期刊
NANO LETTERS
卷 19, 期 1, 页码 426-432出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b04245
关键词
Defect; photocatalysis; solar energy conversion; charge separation; surface photovoltage
类别
资金
- National Natural Science Foundation of China [21633015, 21773228]
- CAS Interdisciplinary Innovation Team [JCTD-2018-10]
- DICP Innovation Fundation
- DICP [SZ201801]
- Strategic Priority Research Program and Equipment Development Project of the Chinese Academy of Sciences [XDB17000000, YJKYYQ20170002]
Defects can markedly impact the performance of semiconductor-based photocatalysts, where the spatial separation of photo generated charges is required for converting solar energy into fuels. However, understanding exactly how defects affect photogenerated charge separation at nanometer scale remains quite challenging. Here, using time and space-resolved surface photovoltage approaches, we demonstrate that the distribution of surface photogenerated charges and the direction of photogenerated charge separation are determined by the defects distributed within a 100 nm surface region of a photocatalytic Cu2O particle. This is enabled by the defect-induced charge separation process, arising from the trapping of electrons at the near-surface defect states and the accumulation of holes at the surface states. More importantly, the driving force for defect-induced charge separation is greater than 4.2 kV/cm and can be used to drive photocatalytic reactions. These findings highlight the importance of near-surface defect engineering in promoting photogenerated charge separation and manipulating surface photogenerated charges; further, they open up a powerful avenue for improving photocatalytic charge separation and solar energy conversion efficiency.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据