欧姆接触
金属
贵金属
纳米颗粒
材料科学
光催化
肖特基势垒
电子转移
半导体
纳米技术
化学工程
催化作用
光化学
图层(电子)
冶金
光电子学
化学
二极管
工程类
生物化学
作者
Qianxia Liu,Zhuan Wang,Hailong Chen,Hao‐Yi Wang,Hui Song,Jinhua Ye,Yuxiang Weng
出处
期刊:Chemcatchem
[Wiley]
日期:2020-04-30
卷期号:12 (15): 3838-3842
被引量:22
标识
DOI:10.1002/cctc.202000280
摘要
Abstract Loading metal cocatalyst on semiconductor nanoparticles is a general strategy to enhance photocatalytic efficiency, while the consensus of selecting metal cocatalyst matching with semiconductor is still unclear. Herein, we investigated the charge transfer and separation efficiency between ZnO and cocatalysts Ag, Au, and Pt nanoparticles respectively using ultrafast mid‐IR transient absorption spectroscopy. We found that Ohmic contact of Ag with ZnO favoring electron transfer and charge separation, while Schottky junction of Pt or Au with ZnO preventing electron transfer from ZnO to metal. Thus Ohmic contact would be better than Schottky contact. Since photocatalytic efficiency is also determined by chemical catalytic efficiency, we proposed a dual metal cocatalyst strategy for improving the overall photocatalytic efficiency, with the inner metal forming Ohmic contact for efficient charge separation and shuttling electrons and the outer‐layer metal cocatalyst for optimizing the chemical reactivity.
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