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罗马里奥

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[资源] Nature Communications最新光催化文章——二维双面神双层异质结原子水平控制电荷流动

长江学者、国家杰出青年科学基金获得者华中师范大学张礼知教授在Nature Communications上发表了一篇名为“Superior visible light hydrogen evolution of Janus bilayer junctions via atomic-level charge flow steering”的光催化研究论文。该文章通过把金属相MoS2单层选择性化学组装在单层Bi12O17Cl2的[Bi12O17]层来设计合成具有独特二维形貌的[Cl2]-[Bi12O17]-[MoS2]双面神双层异质结。以上所设计合成的二维双面神双层异质结可以精确控制电荷从电子空穴分离点到电荷消耗点的整个流动过程。在所组装的二维双层异质结中，单层Bi12O17Cl2的内电场首先驱动分离后电子和空穴分别到[Bi12O17]层和[Cl2]层，[Bi12O17]层的电子随后沿着界面Bi-S键转移到单层MoS2单层上驱动产氢反应，而滞留在[Cl2]层的空穴则氧化有机空穴牺牲剂而被消耗。由于二维形貌的双层异质结可以高度分离电子空穴，光生载流子的寿命高达3446 ns，以抗坏血酸为空穴捕获剂而构筑的可见光光催化体系的产氢速率高达33 mmol h-1 g-1。

文章链接为http://www.nature.com/ncomms/201 ... ll/ncomms11480.html

期刊：
Nature Communications
doi:10.1038/ncomms11480
Received 11 December 2015 Accepted 31 March 2016 Published 09 May 2016
题目：
Superior visible light hydrogen evolution of Janus bilayer junctions via atomic-level charge flow steering
作者：
Jie Li, Guangming Zhan, Ying Yu & Lizhi Zhang
摘要：
Although photocatalytic hydrogen evolution (PHE) is ideal for solar-to-fuel conversion, it remains challenging to construct a highly efficient PHE system by steering the charge flow in a precise manner. Here we tackle this challenge by assembling 1T MoS2 monolayers selectively and chemically onto (Bi12O17) end-faces of Bi12O17Cl2 monolayers to craft two-dimensional (2D) Janus (Cl2)-(Bi12O17)-(MoS2) bilayer junctions, a new 2D motif different from van der Waals heterostructure. Electrons and holes from visible light-irradiated Bi12O17Cl2 are directionally separated by the internal electric field to (Bi12O17) and (Cl2) end-faces, respectively. The separated electrons can further migrate to MoS2 via Bi–S bonds formed between (Bi12O17) and MoS2 monolayers. This atomic-level directional charge separation endows the Janus bilayers with ultralong carrier lifetime of 3,446 ns and hence a superior visible-light PHE rate of 33 mmol h−1 g−1. Our delineated Janus bilayer junctions on the basis of the oriented assembly of monolayers presents a new design concept to effectively steer the charge flow for PHE.

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Nature Communications最新光催化文章——二维双面神双层异质结原子水平控制电荷流动-1

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Nature Communications最新光催化文章——二维双面神双层异质结原子水平控制电荷流动-2

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Nature Communications最新光催化文章——二维双面神双层异质结原子水平控制电荷流动-3

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附件 1 : 2016-ncomms11480-Superior_visible_light_hydrogen_evolution_of_Janus_bilayer_junctions_via_atomic-level_charge_flow_steering.pdf

2016-05-09 19:34:35, 2.49 M