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Conjugated polyene-functionalized graphitic carbon nitride with enhanced photocatalytic water-splitting efficiency

Title
Conjugated polyene-functionalized graphitic carbon nitride with enhanced photocatalytic water-splitting efficiency
Authors
Li, HaipingLee, Ha YoungPark, Gi SangLee, Byong JunePark, Jong DeokShin, Cheol HwanHou, WanguoYu, Jong Sung
DGIST Authors
Yu, Jong Sung
Issue Date
2018-04
Citation
Carbon, 129, 637-645
Type
Article
Article Type
Article
Keywords
CalcinationCarbon nitrideComplex networksCost effectivenessElectronsHydrogen bondsNitridesOrganic compoundsSemiconductor quantum wellsTemperatureGraphitic carbon nitridesPhotocatalytic hydrogen productionPhotocatalytic water splittingPhotogenerated electronsPhotoinduced charge carriersPhotoluminescence intensitiesPhysico-chemical stabilityVisible-light irradiationHydrogen production
ISSN
0008-6223
Abstract
Photoactivity of graphitic carbon nitride (g-C3N4) is seriously restricted by high recombination rate of photoinduced charge carriers. Herein, a g-C3N4/conjugated polyene (CP) complex is synthesized for the first time via a simple low-temperature calcination process. Lower photoluminescence intensity, longer fluorescence lifetimes, and higher photocurrent density of this complex than those of pure g-C3N4 indicate that CP works effectively as electron acceptors and quickly shuttles electrons through its high conductive network to decrease the recombination rate of photogenerated electrons and holes of g-C3N4 and improve the photocatalytic hydrogen production rate from 810 to 1270 μmol/g/h under visible light irradiation. The complex prepared by calcination at 340 °C exhibits better photoactivity than those at 240 and 400 °C. Hydrogen bonds between g-C3N4 and CP not only help to transfer electrons, but also fix CP molecules firmly on the surfaces of g-C3N4. This complex shows an excellent physicochemical stability in the photocatalytic process as well. This work provides not only a novel cost-effective way towards the preparation of new efficient g–C3N4–based complexes with better photoactivity, but also a new modification route to other photocatalysts for enhanced photocatalytic hydrogen production. © 2017 Elsevier Ltd
URI
http://hdl.handle.net/20.500.11750/5589
DOI
10.1016/j.carbon.2017.12.048
Publisher
Elsevier Ltd
Related Researcher
  • Author Yu, Jong Sung Light, Salts and Water Research Group
  • Research Interests Materials chemistry; nanomaterials; electrochemistry; carbon and porous materials; fuel cell; battery; supercapacitor; sensor and photochemical catalyst
Files:
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Collection:
Department of Energy Science and EngineeringLight, Salts and Water Research Group1. Journal Articles


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