3D macropore carbon-vacancy g-C3N4 constructed using polymethylmethacrylate spheres for enhanced photocatalytic H2 evolution and CO2 reduction

Wang, Xuewen; Li, Qiuchan; Gan, Lei; Ji, Xinfei; Chen, Fayun; Xu, Peng; Zhang, Rongbin

doi:10.1016/j.jechem.2020.05.001

Cited by 120 publications

(45 citation statements)

References 61 publications

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“…However, the PL intensity was decreased in the hierarchical 3D structure of HCN, which confirms that structured g-C 3 N 4 is more efficient for separation of charge carriers. 49 In TiC-48 MXene, a much lower charge recombination rate (PL intensity) was observed, probably due to their conductive characteristics. A much lower PL intensity was obtained when HCN was coupled with TiC-48, due to formation of a 2D/3D heterojunction of the TiC-48/HCN composite.…”

Section: Resultsmentioning

confidence: 99%

Investigating the Influential Effect of Etchant Time in Constructing 2D/2D HCN/MXene Heterojunction with Controlled Growth of TiO₂ NPs for Stimulating Photocatalytic H₂ Production

Tahir

2021

Energy Fuels

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Well-designed, two-dimensional hierarchical g-C 3 N 4 (2D HCN) nanosheets anchored over two-dimensional exfoliated titanium carbide (2D TiC) multilayers embedded with in situ grown TiO 2 were fabricated for stimulating H 2 production under visible light. The Ti 3 C 2 efficiency was directly influenced by varying the etching time ranging from 24 to 96 h. Using optimized 2D TiC multilayers embedded with TiO 2 (anatase) with etchant time 48 h, the highest H 2 yield of 182.5 μmol g −1 h −1 was attained, an obviously higher production rate than using etchant times of 24, 72, and 96 h, due to improved charge carrier separation efficiency through heterojunction formation. Hierarchical g-C 3 N 4 exhibited 1.26 times more H 2 yield than using bulk g-C 3 N 4 due to efficient migration and transportation of charge carrier. The H 2 production rate of the optimized 10TiC-48/HCN 2D/2D heterojunction reached 310 μmol g −1 h −1 which is ∼1.93, 2.33, and 2.95 times higher than it was produced over TiC-48, HCN, and CN, respectively. This proficient hydrogen production was due to faster transfer of electrons from HCN to TiC-MXene due to higher conductivity and formation of heterojunction between HCN and TiO 2 with their synergistic effects. The continuous production of H 2 with recyclability evidenced 2D/2D heterojunction advantages and provides new insight on the role of the hierarchical MXene composite and, thus, would be beneficial for solar energy applications.

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Section: Resultsmentioning

confidence: 99%

Investigating the Influential Effect of Etchant Time in Constructing 2D/2D HCN/MXene Heterojunction with Controlled Growth of TiO₂ NPs for Stimulating Photocatalytic H₂ Production

Tahir

2021

Energy Fuels

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“…The introduction of the C vacancy also led to a wide visible‐light absorption band (Figure 16C) as well as enhanced electron–hole separation, which was validated by the strong Lorentzian line at g = 2.0038 relative to g‐C 3 N 4 (Figure 16D). Therefore, the combined effects of increased active sites, enhanced light absorption range and low carrier recombination resulted in a CH 3 OH production rate of 7.8 μmol g −1 h −1 that was four times higher than pristine g‐C 3 N 4 179 …”

Section: Co2 Reduction Performance Of G‐c3n4‐based Nanomaterialsmentioning

confidence: 97%

Section: Co2 Reduction Performance Of G‐c3n4‐based Nanomaterialsmentioning

confidence: 99%

Solar‐powered chemistry: Engineering low‐dimensional carbon nitride‐based nanostructures for selective CO₂ conversion to C₁C₂ products

Foo

Ong

2022

InfoMat

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CO2 capture and conversion has been prospected as an auspicious technology to simultaneously tackle the rise in global CO2 emission and produce value‐added fuels with the goal of accomplishing carbon neutrality. A sustainable route to achieve this is via the utilization of solar energy, thereby harnessing the abundant and nonexhaustive resource to shift our reliance away from rapidly depleting fossil fuels. Graphitic carbon nitride (g‐C3N4) and its allotrope have earned its rank as a fascinating metal‐free photocatalyst due to its superior stability, high surface‐area‐to‐volume ratio, and tunable surface engineering. By leveraging these properties, robust carbon nitride‐based nanostructures are engineered for photocatalytic CO2 conversion to energy‐rich C1C2 product, which is indispensable in the chemical industry. Thus, this review presents the latest panorama of experimental and computational research on tuning the local electronic, surface chemical coordination environment, charge dynamics and optical properties of low‐dimensional carbon nitride and its allotropes toward highly selective and efficient CO2 photoconversion. To name a few, structural engineering, point‐defect engineering, heterojunction construction, and cocatalyst loading. To advance this frontier, critical insights are elucidated to establish the structure‐performance relationship and unravel primary factors dictating the selectivity of C1C2 molecules from CO2 reduction. External‐field assisted photocatalysis such as with electric (photoelectro‐) and heat (photothermal) is discussed to uncover the synergistic contributions that drive the development in photochemistry. Last, future challenges and prospects are outlined for the potential application of solar‐driven CO2 conversion, along with the scale‐up strategy from the economic viewpoint toward the rational development of high‐efficiency carbon nitride catalysts.

