Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 232, Issue -, Pages 86-92Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2018.03.045
Keywords
Carbon dots; CO2 reduction; Photocatalysis; Nitrogen doping; Methane
Funding
- National Natural Science Foundation of China [91545116, U1510108]
- Pioneer Hundred Talents Program of CAS, Start-Up Grant of Institute of Coal Chemistry [2016SCXQT01]
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The photocatalytic performance of carbon dots is strongly related to surface modifications and graphitization. Herein, we show that carbon dots without metal loaded can serve as an efficient photocatalyst for reducing CO2. The conjugate carbon great a could stabilize the photogenerated electrons, which turned out to improve the separation of the photogenerated electron-hole pairs and can kinetically promote interfacial reaction. Besides, the strong chemisorption of the nitrogen-containing groups on the carbon dots to the CO would help to further conversion of the intermediate in the demonstrated CO2 photo-reduction systems. As a result of these merits, the highly graphitized carbon dots prepared from graphene oxide with plenty of nitrogen-containing groups exhibit 74.8% electronic selectivity of methane. This strategy provides an important requirement for designing of CO2 photocatalysts.
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