Performance Enhancement of ZnO Photocatalyst via Synergic Effect of Surface Oxygen Defect and Graphene Hybridization
Performance Enhancement of ZnO Photocatalyst via Synergic Effect of Surface Oxygen Defect and Graphene Hybridization
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DOI：
10.1021/la4001768
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发表时间：
2013-03-05
期刊：
影响因子：
3.9
通讯作者：
Zhu, Yongfa
中科院分区：
文献类型：
--
作者：
Bai, Xiaojuan;Wang, Li;Zhu, Yongfa
通过原位还原氧化石墨烯和ZnO 1-x表面缺陷氧化物制备了ZnO 1-x/石墨烯复合光催化剂。该复合光催化剂对亚甲基蓝的光催化降解表现出较好的光催化活性。ZnO 1-x的光腐蚀被石墨烯杂化成功地抑制。ZnO 1-x/石墨烯复合光催化剂与1.2wt%的石墨烯表现出最佳的光催化活性。ZnO 1-x/graphene-1.2wt%在可见光和紫外光下的光催化活性分别约为ZnO 1-x样品的4.6和1.2倍。ZnO 1-x在可见光和紫外光照射下的光电流强度可以通过石墨烯杂化提高2倍和3.5倍。ZnO_（1-x）/graphene光催化活性和光电流强度的提高主要归因于石墨烯和ZnO_（1-x）之间的协同效应，即ZnO_（1-x）/graphene中ZnO_（1-x）的O-i“”缺陷能级和石墨烯的HOMO轨道的促进导致了ZnO_（1-x）/graphene光生电子-空穴对的高效分离。
ZnO1-x/graphene hybrid photocatalyst was prepared via a facile in-situ reduction of graphene oxide and ZnO1-x surface defect oxide. The hybrid photocatlayst showed enhanced photocatalytic activity for the photodegradation of methylene blue. The photocorrosion of ZnO1-x was successfully inhibited by graphene hybridation. ZnO1-x/graphene hybrid photocatalyst with 1.2 wt % graphene showed the optimized photocatalytic activity. The photocatalytic activity of ZnO1-x/graphene-1.2 wt % under visible and UV light was about 4.6 and 1.2 times that of ZnO1-x sample, respectively. The photocurrent intensity of ZnO1-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 ZnO1-x/graphene was attributed to the synergistic effect between graphene and ZnO1-x for high separation efficiency of photoinduced electron-hole pairs mainly resulting from the promotion of HOMO orbit of graphene and the O-i '' defect level of ZnO1-x in ZnO1-x/graphene.