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Reversed configuration of photocatalyst to exhibit improved properties of basic processes compared to conventional one
Science China Chemistry ( IF 9.6 ) Pub Date : 2020-05-07 , DOI: 10.1007/s11426-020-9752-x
Juhong Lian , Yu Qi , Yunfeng Bao , Zixi Yin , Yang Zhang , Nengcong Yang , Naijia Guan , Shengye Jin , Landong Li , Fuxiang Zhang

Performances of semiconductor photocatalysts are integrally determined by efficiencies of basic processes such as light absorption, charge separation and surface catalysis, but conventional configurations of photocatalysts normally suffers from the competition of light absorption originating from cocatalyst deposition and limited interface charge separation between the photocatalyst and cocatalyst. Herein we give the first proof-of-concept illustration that a reversed configuration of photocatalysts with a core/shell structure of microsized Mo2N cocatalysts and nanosized CdS photocatalysts, which exhibits superior solar hydrogen production to the conventional configuration with nanosized Mo2N cocatalysts deposited on the surface of CdS photocatalysts. It is revealed that the reversed configuration outperforms the conventional one in all areas of light absorption, charge separation and surface catalysis. Strikingly, the special core/shell structure introduced here can well avoid the competition of light absorption by cocatalysts and make an effective confinement effect to promote the surface catalysis of Mo2N. Our finding provides an alternative strategy to improve performances of photocatalysts.



中文翻译:

与常规催化剂相比,光催化剂的逆构型可显示出碱性工艺的改进性能

半导体光催化剂的性能完全由光吸收,电荷分离和表面催化等基本过程的效率决定,但是光催化剂的常规配置通常会遭受因助催化剂沉积而产生的光吸收竞争以及光催化剂与助催化剂之间有限的界面电荷分离的竞争。 。在本文中,我们提供了第一个概念证明,即具有微米级Mo 2 N助催化剂和纳米级CdS光催化剂的核/壳结构的光催化剂的反向构型,与传统的纳米级Mo 2构型相比,具有优异的太阳能产生能力N助催化剂沉积在CdS光催化剂的表面上。揭示了在光吸收,电荷分离和表面催化的所有领域中,反转构型优于常规构型。引人注目的是,此处介绍的特殊核/壳结构可以很好地避免助催化剂吸收光的竞争,并起到有效的限制作用,从而促进Mo 2 N的表面催化作用。我们的发现为提高光催化剂的性能提供了另一种策略。

更新日期:2020-05-07
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