A comparison study of alkali metal-doped g-C3N4 for visible-light photocatalytic hydrogen evolution

Jiang, Jing; Cao, Shaowen; Hu, Chenglong; Chen, Chunhua

doi:10.1016/s1872-2067(17)62936-x

Cited by 256 publications

(73 citation statements)

References 64 publications

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“…The FTIR spectra of the as-synthesized CTFs were recorded with a Nicolet 5700 instrument. The 1 H and 13 C NMR spectra were recorded on a Bruker AVANCE III NMR. High performance liquid phase chromatography (HPLC) was performed on an Agilent 1260 Infinity II.…”

Section: Characterizationmentioning

confidence: 99%

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Encapsulation of Co single sites in covalent triazine frameworks for photocatalytic production of syngas

Chen

Huang

et al. 2021

Chinese Journal of Catalysis

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The photocatalytic production of syngas using a noble-metal-free catalytic system is a promising approach for renewable energy and environmental sustainability. In this study, we demonstrate an efficient catalytic system formed by integrating Co single sites, which act as the active sites, in covalent triazine frameworks (CTFs), which act as the photoabsorber, for the photocatalytic production of syngas from CO2 in aqueous solution. The enhanced light absorption of the CTFs, which contain intramolecular heterojunctions, in conjunction with 0.8 mmol L-1 of the Co complex enables excellent syngas production with a yield of 3303 μmol g-1 (CO:H2 = 1.4:1) in 10 h, which is about three times greater than that achieved using CTF without a heterojunction. In the photocatalytic reaction, the coordinated single Co centers accept the photogenerated electrons from the CTF, and serve as active sites for CO2 conversion through an adsorption-activation-reaction mechanism. Theoretical calculations further reveal that the intramolecular heterojunctions highly promote photogenerated charge separation, thus boosting photocatalytic syngas production. This work reveals the promising potential of CTFs for single-metal-site-based photocatalysis.

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Section: Characterizationmentioning

confidence: 99%

“…Molecular-metal-complex-based photocatalytic systems have shown promising catalytic performance in the photoreduction of CO2 [13]. The coordinated metal centers serve as single active sites in the catalytic reaction [14,15].…”

Section: Introductionmentioning

confidence: 99%

Encapsulation of Co single sites in covalent triazine frameworks for photocatalytic production of syngas

Chen

Huang

et al. 2021

Chinese Journal of Catalysis

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“…Element doping is usually used to narrowing the band gap of semiconductor photocatalyst, for increasing visible light absorption efficiency [75][76][77]. Boron doped nanodiamond (BDND) with a relative narrow band gap (2.43 eV) coupled with g-C 3 N 4 to form the BDND@g-C 3 N 4 composite [20].…”

Section: H 2 Evolutionmentioning

confidence: 99%

Emerging applications of nanodiamonds in photocatalysis

Cao

Hao

et al. 2021

Functional Diamond

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as a fascinating nanocarbon photocatalytic material, nanodiamonds (NDs) have attracted more and more attention recently due to their high chemical stability, high carrier mobility, narrowing band gap, easy surface modification, and mass production. this review summarizes the latest progress related to elaborated construction of NDs and NDs-based nanocomposite, including microstructure regulation of pristine NDs, elemental doping and formation a heterojunction by coupled with another semiconductor. the construction and properties of each category of NDs-based material are reviewed on their structure, preparation methods, texture control, and photocatalytic performance. Photocatalytic applications of NDs-based nanomaterials for hydrogen evolution from water splitting, organic pollution degradation, cO 2 reduction, N 2 reduction, graphene oxide reduction, and the latest advances in photocatalytic reaction mechanism have been also systematically reviewed. Finally, the challenges and prospects of the photocatalytic application of NDs are also briefly analyzed.

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“…[13][14][15][16][17] The photocatalytic activity of bare g-C 3 N 4 is unsatisfactory due to its smaller surface area and rapid recombination of photogenerated carriers under visible light irradiation. [18][19][20] In order to achieve better photocatalytic performance, a series of methods have been applied to modify g-C 3 N 4 , such as doping metal ions, 21,22 nonmetallic elements, 23,24 constructing heterojunctions 25,26 and introducing vacancies. 27,28 Among these methods, the method of introducing vacancies inspired by previous work [29][30][31][32][33] has proved to be one of the most e®ective methods through theoretical calculation and experiment, because it could greatly increase the speci¯c surface area and provide more active sites for the reaction, which are favorable to enormously enhance the photocatalytic performance.…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach to Synthesize Nitrogen-Deficient g-C₃N₄for the Enhanced Photocatalytic Contaminant Degradation and Electrocatalytic Hydrogen Evolution

Zhang

Zhou

et al. 2020

NANO

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Graphitic carbon nitride with nitrogen vacancies was successfully synthesized by the three-step method for the calcination of melamine, following urea-assisted hydrothermal and jacjoin calcination approach. The structural, surface, optical and electric properties were characterized by XRD, FT-IR, SEM, TEM, UV–Vis DRS, PL, N2 physical adsorption/desorption and electrochemical methods, which proved that this strategy of modifying g-C3N4 by nitrogen vacancies not only increased the specific surface area, exposed more active sites, but also inhibited the recombination of photogenerated carriers on the surface of photocatalysts, resulting in the enhancement of photocatalytic and electrocatalytic performances. The photocatalytic activities were measured under visible light irradiation ([Formula: see text][Formula: see text]nm), and their degradation efficiencies could be achieved for 99.8%, 55%, 100% and 99.7% corresponding to that of rhodamine B, acid orange II, methyl orange and methylene blue, respectively. The trapping experiments demonstrated that [Formula: see text] played an important role in the degradation process. In addition, being an active electrocatalyst, nitrogen-deficient g-C3N4 showed a lower Tafel slope, smaller overpotential and the more effective electrochemical surface area compared with that of bare g-C3N4 in neutral media. This work underlines the importance of defect engineering to promote catalytic performance, which can provide a simple and efficient way for modifying g-C3N4 and other N-based catalysts.

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A comparison study of alkali metal-doped g-C3N4 for visible-light photocatalytic hydrogen evolution

Cited by 256 publications

References 64 publications

Encapsulation of Co single sites in covalent triazine frameworks for photocatalytic production of syngas

Encapsulation of Co single sites in covalent triazine frameworks for photocatalytic production of syngas

Emerging applications of nanodiamonds in photocatalysis

A Novel Approach to Synthesize Nitrogen-Deficient g-C₃N₄for the Enhanced Photocatalytic Contaminant Degradation and Electrocatalytic Hydrogen Evolution

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A comparison study of alkali metal-doped g-C3N4 for visible-light photocatalytic hydrogen evolution

Cited by 256 publications

References 64 publications

Encapsulation of Co single sites in covalent triazine frameworks for photocatalytic production of syngas

Encapsulation of Co single sites in covalent triazine frameworks for photocatalytic production of syngas

Emerging applications of nanodiamonds in photocatalysis

A Novel Approach to Synthesize Nitrogen-Deficient g-C3N4for the Enhanced Photocatalytic Contaminant Degradation and Electrocatalytic Hydrogen Evolution

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A Novel Approach to Synthesize Nitrogen-Deficient g-C₃N₄for the Enhanced Photocatalytic Contaminant Degradation and Electrocatalytic Hydrogen Evolution