Oxygen Vacancies Confined in Ultrathin Indium Oxide Porous Sheets for Promoted Visible-Light Water Splitting

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• 作者：Fengcai Lei ; Yongfu Sun ; Katong Liu ; Shan Gao ; Liang Liang ; Bicai Pan ; Yi Xie
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：May 14, 2014
• 年：2014
• 卷：136
• 期：19
• 页码：6826-6829
• 全文大小：337K
• 年卷期：v.136,no.19(May 14, 2014)
• ISSN：1520-5126

文摘

Finding an ideal model for disclosing the role of oxygen vacancies in photocatalysis remains a huge challenge. Herein, O-vacancies confined in atomically thin sheets is proposed as an excellent platform to study the O-vacancy鈥損hotocatalysis relationship. As an example, O-vacancy-rich/-poor 5-atom-thick In₂O₃ porous sheets are first synthesized via a mesoscopic-assembly fast-heating strategy, taking advantage of an artificial hexagonal mesostructured In-oleate complex. Theoretical/experimental results reveal that the O-vacancies endow 5-atom-thick In₂O₃ sheets with a new donor level and increased states of density, hence narrowing the band gap from the UV to visible regime and improving the carrier separation efficiency. As expected, the O-vacancy-rich ultrathin In₂O₃ porous sheets-based photoelectrode exhibits a visible-light photocurrent of 1.73 mA/cm², over 2.5 and 15 times larger than that of the O-vacancy-poor ultrathin In₂O₃ porous sheets- and bulk In₂O₃-based photoelectrodes.