Ultrathin hematite films deposited layer-by-layer on a TiO2 underlayer for efficient water splitting under visible light |
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Authors: | Chuangli Zhang Quanping Wu Xuebin Ke Juan Wang Xin Jin Song Xue |
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Affiliation: | 1. Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, Department of Applied Chemistry, Tianjin University of Technology, Tianjin, 300384, China;2. School of Electric Engineering, Tianjin University of Technology, Tianjin, 300384, China;3. School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, 4001, Australia |
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Abstract: | Ultrathin hematite (α-Fe2O3) film deposited on a TiO2 underlayer as a photoanode for photoelectrochemical water splitting was described. The TiO2 underlayer was coated on conductive fluorine-doped tin oxide (FTO) glass by spin coating. The hematite films were formed layer-by-layer by repeating the separated two-phase hydrolysis-solvothermal reaction of iron(III) acetylacetonate and aqueous ammonia. A photocurrent density of 0.683 mA cm−2 at +1.5 V vs. RHE (reversible hydrogen electrode) was obtained under visible light (>420 nm, 100 mW cm−2) illumination. The TiO2 underlayer plays an important role in the formation of hematite film, acting as an intermediary to alleviate the dead layer effect and as a support of large surface areas to coat greater amounts of Fe2O3. The as-prepared photoanodes are notably stable and highly efficient for photoelectrochemical water splitting under visible light. This study provides a facile synthesis process for the controlled production of highly active ultrathin hematite film and a simple route for photocurrent enhancement using several photoanodes in tandem. |
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Keywords: | Hematite film TiO2 underlayer Photoelectrochemical water splitting Visible light |
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