期刊
NANO LETTERS
卷 20, 期 9, 页码 6263-6271出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00983
关键词
quantum dots; doping; electron transfer; photocatalysts; hydrogen evolution
类别
资金
- National Research Foundation of Korea (NRF) [NRF-2019R1F1A1057554, NRF-2020R1C1C1008514]
- Priority Research Centers Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [NRF-2019R1A6A1A11053838]
Photoexcited electron extraction from semiconductors can be useful for converting solar energy into useful forms of energy. Although InP quantum dots (QDs) are considered alternative materials for solar energy conversion, the inherent instability of bare InP QDs demands the use of passivation layers such as ZnS for practical applications, which impedes carrier extraction from the QDs. Here, we demonstrate that Cu-doped InP/ZnS (InP/Cu:ZnS) QDs improve the electron transfer ability due to hole capture by Cu dopants. Steady-state and time-resolved photoluminescence studies confirmed that electrons were effectively transferred from the InP/Cu:ZnS QDs to a benzoquinone acceptor by retarding the electronhole recombination within the QD. We evaluated the photocatalytic H-2 evolution performance of InP/Cu:ZnS QDs under visible light, which showed outstanding photocatalytic H-2 evolution activity and stability under visible light illumination. The photocatalytic activity was preserved even in the absence of a cocatalyst.
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