表面等离子体光催化材料

Plasmonic Photocatalyst

以太阳能为直接驱动力的光催化技术能将低密度的太阳能有效地转化为高密度的化学能,对于解决当前严峻的能源短缺和环境污染问题,起着越来越重要的作用。然而,传统的TiO2光催化材料由于其较宽的禁带宽度,仅能吸收紫外光,不能有效利用太阳能,因此,可见光响应催化剂的研制是实现太阳能高效利用的关键。除了阴离子掺杂,阳离子掺杂,共掺杂,晶面控制,构建异质结构和表面非晶化等方法,将表面等离子体共振与光催化相结合的表面等离子体光催化材料,作为一种新颖的增强可见光光催化性能的材料,自2008年被提出以来受到了研究者的广泛关注。对于表面等离子体光催化材料,一般均是将贵金属纳米颗粒负载在半导体载体表面,因此,理解不同金属纳米颗粒和载体对金属与载体间界面及相应的光催化活性的影响至关重要。本文从表面等离子体光催化材料负载的贵金属和载体的角度,综述了近年来该领域取得的一些重要进展,注重于探讨表面等离子体光催化材料的催化机理,并对今后的研究工作进行了展望。

Photocatalysis, which can convert low density solar energy into high density chemical energy by direct utilization of solar energy, plays more and more important roles in solving current urgent energy shortage and environmental pollution issues. However, traditional photocatalyst TiO2 with large band gap which can only absorb UV light limits its practical applications in the case of natural solar light, so exploiting visible light driven photocatalysts is the most important topic to utilize solar energy efficiently. Compared to anion doping, cation doping, co-doping, crystal facets control, heterjunction fabrication and surface amorphous, as a novel approach to enhance the visible light driven photocatalytic performance, plasmonic photocatalyst which can combine the advantages of both surface plasmon resonance and photocatalysis has been extensively studied since it was firstly reported in 2008. For plasmonic photocatalyst, in general, noble metal nanopartieles are deposited on the surface of semiconductor supports. Therefore, it is very important to understand the influences of different metal nanopartieles and supports on the interfaces between metals and supports, and the resulting photocatalytie activities. In this paper, based on the noble metals and supports of plasmonic photocatalyst, the latest important research progress is reviewed. The mechanistic aspects of plasmonic photocatalysis are discussed and the opinions on future studies are presented.