Defects modified in the exfoliation of g-C3N4 nanosheets via a self-assembly process for improved hydrogen evolution performance

Wang, Jian; Yang, Zhijie; Yao, Wenqing; Gao, Xingxing; Tao, D.

doi:10.1016/j.apcatb.2018.07.017

Cited by 87 publications

(45 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The weak peak at 13.0°which was derived from the inplane structural repeated motif of tri-s-triazine units with an interplanar distance of d ¼ 0.663 nm (Wang et al 2018c). The dominant peak, which was at 27.4°, was derived from the aromatic ring system stack whose interplanar distance was 0.324 nm (Wang et al 2018a). As for MoS 2 samples, the two diffraction peaks at 33.3°and 58.8°c orresponded well to MoS 2 (JCPDS 37-1492) (Zhang et al 2019a), which represented the (101) and (110) crystal planes, respectively.…”

Section: Structure and Morphology Analysismentioning

confidence: 84%

New g-C3N4/GO/MoS2 composites as efficient photocatalyst for photocathodic protection of 304 stainless steel

Zheng

Sun

Liu³

et al. 2021

Water Science and Technology

View full text Add to dashboard Cite

Photocathodic protection is an economical and environmental metal anticorrosion method. In this research, we successfully synthesized the g-C3N4/GO (15 wt%)/MoS2 catalytic materials by a facile hydrothermal method. The results show that as-prepared g-C3N4/GO (15 wt%)/MoS2 composites prominently enhanced the photocatalytic activities for the photocathodic protection of 304 stainless steel compared with the corresponding pristine g-C3N4 and MoS2. Notably, the AC impedance results demonstrated that the Rct value of 304 SS coupled with g-C3N4/GO (15 wt%)/MoS2 decreased to 35.66 Ω•cm2, which is 29 and 37 times lower than that of g-C3N4 and MoS2 alone. In addition, g-C3N4/GO (15 wt%)/MoS2 provided the highest current density (77.19 μA•cm2) for the 304 SS, which is 4 times of pristine g-C3N4. All results indicate that as-prepared g-C3N4/GO (15 wt%)/MoS2 photocatalysts have exhibited distinct enhancement on photocathodic protection performance. An optimum decorating amount of MoS2 onto g-C3N4 forms heterojunction of g-C3N4/MoS2, which favors the separation of electrons and holes efficiently. Meanwhile, the addition of GO further promotes the separation and transfer of photo-induced carriers.

show abstract

Section: Structure and Morphology Analysismentioning

confidence: 84%

New g-C3N4/GO/MoS2 composites as efficient photocatalyst for photocathodic protection of 304 stainless steel

Zheng

Sun

Liu³

et al. 2021

Water Science and Technology

View full text Add to dashboard Cite

show abstract

“…The H 2 evolution rate of CNNS/TiN/TiO 2− x ‐3 was comparable and even better than those of reported catalysts. [ 37–48 ] The dramatic boost of hydrogen evolution activity was attributed to the three‐phase heterojunction structure, which led to efficient charge separation.…”

Section: Resultsmentioning

confidence: 99%

TiN Bridged All‐Solid Z‐Scheme CNNS/TiN/TiO₂₋_x Heterojunction by a Facile In Situ Reduction Strategy for Enhanced Photocatalytic Hydrogen Evolution

Yuan

Jiao

et al. 2021

Adv Materials Inter

View full text Add to dashboard Cite

Proper interfacial electron mediators greatly influence the charge transfer efficiency of Z‐scheme photocatalytic system. TiN bridged all‐solid Z‐scheme CNNS/TiN/TiO2−x heterojunction composites are prepared by a facile in situ reduction strategy for highly promoted photocatalytic hydrogen evolution driven by visible light. The reduction process not only creates oxygen vacancies in TiO2 but also reduces partial TiO2 to TiN. Oxygen defected TiO2−x permits TiO2 visible light absorption capacity. Fermi level equilibrium forms internal electric fields at the interfaces to drive the charge transfer. Meanwhile, TiN electrons mediator connects the conduction band of TiO2−x and the valance band of CNNS, which is advantageous for the transfer of photoelectrons from the conduction band of TiO2−x to the valance band of CNNS. Compared with pure carbon nitride (CN), TiO2, and even composites CN/TiO2 without TiN, CNNS/TiN/TiO2−x shows a remarkably enhanced visible light catalytic hydrogen evolution performance of 1230 μmol g−1 h−1, about 95 times than that of pure CN. The dramatically boosted photocatalytic activity is attributed to the extra visible light absorption capacity of TiO2−x and convenient electron transfer between CNNS and TiO2−x through TiN electrons mediator.

