Distinctive defects engineering in graphitic carbon nitride for greatly extended visible light photocatalytic hydrogen evolution

Niu, Ping; Qiao, Man; Li, Yafei; Huang, Liang; Zhai, Tianyou

doi:10.1016/j.nanoen.2017.11.059

Cited by 433 publications

(283 citation statements)

References 55 publications

Supporting

Mentioning

254

Contrasting

Order By: Relevance

“…However, m CNN displays a broad peak centered at 406.3 eV, corresponding to electron transition from the N 1s to C‐N σ* orbital . The above results categorically confirm the presence of ‐C≡N in m CNN …”

Section: Resultssupporting

confidence: 75%

Potassium‐Ion‐Assisted Regeneration of Active Cyano Groups in Carbon Nitride Nanoribbons: Visible‐Light‐Driven Photocatalytic Nitrogen Reduction

Wang

Zhang

et al. 2019

Angewandte Chemie

View full text Add to dashboard Cite

As a metal‐free nitrogen reduction reaction (NRR) photocatalyst, g‐C3N4 is available from a scalable synthesis at low cost. Importantly, it can be readily functionalized to enhance photocatalytic activities. However, the use of g‐C3N4‐based photocatalysts for the NRR has been questioned because of the elusive mechanism and the involvement of N defects. This work reports the synthesis of a g‐C3N4 photocatalyst modified with cyano groups and intercalated K+ (mCNN), possessing extended visible‐light harvesting capacity and superior photocatalytic NRR activity (NH3 yield: 3.42 mmol g−1 h−1). Experimental and theoretical studies suggest that the ‐C≡N in mCNN can be regenerated through a pathway analogous to Mars van Krevelen process with the aid of the intercalated K+. The results confirm that the regeneration of the cyano group not only enhances photocatalytic activity and sustains the catalytic cycle, but also stabilizes the photocatalyst.

show abstract

Section: Resultssupporting

confidence: 75%

Potassium‐Ion‐Assisted Regeneration of Active Cyano Groups in Carbon Nitride Nanoribbons: Visible‐Light‐Driven Photocatalytic Nitrogen Reduction

Wang

Zhang

et al. 2019

Angewandte Chemie

View full text Add to dashboard Cite

show abstract

“…To date, a good library of nanostructures has been designed in photocatalysis, including 0D quantum dots, 1D nanowires/nanorods, 2D nanosheets, 3D nanostructures, and so on, which can endow the catalysts with characteristic geometric and electronic structures, showing the different physicochemical properties and activities. In addition, with the understanding of the photocatalytic process, component control strategies (e.g., heterojunction, defects, solid solution, and doping) have been well acknowledged in the broadening absorption of solar light, accelerating conductivity for charge migration and boosting fast kinetics for surface reactions. Hence, both structural and component regulation play a vital role in semiconductor modification to achieve high‐efficiency photocatalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Mo‐Doped ZnIn₂S₄ Flower‐Like Hollow Microspheres for Improved Visible Light‐Driven Hydrogen Evolution

2019

View full text Add to dashboard Cite

Designing robust visible light‐driven photocatalysts in terms of the structure and component is an important way for achieving efficient solar hydrogen production. Herein, Mo‐doped ZnIn2S4 (M‐ZIS) flower‐like hollow microspheres assembled by ultrathin nanosheets are reported. The as‐prepared M‐ZIS samples achieve an enhanced H2 generation rate of 4.62 mmol g−1 h−1 under visible light, ten times higher than that of pristine ZIS. The 3D hollow microspheres structure assembled by nanosheets ensures sufficient light harvesting and exposure of more active sites. Meanwhile, the doping of Mo is propitious to regulate the chemical characteristic and electronic structure of ZIS in the merit of ameliorated hydrophilicity, extended light adsorption, accelerated transfer‐separation efficiency of charge carriers, as well as the reduced overpotential of H2 evolution. This model is put forward to obtain an in‐depth understanding of the role that both the 3D hollow hierarchical structure and doping atoms play in photocatalytic water splitting.

show abstract

“…As shown in Figure a, the BCN and HDCN show a similar crystalline structure. Both of them exhibit two diffraction peaks at 13.1° (100) and 27.3° (002), representing the in‐plane structural packing motif and the inter layer stacking of the conjugated aromatic systems, respectively . Comparison with BCN, the last peak of HDCN shifts slightly from 27.3° to 27.5°, suggesting a decrease in the interlayer stacking distance .…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photocatalytic Hydrogen Evolution of the Hydrogenated Deficient g‐C₃N₄ via Surface Hydrotreating

et al. 2019

View full text Add to dashboard Cite

Unreacted amino groups (−NHx) existed in the bulk g‐C3N4 always act as charge trap sites which resulting in low photocatalytic activity. In this paper, the hydrogenated deficient g‐C3N4 (HDCN) was prepared by calcining bulk g‐C3N4 with NaBH4 under an inert atmosphere. It was found that −NHx groups were absolutely reduced into both nitrogen vacancies and the cyano groups (−C≡N groups) in the frameworks of g‐C3N4 after this surface hydrotreating. Therefore, the photo‐induced carrier recombination is suppressed dues to the disappeared −NHx groups. As a result, the HDCN sample displayed a higher photocatalytic H2 evolution activity than the bulk g‐C3N4.

show abstract

Distinctive defects engineering in graphitic carbon nitride for greatly extended visible light photocatalytic hydrogen evolution

Cited by 433 publications

References 55 publications

Potassium‐Ion‐Assisted Regeneration of Active Cyano Groups in Carbon Nitride Nanoribbons: Visible‐Light‐Driven Photocatalytic Nitrogen Reduction

Potassium‐Ion‐Assisted Regeneration of Active Cyano Groups in Carbon Nitride Nanoribbons: Visible‐Light‐Driven Photocatalytic Nitrogen Reduction

Mo‐Doped ZnIn₂S₄ Flower‐Like Hollow Microspheres for Improved Visible Light‐Driven Hydrogen Evolution

Enhanced Photocatalytic Hydrogen Evolution of the Hydrogenated Deficient g‐C₃N₄ via Surface Hydrotreating

Contact Info

Product

Resources

About

Distinctive defects engineering in graphitic carbon nitride for greatly extended visible light photocatalytic hydrogen evolution

Cited by 433 publications

References 55 publications

Potassium‐Ion‐Assisted Regeneration of Active Cyano Groups in Carbon Nitride Nanoribbons: Visible‐Light‐Driven Photocatalytic Nitrogen Reduction

Potassium‐Ion‐Assisted Regeneration of Active Cyano Groups in Carbon Nitride Nanoribbons: Visible‐Light‐Driven Photocatalytic Nitrogen Reduction

Mo‐Doped ZnIn2S4 Flower‐Like Hollow Microspheres for Improved Visible Light‐Driven Hydrogen Evolution

Enhanced Photocatalytic Hydrogen Evolution of the Hydrogenated Deficient g‐C3N4 via Surface Hydrotreating

Contact Info

Product

Resources

About

Mo‐Doped ZnIn₂S₄ Flower‐Like Hollow Microspheres for Improved Visible Light‐Driven Hydrogen Evolution

Enhanced Photocatalytic Hydrogen Evolution of the Hydrogenated Deficient g‐C₃N₄ via Surface Hydrotreating