期刊
NANO ENERGY
卷 22, 期 -, 页码 310-318出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2016.02.013
关键词
Hematite; Pseudobrookite; Band alignment; Impedance spectroscopy; Water splitting; Photoelectrochemical Cell
类别
资金
- NTU Start Up Grant Nanomaterials for Energy Harvesting [M4080297]
We have constructed a Fe2O3/Fe2TiO5 heterojunction based photoanode deposited on Fluorine Doped Tin Oxide (FTO) substrate by initially fabricating hematite (Fe2O3) nanorods and subsequently pseudobrookite (Fe2TiO5) nanoporous thin film on top of them. Comparatively lower annealing temperature of 650 degrees C (usually 750 degrees C or above) was used to avoid degradation of FTO. The crystalline Fe2O3/Fe2TiO5 heterojunction shows a considerable enhancement in photocurrent density ca. 1.4 mA/cm(2) and high surface charge separation efficiency of 85% at operating voltage of 1.23 V vs RHE as compared to its constituents. The crystalline heterojunction showed overall improvement in performance due to enhanced charge separation owing to the favorable band alignment with Fe2O3 nanorods and efficient injection of photogenerated holes through surface states into the electrolyte observed through Electrochemical Impedance Spectroscopy. (C) 2016 Published by Elsevier Ltd.
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