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Bonnie

½ð³æ (ÕýʽдÊÖ)

[ÇóÖú] Çó·­ÒëһС¶ÎÓ¢ÎÄ ÒÑÓÐ2È˲ÎÓë

We developed a postgrowth modification method of two-dimensional WO3
nanoflakes by a simultaneous solution etching and reducing process in a weakly acidic condition.
The obtained dual etched and reduced WO3 nanoflakes have a much rougher surface, in which
oxygen vacancies are created during the simultaneous etching/reducing process for optimized
photoelectrochemical performance. The obtained photoanodes show an enhanced photocurrent
density of∼1.10 mA/cm2 at 1.0 V vs Ag/AgCl (∼1.23 V vs reversible hydrogen electrode), compared
to 0.62 mA/cm2 of pristine WO3 nanoflakes. The electrochemical impedance spectroscopy measurement
and the density functional theory calculation demonstrate that this improved performance of dual etched and reduced WO3 nanoflakes is
attributed to the increase of charge carrier density as a result of the synergetic effect of etching and reducing.
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wang342901

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