纳米片
光催化
量子点
材料科学
电子转移
纳米技术
量子效率
分解水
化学工程
电子
载流子
化学物理
光化学
光电子学
化学
催化作用
物理
量子力学
生物化学
工程类
作者
Chao Xue,He Li,Hua An,Bolun Yang,Jinjia Wei,Guidong Yang
标识
DOI:10.1021/acscatal.7b04228
摘要
Minimizing the charge transfer barrier to realize fast spatial separation of photoexcited electron–hole pairs is of crucial importance for strongly enhancing the photocatalytic H2 generation activity of photocatalysts. Herein, we propose an electron transfer strategy by reasonable design and fabrication of high-density NiSx quantum dots (QDs) as a highly efficient cocatalyst on the surface of Cd0.8Zn0.2S/rGO nanosheet composites. Under visible-light irradiation, the formation of a two-dimensional (2D) Cd0.8Zn0.2S/rGO nanohybrid system with 2 wt % NiSx loading gave a prominent apparent quantum efficiency (QE) of 20.88% (435 nm) and H2 evolution rate of 7.84 mmol g–1 h–1, which is 1.4 times higher than that of Pt/Cd0.8Zn0.2S/rGO. It is believe that the introduced rGO nanosheets and NiSx QDs obviously improved the interfacial conductivity and altered the spatial distribution of electrons in this nanoarchitecture. Thus, the synergistic effects of interfacial junctions result in a regulated electron transportation pathway along the basal planes and ultrafast transfer and spatial separation of photoexcited carriers, which are responsible for the enhanced photocatalytic performance. This work gives a facile and effective strategy to understand and realize rationally designed advanced photocatalysts for high-efficiency, stable, and cost-efficient solar hydrogen evolution applications.
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