show abstract

“…The C peak at 288.5 eV corresponds to sp 2 hybridized carbon (N-C = N) of g-C 3 N 4 , and the weaker one at 284.8 eV is assigned to graphitic carbon (C = C) of CQDs. The peak located at 286.0 eV is identified as a small quantity of carbon combined with C-N [26]. The N 1s spectrum ( Figure 3c) displays four peaks with binding energies of 398.5, 399.2, 401.2, and 404.8 eV, respectively, which are attributed to the sp 2 -hybridized nitrogen groups (N-C = N), tertiary nitrogen atoms (N-(C) 3 ), hydrogen-bonded nitrogen groups (C-N-H) and the charging effects or positive charge localization in the heterocycles, [27] respectively.…”

Section: Characterization Of Photocatalystsmentioning

confidence: 99%

Metal-Free Carbon Quantum Dots Implant Graphitic Carbon Nitride: Enhanced Photocatalytic Dye Wastewater Purification with Simultaneous Hydrogen Production

Zhang

Xia

et al. 2020

IJMS

View full text Add to dashboard Cite

The use of photocatalysts to purify wastewater and simultaneously convert solar energy into clean hydrogen energy is of considerable significance in environmental science. However, it is still a challenge due to their relatively high costs, low efficiencies, and poor stabilities. In this study, a metal-free carbon quantum dots (CQDs) modified graphitic carbon nitride photocatalyst (CCN) was synthesized by a facile method. The characterization and theoretical calculation results reveal that the incorporation of CQDs into the g-C3N4 matrix significantly improves the charge transfer and separation efficiency, exhibits a redshift of absorption edge, narrows the bandgap, and prevents the recombination of photoexcited carriers. The hydrogen production and simultaneous degradation of methylene blue (MB) or rhodamine B (RhB) in simulated wastewaters were further tested. In the simulated wastewater, the CCN catalyst showed enhanced photodegradation efficiency, accompanied with the increased hydrogen evolution rate (1291 µmol·h−1·g−1). The internal electrical field between the g-C3N4 and the CQDs is the main reason for the spatial separation of photoexcited electron-hole pairs. Overall, this work could offer a new protocol for the design of highly efficient photocatalysts for dye wastewater purification with simultaneous hydrogen production.

show abstract

Defects modified in the exfoliation of g-C3N4 nanosheets via a self-assembly process for improved hydrogen evolution performance

Cited by 87 publications

References 54 publications

New g-C3N4/GO/MoS2 composites as efficient photocatalyst for photocathodic protection of 304 stainless steel

New g-C3N4/GO/MoS2 composites as efficient photocatalyst for photocathodic protection of 304 stainless steel

TiN Bridged All‐Solid Z‐Scheme CNNS/TiN/TiO₂₋_x Heterojunction by a Facile In Situ Reduction Strategy for Enhanced Photocatalytic Hydrogen Evolution

Metal-Free Carbon Quantum Dots Implant Graphitic Carbon Nitride: Enhanced Photocatalytic Dye Wastewater Purification with Simultaneous Hydrogen Production

Contact Info

Product

Resources

About

Defects modified in the exfoliation of g-C3N4 nanosheets via a self-assembly process for improved hydrogen evolution performance

Cited by 87 publications

References 54 publications

New g-C3N4/GO/MoS2 composites as efficient photocatalyst for photocathodic protection of 304 stainless steel

New g-C3N4/GO/MoS2 composites as efficient photocatalyst for photocathodic protection of 304 stainless steel

TiN Bridged All‐Solid Z‐Scheme CNNS/TiN/TiO2−x Heterojunction by a Facile In Situ Reduction Strategy for Enhanced Photocatalytic Hydrogen Evolution

Metal-Free Carbon Quantum Dots Implant Graphitic Carbon Nitride: Enhanced Photocatalytic Dye Wastewater Purification with Simultaneous Hydrogen Production

Contact Info

Product

Resources

About

TiN Bridged All‐Solid Z‐Scheme CNNS/TiN/TiO₂₋_x Heterojunction by a Facile In Situ Reduction Strategy for Enhanced Photocatalytic Hydrogen Evolution