Construction of rGO-coupled C3N4/C3N5 2D/2D Z-scheme heterojunction to accelerate charge separation for efficient visible light H2 evolution

Liu, Dong; Yao, Jia; Chen, Shentao; Zhang, Jing; Li, Renjie; Peng, Tianyou

doi:10.1016/j.apcatb.2022.121822

Cited by 88 publications

(28 citation statements)

References 52 publications

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“…Furthermore, it also possesses a narrow bandgap (around 2.7 eV) to excite charge carriers efficiently and obtain the visible-light response and suitable conduction band (CB) to produce H 2 , which makes it receive much concern in the application of PCHG. , However, the limited light harvesting and inherent fast recombination of photogenerated carriers for pure g-C 3 N 4 hinder its H 2 generation rate . Although many strategies such as defect control, , nano-structure design, , heterojunction construction, − and cocatalyst loading , are applied, it is necessary to further improve the PCHG efficiency via expanding the light response range and enhancing the separation and transfer rates of carriers.…”

Section: Introductionmentioning

confidence: 99%

Near-Infrared-Induced Photothermal Enhanced Photocatalytic H₂ Production for 3D/2D Heterojunctions of Snowflake-like CuS/g-C₃N₄ Nanosheets

et al. 2022

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The conversion of solar power to hydrogen (H 2 ) energy efficiently encounters some obstacles due to the lack of superior catalysts and efficient catalytic approaches. Herein, three-dimensional/ two-dimensional (3D/2D) CuS/g-C 3 N 4 photothermal catalysts were obtained via an easy, one-step hydrothermal method after pyrolysis. The favorable heterojunction interface for H 2 production was constructed by snowflake-like CuS embedded in the graphite carbon nitride (g-C 3 N 4 ) nanosheets, leading to the acceleration of charge transfer and separation, decrease of charge transfer distance, and perfect realization of photothermal effects (PTEs) induced by nearinfrared (NIR) light. The 3D/2D CuS/g-C 3 N 4 catalyst presents a topmost H 2 -production rate (1422 μmol h −1 g −1 ) under dual wavelength (420 + 850 nm) and a moderate H 2 -production rate under 420 nm, which are 12-fold and 9-fold higher than pure g-C 3 N 4 , respectively, owing to a strong action from PTEs induced by NIR. The feasible NIR-enhanced photothermal catalysis is expected to apply in multifarious heat-assisted photocatalysis processes by designing multifunctional composites with super PTE and photocatalytic capacity.

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Section: Introductionmentioning

confidence: 99%

Near-Infrared-Induced Photothermal Enhanced Photocatalytic H₂ Production for 3D/2D Heterojunctions of Snowflake-like CuS/g-C₃N₄ Nanosheets

et al. 2022

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“…The special 2D nanosheet morphology and π-conjugated frameworks not only achieves the maximum intimacy to shorten the charge diffusion distance, but also facilitates the interface interaction for efficient H 2 evolution performance. [26] Guided by these studies, and also considering that the synergistic functionalities and advantages of the coreshell structures, such as large contact area, more charge transport channels, and good protection for the core material from direct contact with external environment, we proposed to build a simple binary Z-scheme photocatalyst g-C 3 N 5 /CdS for photocatalytic hydrogen production.…”

Section: Introductionmentioning

confidence: 99%

Z‐Scheme Strategy in Polymeric Graphitic C₃N₅/CdS Core–Shell Heterojunction Drives Long‐Lived Carriers Separation for Robust Visible‐Light Hydrogen Production

Wang

Cao

et al. 2022

Adv Materials Inter

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The intrinsic charge carriers’ recombination and excited states decay greatly suppress the active species survival and photo(electro)catalytic performance. Inspired by Z‐scheme strategy, the polymeric nitrogen‐rich carbon nitride/cadmium sulfide (g‐C3N5/CdS) core–shell heterojunction is constructed to optimize photocatalytic performance. The optimal hydrogen production rate of g‐C3N5/CdS heterojunction catalyst under visible light without adding extra cocatalyst is up to 7860 µmol h−1 g−1, which is 3 and 71 times higher than that of pure CdS and g‐C3N5 photocatalysts, respectively. The femtosecond transient absorption spectroscopy is employed to observe the kinetic decay of carriers in the heterojunction, revealing the ultrafast charge trapping process (τ1 = 52.3 ps) and long‐lived excited states (τ3 = 1109.2 ps) in g‐C3N5/CdS photocatalyst. Meanwhile, density functional theory calculation results comprehensively suggest the promoted charge separation in heterojunction. Cost‐effective Z‐scheme g‐C3N5/CdS photocatalyst in this work shows a great potential for sustainable and high‐efficiency solar‐to‐H2 conversion.

