Insights into charge transfer and solar light photocatalytic activity induced by the synergistic effect of defect state and plasmon in Au nanoparticle-decorated hierarchical 3D porous ZnO microspheres
Insights into charge transfer and solar light photocatalytic activity induced by the synergistic effect of defect state and plasmon in Au nanoparticle-decorated hierarchical 3D porous ZnO microspheres
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深入了解金纳米颗粒修饰的分级 3D 多孔 ZnO 微球中缺陷态和等离子体激元协同效应诱导的电荷转移和太阳光光催化活性
DOI：
10.1016/j.apsusc.2019.07.257
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发表时间：
2019-11-15
影响因子：
6.7
通讯作者：
Fu, Junli
中科院分区：
文献类型：
--
作者：
Cheng, Ying;Wang, Wenzhong;Fu, Junli
本研究揭示了在Au纳米粒子修饰的分层三维多孔ZnO微球中，缺陷态和等离激元之间的协同效应诱导的电荷转移和太阳光催化活性。光致发光表明，ZnO的光生电子通过缺陷态和等离激元的耦合作用，从缺陷能级有效地转移到导带（CB）。与纯ZnO微球光催化剂相比，制备的Au/ZnO微球光催化剂在太阳光照射下对亚甲基蓝染料的分解活性显著增强。此外，通过调整Au纳米颗粒（NPs）的尺寸来控制Au/ZnO微球的光催化性能。在10 nm Au NPs修饰下，Au/ZnO微球光催化剂的速率常数分别是纯ZnO微球光催化剂（0.00378 min(-1)）和30 nm Au NPs修饰的Au/ZnO微球光催化剂（0.01154 min(-1)）的26倍和8.5倍。Au/ZnO微球光催化剂的光催化性能的增强归因于缺陷态-等离子体耦合诱导的光电生电子从缺陷能级到ZnO的CB的有效转移。本研究提高了对金属/半导体异质结构光催化剂中缺陷态-等离子体耦合引起的光催化活性增强的理解。
This study provides insights into the charge transfer and solar light photocatalytic activity induced by the synergistic effect between defect state and plasmon in Au nanoparticle-decorated hierarchical 3D porous ZnO microspheres. Photoluminescence emission shows that the photogenerated electrons of ZnO are efficiently transferred from its defect level to the conduction band (CB) induced through the coupling action of the defect state and plasmon. Compared with the pure ZnO microsphere photocatalysts, the fabricated Au/ZnO microsphere photocatalysts show remarkably enhanced activity for the decomposition of methylene blue dyes under solar-light illumination. Moreover, the photocatalytic performance of the Au/ZnO microspheres was manipulated by tuning the size of the Au nanoparticles (NPs). When decorated with 10 nm Au NPs, the Au/ZnO microsphere photocatalyst achieves a rate constant of 0.09846 min(-1), 26 and 8.5 times higher than those of the pure ZnO microsphere photocatalysts (0.00378 min(-1)) and the Au/ZnO microsphere photocatalysts decorated with 30 nm Au NPs (0.01154 min(-1)), respectively.. The enhanced photocatalytic performance of the Au/ZnO microsphere photocatalysts is ascribed to the defect state-plasmon coupling-induced efficient transfer of photogenerated electrons from the defect level to the CB of ZnO. This work enhances the understanding of the defect state-plasmon coupling-induced enhanced photocatalytic activity in metal/semiconductor heterostructure photocatalysts.