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“…In recent years, the metal-free polymer graphitized carbonitride (g-C 3 N 4 ) has seen a wide explosion of interest as a semiconductor catalyst because of its visible light response, ease to manufacture, low cost, and environmentally friendliness. − It has excellent chemical and thermal stabilities, showing a nontoxic property and great photocatalytic stability . It has been widely studied in the fields of photocatalytic degradation of organic compounds, hydrogen production, and photoreduction of CO 2 .…”

Section: Photocatalytic Reduction Of Carbon Dioxide With Various Ligh...mentioning

confidence: 99%

Research Progress on CO₂ Photocatalytic Reduction with Full Solar Spectral Responses

et al. 2021

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Photoreduction of CO 2 can effectively alleviate the troublesome global energy crisis and environmental problems by converting CO 2 into hydrocarbons. Due to the discovery of photocatalysts that can respond to infrared light, the application of full spectrum in photocatalysis has attracted many researchers. This review comprehensively summarizes the progress in CO 2 photocatalytic reduction based on full-spectrum photocatalytic systems, and the basic theory of photoresponse, the mechanism of photocatalysis and photoreduction of CO 2 , and the representative photocatalytic materials working under ultraviolet, visible, and infrared irradiation are discussed. The strategies and related mechanisms of realizing full-spectrum photocatalysis are introduced, and the contribution of photoreactors to CO 2 photocatalytic reduction is also mentioned. Finally, the application prospects of light-driven reactions in CO 2 reduction are prospected. It is hoped that this review can offer clearer guidance for CO 2 reduction and construction of full spectrum-driven photocatalyst for efficient photocatalytic CO 2 reduction in the future.

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3D macropore carbon-vacancy g-C3N4 constructed using polymethylmethacrylate spheres for enhanced photocatalytic H2 evolution and CO2 reduction

Cited by 120 publications

References 61 publications

Investigating the Influential Effect of Etchant Time in Constructing 2D/2D HCN/MXene Heterojunction with Controlled Growth of TiO₂ NPs for Stimulating Photocatalytic H₂ Production

Investigating the Influential Effect of Etchant Time in Constructing 2D/2D HCN/MXene Heterojunction with Controlled Growth of TiO₂ NPs for Stimulating Photocatalytic H₂ Production

Solar‐powered chemistry: Engineering low‐dimensional carbon nitride‐based nanostructures for selective CO₂ conversion to C₁C₂ products

Research Progress on CO₂ Photocatalytic Reduction with Full Solar Spectral Responses

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3D macropore carbon-vacancy g-C3N4 constructed using polymethylmethacrylate spheres for enhanced photocatalytic H2 evolution and CO2 reduction

Cited by 120 publications

References 61 publications

Investigating the Influential Effect of Etchant Time in Constructing 2D/2D HCN/MXene Heterojunction with Controlled Growth of TiO2 NPs for Stimulating Photocatalytic H2 Production

Investigating the Influential Effect of Etchant Time in Constructing 2D/2D HCN/MXene Heterojunction with Controlled Growth of TiO2 NPs for Stimulating Photocatalytic H2 Production

Solar‐powered chemistry: Engineering low‐dimensional carbon nitride‐based nanostructures for selective CO2 conversion to C1C2 products

Research Progress on CO2 Photocatalytic Reduction with Full Solar Spectral Responses

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Investigating the Influential Effect of Etchant Time in Constructing 2D/2D HCN/MXene Heterojunction with Controlled Growth of TiO₂ NPs for Stimulating Photocatalytic H₂ Production

Investigating the Influential Effect of Etchant Time in Constructing 2D/2D HCN/MXene Heterojunction with Controlled Growth of TiO₂ NPs for Stimulating Photocatalytic H₂ Production

Solar‐powered chemistry: Engineering low‐dimensional carbon nitride‐based nanostructures for selective CO₂ conversion to C₁C₂ products

Research Progress on CO₂ Photocatalytic Reduction with Full Solar Spectral Responses