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“…24 Zhang et al 22 removed nitric oxide by TiO 2coupled C 3 N 5 in visible light. Liu et al 25 constructed Z-scheme heterojunction by reduced graphene oxide-coupled C 3 N 4 /C 3 N 5 that can effectively improve photocatalytic activity to promote H 2 evolution. Li et al 26 constructed oxygen vacancy Bi 2 MoO 6 / C 3 N 5 composites to enhance photocatalytic degradation of tetracycline (TC) and reduction of Cr (VI).…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al removed nitric oxide by TiO 2 -coupled C 3 N 5 in visible light. Liu et al constructed Z -scheme heterojunction by reduced graphene oxide-coupled C 3 N 4 /C 3 N 5 that can effectively improve photocatalytic activity to promote H 2 evolution. Li et al .…”

Section: Introductionmentioning

confidence: 99%

Internal Electric-Field-Driven CoAl-LDH Coupled N-Rich Carbon Nitride of C₃N₅ for Improved Photocatalytic Performance

Sun

Jiao

et al. 2023

Ind. Eng. Chem. Res.

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Preparing photocatalysts with excellent performance to degrade organic pollutants in water is still a great challenge. Herein, we prepared CoAl-layered double hydroxide (LDH) coupled N-rich carbon nitride of C 3 N 5 materials to investigate the feasibility of preparing materials for photocatalytic treatment of organic pollutants under natural water bodies. After 120 min of light exposure, the CoAl-LDH/C 3 N 5 (CCN-100) composite showed optimal photocatalytic degradation performance, in which the degradation efficiency reached 94.02% in pure water and 91.85% in Xiangjiang water. Three possible photocatalytic degradation pathways of tetracycline were analyzed by liquid chromatography with tandem mass spectrometry. The toxicity of the intermediates was assessed by toxicity assessment software. The results showed that the toxicity of the intermediates was greatly reduced. We analyzed the formation of the internal electric field and the direction of charge migration in the CoAl-LDH/C 3 N 5 heterojunction by the difference in the work function and the energy band structure of CoAl-LDH and C 3 N 5 . According to various characterization analysis and experimental results, the internal electric field formed between CoAl-LDH and C 3 N 5 accelerates the charge transfer and the rapid separation of photogenerated electron holes thus improving the photocatalytic degradation performance. This study provides new insights into the effective removal of organic pollutants from water through the formation of an internal electric field in CoAl-LDH/C 3 N 5 heterojunction.

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Construction of rGO-coupled C3N4/C3N5 2D/2D Z-scheme heterojunction to accelerate charge separation for efficient visible light H2 evolution

Cited by 88 publications

References 52 publications

Near-Infrared-Induced Photothermal Enhanced Photocatalytic H₂ Production for 3D/2D Heterojunctions of Snowflake-like CuS/g-C₃N₄ Nanosheets

Near-Infrared-Induced Photothermal Enhanced Photocatalytic H₂ Production for 3D/2D Heterojunctions of Snowflake-like CuS/g-C₃N₄ Nanosheets

Z‐Scheme Strategy in Polymeric Graphitic C₃N₅/CdS Core–Shell Heterojunction Drives Long‐Lived Carriers Separation for Robust Visible‐Light Hydrogen Production

Internal Electric-Field-Driven CoAl-LDH Coupled N-Rich Carbon Nitride of C₃N₅ for Improved Photocatalytic Performance

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Construction of rGO-coupled C3N4/C3N5 2D/2D Z-scheme heterojunction to accelerate charge separation for efficient visible light H2 evolution

Cited by 88 publications

References 52 publications

Near-Infrared-Induced Photothermal Enhanced Photocatalytic H2 Production for 3D/2D Heterojunctions of Snowflake-like CuS/g-C3N4 Nanosheets

Near-Infrared-Induced Photothermal Enhanced Photocatalytic H2 Production for 3D/2D Heterojunctions of Snowflake-like CuS/g-C3N4 Nanosheets

Z‐Scheme Strategy in Polymeric Graphitic C3N5/CdS Core–Shell Heterojunction Drives Long‐Lived Carriers Separation for Robust Visible‐Light Hydrogen Production

Internal Electric-Field-Driven CoAl-LDH Coupled N-Rich Carbon Nitride of C3N5 for Improved Photocatalytic Performance

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Near-Infrared-Induced Photothermal Enhanced Photocatalytic H₂ Production for 3D/2D Heterojunctions of Snowflake-like CuS/g-C₃N₄ Nanosheets

Near-Infrared-Induced Photothermal Enhanced Photocatalytic H₂ Production for 3D/2D Heterojunctions of Snowflake-like CuS/g-C₃N₄ Nanosheets

Z‐Scheme Strategy in Polymeric Graphitic C₃N₅/CdS Core–Shell Heterojunction Drives Long‐Lived Carriers Separation for Robust Visible‐Light Hydrogen Production

Internal Electric-Field-Driven CoAl-LDH Coupled N-Rich Carbon Nitride of C₃N₅ for Improved Photocatalytic Performance