Thylakoid-Inspired Multishell g-C3N4 Nanocapsules with Enhanced Visible-Light Harvesting and Electron Transfer Properties for High-Efficiency Photocatalysis
Thylakoid-Inspired Multishell g-C3N4 Nanocapsules with Enhanced Visible-Light Harvesting and Electron Transfer Properties for High-Efficiency Photocatalysis
复制标题
类囊体启发的多壳 g-C3N4 纳米胶囊具有增强的可见光捕获和电子转移特性，可实现高效光催化
DOI：
10.1021/acsnano.6b08251
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发表时间：
2017-01-01
期刊：
影响因子：
17.1
通讯作者：
Jiang, Zhongyi
中科院分区：
文献类型：
--
作者：
Tong, Zhenwei;Yang, Dong;Jiang, Zhongyi
受天然光合作用系统中类囊体有序堆积的纳米结构和高度集成的功能的启发，以不同壳层的SiO2硬模板制备了多壳层g-C3 N4（MSCN）纳米胶囊光催化剂。由于出色的可见光捕获和电子转移性能，所得三壳层g-C3 N4（TSCN）纳米胶囊显示出比单壳层和双壳层纳米胶囊更优越的上级光催化性能。特别是随着壳层层数的增加，捕光能力大大增强。由于多壳层纳米结构中入射光的多次散射和反射以及多孔薄壳层中的光透射，整个可见光范围的吸收增加，并且由于量子尺寸效应的减小而导致吸收边增加。TSCN的高比表面积（310.7 m（2）g（-1））和薄壳中的介孔作为纳米管道大大加速了电子传递。具有定制的分级纳米结构特征，TSCN表现出630 μ mol h（-1）g（-1）（λ> 420 nm）的上级可见光H-2产生活性，这是最有效的无金属g-C3 N4光催化剂之一。这项研究展示了一种生物启发的方法来合理设计高性能的纳米结构可见光光催化剂。
Inspired by the orderly stacked nanostructure and highly integrated function of thylakoids in a natural photosynthesis system, multishell g-C3N4 (MSCN) nano capsule photocatalysts have been prepared by SiO2 hard template with different shell layers. The resultant triple-shell g-C3N4 (TSCN) nanocapsules display superior photocatalysis performance to single-shell and double-shell counterparts owing to excellent visible-light harvesting and electron transfer properties. Specially, with the increase of the shell layer number, light harvesting is greatly enhanced. There is an increase of the entire visible range absorption arising from the multiple scattering and reflection of the incident light within multishell nanoarchitectures as well as the light transmission within the porous thin shells, and an increase of absorption edge arising from the decreased quantum size effect. The electron transfer is greatly accelerated by the mesopores in the thin shells as nanoconduits and the high specific surface area of TSCN (310.7 m(2) g(-1)). With the tailored hierarchical nanostructure features, TSCN exhibits a superior visible-light H-2-generation activity of 630 mu mol h(-1) g(-1) (lambda > 420 nm), which is among one of the most efficient metal-free g-C3N4 photocatalysts. This study demonstrates a bioinspired approach to the rational design of high-performance nanostructured visible-light photocatalysts.