Crystal Faces of Cu2O and Their Stabilities in Photocatalytic Reactions

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• 作者：Zhaoke Zheng ; Baibiao Huang ; Zeyan Wang ; Meng Guo ; Xiaoyan Qin ; Xiaoyang Zhang ; Peng Wang ; Ying Dai
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：August 13, 2009
• 年：2009
• 卷：113
• 期：32
• 页码：14448-14453
• 全文大小：329K
• 年卷期：v.113,no.32(August 13, 2009)
• ISSN：1932-7455

文摘

Cu₂O microcrystals with well-formed facets were synthesized by a simple hydrothermal method. The surface stabilities and photocatalytic properties of Cu₂O microcrystals were systematically investigated. Cu₂O {100} and {110} facets gradually disappear and transform into nanosheets during the photodegradation of methyl orange (MO) dye. With the increase of irradiation time, Cu₂O microcrystals completely transform into nanosheets with {111} facets. The finally formed nanosheets exhibit stable photocatalytic activities. On the basis of both experimental analysis and theoretical calculations, a novel model of charge separation among crystal faces was proposed and the morphology transformation mechanism accompanied by MO bleaching was discussed. It is concluded that Cu₂O exposing {111} facets can be used as a stable photocatalyst.