NiSx Quantum Dots Accelerate Electron Transfer in Cd0.8Zn0.2S Photocatalytic System via an rGO Nanosheet “Bridge” toward Visible-Light-Driven Hydrogen Evolution
NiSx Quantum Dots Accelerate Electron Transfer in Cd0.8Zn0.2S Photocatalytic System via an rGO Nanosheet “Bridge” toward Visible-Light-Driven Hydrogen Evolution
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DOI：
10.1021/acscatal.7b04228
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发表时间：
2018-01
期刊：
影响因子：
12.9
通讯作者：
Chao Xue;He Li;Hua An;Bolun Yang;Jinjia Wei;Guidong Yang
中科院分区：
文献类型：
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作者：
Chao Xue;He Li;Hua An;Bolun Yang;Jinjia Wei;Guidong Yang
最小化电荷转移势垒以实现光激发电子-空穴对的快速空间分离对于大幅提高光催化剂的光催化产氢活性至关重要。在此，我们提出了一种电子转移策略，通过合理的设计和制造的高密度NiSx量子点（QD）作为一个高效的助催化剂的表面上的Cd0.8Zn0.2S/rGO纳米片复合材料。在可见光照射下，负载2wt% NiSx的二维（2D）Cd0.8Zn0.2S/rGO纳米杂化系统的表观量子效率（QE）为20.88%（435 nm），H2释放速率为7.84 mmol g-1 h-1，是Pt/Cd0.8Zn0.2S/rGO的1.4倍。据信，引入的rGO纳米片和NiSx量子点明显改善了界面电导率，并改变了该纳米结构中电子的空间分布。因此，界面连接的协同效应导致调节电子传递。
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 transporta...