WO3 Nanoflakes for Enhanced Photoelectrochemical Conversion

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• 作者：Wenjie Li ; Peimei Da ; Yueyu Zhang ; Yongcheng Wang ; Xuan Lin ; Xingao Gong ; Gengfeng Zheng
• 刊名：ACS Nano
• 出版年：2014
• 出版时间：November 25, 2014
• 年：2014
• 卷：8
• 期：11
• 页码：11770-11777
• 全文大小：594K
• ISSN：1936-086X

文摘

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 鈭?.10 mA/cm² at 1.0 V vs Ag/AgCl (鈭?.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.

Keywords:

photoelectrochemical; WO₃; nanoflakes; etching; reducing; oxygen vacancy