Simultaneously Efficient Solar Light Harvesting and Charge Transfer of Hollow Octahedral Cu2S/CdS p–n Heterostructures for Remarkable Photocatalytic Hydrogen Generation
Simultaneously Efficient Solar Light Harvesting and Charge Transfer of Hollow Octahedral Cu2S/CdS p–n Heterostructures for Remarkable Photocatalytic Hydrogen Generation
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DOI：
10.1007/s12209-021-00291-x
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发表时间：
2021-05
影响因子：
7.1
通讯作者：
Yanting Zhang;Lei Ran;Zhuwei Li;Panlong Zhai;Bo Zhang;Zhaozhong Fan;Chen Wang;Xiaomeng Zhang-Xiaomeng-Z
中科院分区：
文献类型：
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作者：
Yanting Zhang;Lei Ran;Zhuwei Li;Panlong Zhai;Bo Zhang;Zhaozhong Fan;Chen Wang;Xiaomeng Zhang-Xiaomeng-Z
太阳能驱动的水分解是工业制氢的一个有前途的替代方案。本研究报告了一个精心设计和合成的集成硫化镉（CdS）量子点和硫化亚铜（Cu 2S）纳米片作为三维（3D）中空八面体Cu 2S/CdS p-n异质结构的架构，通过一个通用的模板和一锅硫化策略。3D分级中空纳米结构可以加强太阳光的多次反射，为光催化分解水提供大的比表面积和丰富的反应位点。由于p-n异质结构的构建是一种理想的催化模型，在Cu 2S/CdS界面处具有高度匹配的能带排列，出现的内电场可以促进CdS和Cu 2S之间的空间分离和光激发电荷的转移，也可以增强电荷动力学并延长电荷寿命。值得注意的是，独特的中空Cu 2S/CdS结构提供了大大增强的可见光驱动的氢气生成速率为4.76 mmol/（g·h），这分别是原始CdS和Cu 2S催化剂的近8.5倍和476倍。这一工作不仅为空心光催化剂的合理设计和制备奠定了基础，而且阐明了独特的异质结构在太阳能转换光催化剂中的关键作用。
Solar-driven water splitting is a promising alternative to industrial hydrogen production. This study reports an elaborate design and synthesis of the integration of cadmium sulfide (CdS) quantum dots and cuprous sulfide (Cu2S) nanosheets as three-dimensional (3D) hollow octahedral Cu2S/CdS p–n heterostructured architectures by a versatile template and one-pot sulfidation strategy. 3D hierarchical hollow nanostructures can strengthen multiple reflections of solar light and provide a large specific surface area and abundant reaction sites for photocatalytic water splitting. Owing to the construction of the p–n heterostructure as an ideal catalytic model with highly matched band alignment at Cu2S/CdS interfaces, the emerging internal electric field can facilitate the space separation and transfer of photoexcited charges between CdS and Cu2S and also enhance charge dynamics and prolong charge lifetimes. Notably, the unique hollow Cu2S/CdS architectures deliver a largely enhanced visible-light-driven hydrogen generation rate of 4.76 mmol/(g·h), which is nearly 8.5 and 476 times larger than that of pristine CdS and Cu2S catalysts, respectively. This work not only paves the way for the rational design and fabrication of hollow photocatalysts but also clarifies the crucial role of unique heterostructure in photocatalysis for solar energy conversion.