Peering into water splitting mechanism of g-C3N4-carbon dots metal-free photocatalyst

Qu, Dan; Liu, Juan; Miao, Xiang; Han, Mumei; Zhang, Haochen; Cui, Zhe; Sun, Shaorui; Kang, Zhenhui; Fan, Hongyou; Sun, Zaicheng

doi:10.1016/j.apcatb.2018.01.030

Cited by 139 publications

(70 citation statements)

References 35 publications

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“…The 0D/2D heterojunctions of CDs/g-C 3 N 4 were synthesized by homogeneous thermal pyrolysis of urea and citric acid as the precursors of g-C 3 N 4 and CDs, respectively [59]. A similar one-step homogeneous thermal pyrolysis process that was induced by melting a mixture of citric acid and urea in water was used to synthesize g-C 3 N 4 -CD photocatalysis for water splitting [60]. Graphitic CDs are commonly produced from citric acid [13,61], while urea typically acts as a crosslinking agent for the polymerization of the g-C 3 N 4 network [62,63].…”

Section: Modification Of Cds For Photocatalysismentioning

confidence: 99%

Recent Developments in Synthesis and Photocatalytic Applications of Carbon Dots

et al. 2020

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The tunable photoluminescent and photocatalytic properties of carbon dots (CDs) via chemical surface modification have drawn increased attention to this emerging class of carbon nanomaterials. Herein, we summarize the advances in CD synthesis and modification, with a focus on surface functionalization, element doping, passivation, and nanocomposite formation with metal oxides, transition metal chalcogenides, or graphitic carbon nitrides. The effects of CD size and functionalization on photocatalytic properties are discussed, along with the photocatalytic applications of CDs in energy conversion, water splitting, hydrogen evolution, water treatment, and chemical degradation. In particular, the enzyme-mimetic and photodynamic applications of CDs for bio-related uses are thoroughly reviewed.

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Section: Modification Of Cds For Photocatalysismentioning

confidence: 99%

Recent Developments in Synthesis and Photocatalytic Applications of Carbon Dots

et al. 2020

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“…Theoretical and experimental studies revealed that g‐C 3 N 4 and CQDs could form a type II heterojunction. The CQDs as a photosensitizer in the CQDs/g‐C 3 N 4 composite extend the visible light response range and improve the separation of photogenerated electron and hole pairs …”

Section: Introductionmentioning

confidence: 99%

Chemical Interaction in Nitrogen‐Doped Graphene Quantum Dots/Graphitic Carbon Nitride Heterostructures with Enhanced Photocatalytic H₂ Evolution

Mou

Lü

et al. 2019

Energy Tech

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Strong electronic coupling between graphene quantum dots (GQDs) and graphitic carbon nitride (g‐C3N4) enables multiple charge transfer pathways, offers a new approach for light harvesting, and opens novel applications for carbon‐based materials. Herein, a nitrogen‐doped graphene quantum dots (NGQDs)/g‐C3N4 composite is designed by stitching NGQDs with g‐C3N4 through a thermal condensation approach, which conjugate via NGQDs‐lone pair electrons in a ternary N‐g‐C3N4 nanosheet (π–p–π) network. It is found that the H2 evolution rate under visible light (λ ≥ 420 nm) irradiation with NGQDs/g‐C3N4 is nearly 7.7, 7.2, and 2.5 times higher than that of pristine g‐C3N4, the mixture of NGQD and g‐C3N4, and a non‐nitrogen‐doped GQDs/g‐C3N4 composite, respectively. Due to better light harvesting in the NGQDs/g‐C3N4 composite, higher photocatalytic activities are also observed compared to others when they are illuminated by 520 and 550 nm light. It is demonstrated that the electronic coupling between NGQDs and g‐C3N4 generates new bands, driving the charge transfer along the π–p–π network and extending the visible light response range.

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“…Hence, the development of efficient techniques allowing the photodegradation of dyes to non-toxic components has become of great importance. Numerous photocatalysts have been taken into account, including oxides [5][6][7], sulfides [8][9][10] and nitrides [11]. Nevertheless, the efficient utilization of visible light remains a serious challenge.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of anisotropic Cu2−xS-based nanostructures by thermal oxidation

Kusior

Jeleń

Mazurków

et al. 2019

J Therm Anal Calorim

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Flower-like copper sulfides nanostructures were synthesized via the solvothermal route. The structural, optical and electrochemical properties of the synthesized materials were characterized by means of X-ray diffraction (XRD), scanning electron microscopy, ultraviolet-visible spectrometry and Fourier transform infrared spectroscopy (FTIR). Thermal behavior of the obtained flower-like materials was analyzed by TG, XRD and FTIR in situ measurements, over the temperature range of 25-800°C. It was found that both shape and phase composition remain stable until the temperature reaches 200°C. Phase transformation mechanism was discussed. During annealing, mixture of CuS and Cu 1.8 S is converted to copper sulfide hydroxides (200-500°C) and further to CuO (700°C and higher). Nevertheless, hierarchically porous structure is stable only to 200°C. Applying higher temperatures affects the solubility of the material and inflicts structural damage, resulting in the formation of dense oval particles with size of 20 to 200 nm.

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Peering into water splitting mechanism of g-C3N4-carbon dots metal-free photocatalyst

Cited by 139 publications

References 35 publications

Recent Developments in Synthesis and Photocatalytic Applications of Carbon Dots

Recent Developments in Synthesis and Photocatalytic Applications of Carbon Dots

Chemical Interaction in Nitrogen‐Doped Graphene Quantum Dots/Graphitic Carbon Nitride Heterostructures with Enhanced Photocatalytic H₂ Evolution

Synthesis of anisotropic Cu2−xS-based nanostructures by thermal oxidation

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Peering into water splitting mechanism of g-C3N4-carbon dots metal-free photocatalyst

Cited by 139 publications

References 35 publications

Recent Developments in Synthesis and Photocatalytic Applications of Carbon Dots

Recent Developments in Synthesis and Photocatalytic Applications of Carbon Dots

Chemical Interaction in Nitrogen‐Doped Graphene Quantum Dots/Graphitic Carbon Nitride Heterostructures with Enhanced Photocatalytic H2 Evolution

Synthesis of anisotropic Cu2−xS-based nanostructures by thermal oxidation

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Chemical Interaction in Nitrogen‐Doped Graphene Quantum Dots/Graphitic Carbon Nitride Heterostructures with Enhanced Photocatalytic H₂ Evolution