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

Conjugated polyene-functionalized graphitic carbon nitride with enhanced photocatalytic water-splitting efficiency
Li, HaipingLee, Ha YoungPark, Gi SangLee, Byong JunePark, Jong DeokShin, Cheol HwanHou, WanguoYu, Jong Sung
DGIST Authors
Yu, Jong Sung
Issued Date
Article Type
CalcinationCarbon nitrideComplex networksCost effectivenessElectronsHydrogen bondsNitridesOrganic compoundsSemiconductor quantum wellsTemperatureGraphitic carbon nitridesPhotocatalytic hydrogen productionPhotocatalytic water splittingPhotogenerated electronsPhotoinduced charge carriersPhotoluminescence intensitiesPhysico-chemical stabilityVisible-light irradiationHydrogen production
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
Elsevier Ltd
Related Researcher
  • 유종성 Yu, Jong-Sung 에너지공학과
  • Research Interests Materials chemistry; nanomaterials; electrochemistry; carbon and porous materials; fuel cell; battery; supercapacitor; sensor and photochemical catalyst
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Department of Energy Science and Engineering Light, Salts and Water Research Group 1. Journal Articles


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