Photoelectrochemical properties of tungsten trioxide thin film electrodes prepared from facet-controlled rectangular platelets |
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| Authors: | Amano Fumiaki Tian Min Ohtani Bunsho Chen Aicheng |
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| Institution: | (1) Catalysis Research Center, Hokkaido University, Sapporo 001-0021, Japan;(2) Present address: Department of Chemical and Environmental Engineering, University of Kitakyushu, Kitakyushu 808-0135, Japan;(3) Department of Chemistry, Lakehead University, Thunder Bay, Ontario, P7B 5E1, Canada |
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| Abstract: | The control of anisotropic crystal growth is critical for directing the orientation of crystal lattice planes, and it plays
a key role towards understanding the effects of different planes on chemical reactions. Here, we report on the photoelectrochemical
properties of plate-structured tungsten trioxide (WO3) thin films prepared from facet-controlled rectangular platelets of hydrotungstite (WO3·2H2O) and tungstite (WO3·H2O), which are directly grown on tungsten substrates. The WO3 thin films, prepared via WO3·2H2O platelets, show relatively stable current for photoelectrochemical water splitting and methanol oxidation. On the other
hand, the photocurrent of the WO3 thin films prepared via WO3·H2O platelets was significantly decreased during the photoelectrochemical oxidation of water, which is likely due to the accumulation
of partially oxidized intermediates such as peroxo species on the surface. These results indicate that the surface nanostructures
of WO3 may have a significant influence on photoelectrode efficiency and selectivity for the catalytic oxygen evolution reaction. |
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