期刊
SMALL
卷 16, 期 18, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202000426
关键词
H-2 evolution; photocatalytic CO2 reduction; plasmonic heterostructures; visible light
类别
资金
- Fundamental Research Funds for the Central Universities Funding Source: Medline
- National Natural Science Foundation of China [21643003, 51702016, 51501010, 21703219, 21801015, 51631001, 51872030] Funding Source: Medline
- Beijing Institute of Technology Research Fund Program for Young Scholars and Joint R&D Plan of Hong Kong [Z191100001619002] Funding Source: Medline
- Beijing Zhongkebaice Technology Service Co., Ltd Funding Source: Medline
Here, the photocatalytic CO2 reduction reaction (CO2RR) with the selectivity of carbon products up to 100% is realized by completely suppressing the H-2 evolution reaction under visible light (lambda > 420 nm) irradiation. To target this, plasmonic Au/CdSe dumbbell nanorods enhance light harvesting and produce a plasmon-enhanced charge-rich environment; peripheral Cu2O provides rich active sites for CO2 reduction and suppresses the hydrogen generation to improve the selectivity of carbon products. The middle CdSe serves as a bridge to transfer the photocharges. Based on synthesizing these Au/CdSe-Cu2O hierarchical nanostructures (HNSs), efficient photoinduced electron/hole (e(-)/h(+)) separation and 100% of CO selectivity can be realized. Also, the 2e(-)/2H(+) products of CO can be further enhanced and hydrogenated to effectively complete 8e(-)/8H(+) reduction of CO2 to methane (CH4), where a sufficient CO concentration and the proton provided by H2O reduction are indispensable. Under the optimum condition, the Au/CdSe-Cu2O HNSs display high photocatalytic activity and stability, where the stable gas generation rates are 254 and 123 mu mol g(-1) h(-1) for CO and CH4 over a 60 h period.
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