Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 7, Pages 3230-3238Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta08310b
Keywords
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Funding
- 973 program [2013CB632402]
- NSFC [51272199, 51320105001, 51372190, 21433007, 51472191]
- Natural Science Foundation of Hubei Province of China [2015CFA001]
- Fundamental Research Funds for the Central Universities [WUT: 2015-III-034]
- Innovative Research Funds of SKLWUT [2015-ZD-1]
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A two-dimensional layered polymeric photocatalyst, graphitic carbon nitride (g-C3N4), is becoming the rising star in the field of solar-to-fuel conversion. However, the performance of commonly prepared g-C3N4 is usually very weak because of the high recombination rate of photogenerated charge carriers and a small amount of surface active sites. Here we demonstrate simultaneous texture modification and surface functionalization of g-C3N4 via a stepwise NH3-mediated thermal exfoliation approach. The resulting g-C3N4 photocatalyst possesses a hierarchical structure obtained by the assembly of amine-functionalized ultrathin nanosheets and thus exhibits remarkably enhanced light harvesting, a high redox ability of charge carriers, increased CO2 adsorption and a larger amount of surface active sites, as well as improved charge carrier transfer and separation. Therefore the aforementioned hierarchical g-C3N4 consisting of amine-functionalized ultra-thin nanosheets shows much better performance for photocatalytic CO2 reduction than unmodified conventional g-C3N4 photocatalysts.
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