Performance Enhancement of ZnO Photocatalyst via Synergic Effect of Surface Oxygen Defect and Graphene Hybridization

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• 作者：Xiaojuan Bai ; Li Wang ; Ruilong Zong ; Yanhui Lv ; Yiqing Sun ; Yongfa Zhu
• 刊名：Langmuir
• 出版年：2013
• 出版时间：March 5, 2013
• 年：2013
• 卷：29
• 期：9
• 页码：3097-3105
• 全文大小：472K
• 年卷期：v.29,no.9(March 5, 2013)
• ISSN：1520-5827

文摘

ZnO_1鈥?i>x/graphene hybrid photocatalyst was prepared via a facile in-situ reduction of graphene oxide and ZnO_1鈥?i>x surface defect oxide. The hybrid photocatlayst showed enhanced photocatalytic activity for the photodegradation of methylene blue. The photocorrosion of ZnO_1鈥搙 was successfully inhibited by graphene hybridation. ZnO_1鈥?i>x/graphene hybrid photocatalyst with 1.2 wt % graphene showed the optimized photocatalytic activity. The photocatalytic activity of ZnO_1鈥?i>x/graphene-1.2 wt % under visible and UV light was about 4.6 and 1.2 times that of ZnO_1鈥?i>x sample, respectively. The photocurrent intensity of ZnO_1鈥?i>x under visible and UV light irradiation can be enhanced by 2 and 3.5 times by graphene hybridization. The enhancement of photocatalytic activity and photocurrent intensity in ZnO_1鈥?i>x/graphene was attributed to the synergistic effect between graphene and ZnO_1鈥?i>x for high separation efficiency of photoinduced electron鈥揾ole pairs mainly resulting from the promotion of HOMO orbit of graphene and the O_i鈥?defect level of ZnO_1鈥?i>x in ZnO_1鈥?i>x/graphene.