silicon wafers (Pt/Si) and on planar ITO substrates, which was considered to be attributed to more efficient hole collection and more loading of 伪-Fe₂O₃ nanocrystals in the core鈥搒hell structure than planar structure. Electrochemical impedance spectra (EIS) characterization demonstrated a low interface resistance between 伪-Fe₂O₃ and ITO nanowire arrays, which benefits from the well contact between the core and shell. The stability test indicated that the prepared ITO@伪-Fe₂O₃ core鈥搒hell nanowire array electrode was stable under AM1.5 illumination during the test period of 40鈥?00 s.