In-situ growth of CdS quantum dots on g-C3N4 nanosheets for highly efficient photocatalytic hydrogen generation under visible light irradiation

Cao, Shaowen; Yuan, Yupeng; Fang, Jun; Shahjamali, Mohammad Mehdi; Boey, Freddy Yin Chiang; Barber, James; Loo, Say Chye Joachim; Xue, Can

doi:10.1016/j.ijhydene.2012.10.116

Cited by 341 publications

(161 citation statements)

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“…XPS spectra of sample M1:1: (A) survey spectrum, high-resolution XPS spectrum of C1s, N1s, and O1s. surface [35]. The N 1s spectrum shows three deconvoluted peaks at binding energies of 398.8, 400.6, and 404.4 eV.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced visible-light-driven photocatalytic performance of porous graphitic carbon nitride

Chang

Luo

et al. 2015

Applied Surface Science

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a b s t r a c tIn this study, a series of porous graphitic carbon nitride (g-C 3 N 4 ) materials were fabricated through a direct pyrolysis of protonated melamine by nitric acid solution. These as-prepared porous samples were characterized by a collection of analytical techniques. It was found that a proper concentration of nitric acid solution involved facilitated to generate samples in tube-like morphology with numerous pores, identified with X-ray diffraction patterns, FT-IR spectra, SEM, TEM, and BET measurements. These g-C 3 N 4 samples were subjected to photocatalytic degradation of dye Rhodamine B (RhB) in aqueous under visible-light irradiation. Under identical conditions, those porous g-C 3 N 4 samples showed significantly improved catalytic performance in comparison with the sample prepared without the introduction of nitric acid. In particularly, the best candidate, sample M1:1, showed an apparent reaction rate nearly 6.2 times that of the unmodified counterpart. The enhancement of photocatalytic performance could be attributed to the favorable porous structure with the enlarged specific surface area and the suitable electronic structure as well. In addition, ESR measurements were conducted for the sake of proposing a photocatalytic degradation mechanism.

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Section: Resultsmentioning

confidence: 99%

“…The N 1s spectrum shows three deconvoluted peaks at binding energies of 398.8, 400.6, and 404.4 eV. The first two signals are assigned to the nitrogen atoms in N C N and N (C) 3 moieties [24,35], and the last weak peak is attributed to charging effects [34,36]. The O1s peak at 532.1 is relevant to the adsorbed H 2 O on surface [6].…”

Section: Resultsmentioning

confidence: 99%

Enhanced visible-light-driven photocatalytic performance of porous graphitic carbon nitride

Chang

Luo

et al. 2015

Applied Surface Science

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“…[1][2][3][6][7][8] One strategy to promote charge separation is to use CdS of smaller sizes. [3,[7][8][9] If CdS is prepared as quantum dots (QDs), the charge separation can be improved greatly as a result of the quantum-confinement effect. [7][8][9] Another strategy is to incorporate CdS onto certain support materials, such as metal oxides, graphene, and carbon nitride, to form heterostructures that have favorable interfaces for charge separation.…”

Section: Introductionmentioning

confidence: 99%

Cadmium Sulfide Quantum Dots Supported on Gallium and Indium Oxide for Visible‐Light‐Driven Hydrogen Evolution from Water

et al. 2014

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In this work, CdS quantum dots (QDs) supported on Ga2O3 and In2O3 are applied for visible-light-driven H2 evolution from aqueous solutions that contain lactic acid. With Pt as the cocatalyst, the H2 evolution rates on CdS/Pt/Ga2O3 and CdS/Pt/In2O3 are as high as 995.8 and 1032.2 μmol h(-1), respectively, under visible light (λ>420 nm) with apparent quantum efficiencies of 43.6 and 45.3% obtained at 460 nm, respectively. These are much higher than those on Pt/CdS (108.09 μmol h(-1)), Pt/Ga2O3 (0.12 μmol h(-1)), and Pt/In2O3 (0.05 μmol h(-1)). The photocatalysts have been characterized thoroughly and their band structures and photocurrent responses have been measured. The band alignment between the CdS QDs and In2O3 can lead to interfacial charge separation, which cannot occur between the CdS QDs and Ga2O3. Among the various possible factors that contribute to the high H2 evolution rates on CdS/Pt/oxide, the surface properties of the metal oxides play important roles, which include (i) the anchoring of CdS QDs and Pt nanoparticles for favorable interactions and (ii) the efficient trapping of photogenerated electrons from the CdS QDs because of surface defects (such as oxygen defects) based on photoluminescence and photocurrent studies.

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“…However, the catalytic efficiency is quite low due to the high recombination rate of excited charge carriers. As a result, advancement of g-C 3 N 4 structure is extremely desired to avoid this shortcoming and mainly associates with the construction of mesoporous structure [23,24], doping with metal or nonmetal elements [25][26][27][28], composting with other semiconductors [29][30][31][32][33], and exfoliation of bulk form into nanosheets [34][35][36][37]. In particular, the exfoliation of bulk g-C 3 N 4 to nanosheets is able to reduce the edge thickness and create new exposed surface, easily leading to the enlarged specific surface area, enhanced charge carriers motilities through reduced migration distances, and variable conduction and valence band positions, which is favorable to the enhancement of photocatalytic performance [34,36].…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic performance of g-C3N4 nanosheets–BiOBr hybrids

Chang¹,

Li²,

Chen³

et al. 2014

Superlattices and Microstructures

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a b s t r a c tExfoliated g-C 3 N 4 (CNs)-BiOBr hybrids with heterojunction structure was fabricated through a chemical deposition-precipitation route. The characterization showed the uniform existence of CNs and BiOBr in hybrids. The fabricated CNs-BiOBr was of enlarged specific surface area, unique optical property, and well-matched energy-band structures. The photocatalytic performance on dye Rhodamine B (RhB) and 2,4-diclorophenol (2,4-DCP) were dramatically improved. Under identical conditions, sample 0.5CNs-BiOBr and CNs-BiOBr were identified as the best candidate, respectively, for catalytic degradation of RhB and 2,4-DCP. The former could show a reaction rate over RhB about 2.7 and 6.8 times as high as BiOBr and CNs alone, and the later exhibited a reaction rate over 2,4-DCP nearly 7.5 and 2.5 times as high as individual BiOBr and CNs. Finally, a possible catalytic mechanism was also proposed through active species trapping experiments.

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In-situ growth of CdS quantum dots on g-C3N4 nanosheets for highly efficient photocatalytic hydrogen generation under visible light irradiation

Cited by 341 publications

References 50 publications

Enhanced visible-light-driven photocatalytic performance of porous graphitic carbon nitride

Enhanced visible-light-driven photocatalytic performance of porous graphitic carbon nitride

Cadmium Sulfide Quantum Dots Supported on Gallium and Indium Oxide for Visible‐Light‐Driven Hydrogen Evolution from Water

Enhanced photocatalytic performance of g-C3N4 nanosheets–BiOBr hybrids

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