Water oxidation reaction promoted by MIL-101(Fe) photoanode under visible light irradiation |
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Authors: | Zakary Lionet Yusuke Kamata Shun Nishijima Takashi Toyao Tae-Ho Kim Yu Horiuchi Soo Wohn Lee Masaya Matsuoka |
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Institution: | 1.Department of Applied Chemistry, Graduate School of Engineering,Osaka Prefecture University,Sakai,Japan;2.Institute for Catalysis,Hokkaido University,Sapporo,Japan;3.Division of Mechanics and ICT Convergence Engineering,Sun Moon University,Asan,Republic of Korea;4.Department of Environmental and Bio-Chemical Engineering,Sun Moon University,Asan,Republic of Korea |
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Abstract: | This work spotlights the recently discovered photoelectrocatalytic properties of iron-based metal–organic frameworks (MOFs) for water oxidation reaction (WOR) under visible light irradiation. The low efficiency of WOR is one of the biggest difficulties faced by photoelectrochemical solar energy conversion; the development of new photoanodes for WOR is greatly desired. In view of the fact that a higher efficiency for WOR was forecast thanks to the peculiar properties of MOFs, such as a highly ordered framework and homogenous porous structure, the photoelectrodes based on MIL-101(Fe) containing photo-active iron(III) clusters have been fabricated by using a drop-casting method and applied to photoelectrochemical water oxidation as photoanodes. XRD measurements revealed the successful formation of MIL-101(Fe) electrodes while retaining their framework structures. From the results of photoelectrochemical measurements, the optimal thickness of the MIL-101(Fe) electrodes was determined to be ca. 60 μm, and the optimized MIL-101(Fe) electrode was found to promote photoelectrochemical WOR under visible light irradiation more efficiently than conventional α-Fe2O3 electrodes. Moreover, electrochemical impedance spectroscopy measurements demonstrated a lower resistance of charge transfer at the interface between the MOF surface and the electrolyte, resulting in better photoelectrochemical performance of the MIL-101(Fe) electrode. |
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