Metal organic framework derived heteroatoms and cyano ( C N) group co-decorated porous g-C3N4 nanosheets for improved photocatalytic H2 evolution and uranium(VI) reduction

Gao, Haijun; Xu, Jinzhang; Zhou, Juntian; Zhang, Shouwei; Zhou, Ru

doi:10.1016/j.jcis.2020.02.091

Cited by 48 publications

(2 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The bands at 1200-1700 cm −1 are assigned to the conjugated C-N heterocycles [31]. The broad peak at 3500-2900 cm −1 originates from the terminal amino groups or absorbed hydroxyl species [32]. Obviously, all these peaks became stronger in CN-A, indicating more exposure of surface functional groups in PCN after AOM treatment [26,33].…”

Section: Resultsmentioning

confidence: 99%

增强π共轭结构的电子密度和面内电荷输运促进g-C3N4的光催化析氢

et al. 2023

View full text Add to dashboard Cite

Graphite carbon nitride (g-C 3 N 4 ) has become an emerging metal-free photocatalyst and attracted the attention of researchers. However, pure g-C 3 N 4 (PCN) prepared by traditional thermal condensation polymerization has a low polymerization of heptazine ring chains and a large number of charge recombination centers, which hinder in-plane charge transport, leading to undesirable photocatalytic performance. Herein, PCN fabrication by thermal treatment with ammonium oxalate monohydrate was performed to produce highly dispersed porous g-C 3 N 4 nanosheets, and the integrity of their in-plane heptazine ring chains was successfully improved without introducing heteroatoms. Electron paramagnetic resonance and 13 C nuclear magnetic resonance analyses revealed significantly increased electron density and delocalization of the π-conjugated structure. The obtained samples exhibited acceptable stability and photocatalytic activity, and the hydrogen reduction rates without and with the Pt co-catalyst were 11.2 and 5.3 times that of PCN.

show abstract

Section: Resultsmentioning

confidence: 99%

增强π共轭结构的电子密度和面内电荷输运促进g-C3N4的光催化析氢

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Metal organic frameworks (MOFs) are a class of crystalline 3D framework compounds with a very high surface area and porosity, which are essential for CO 2 encapsulation before photoreduction. In addition to exhibiting a high storage property, some MOFs also demonstrate a semiconducting nature, and in combination with g-C 3 N 4 , the composite can show higher charge separation and a lower rate of recombination of photogenerated excitons. − The synthesis approaches involved in situ synthesis of MOFs in the presence of g-C 3 N 4 , or heat treatment to produce core–shell structures …”

Section: Graphitic C3n4 As Photocatalyst For Co2 Reductionmentioning

confidence: 99%

Tale of Two Layered Semiconductor Catalysts toward Artificial Photosynthesis

Roy

2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

The ever-increasing reliance on nonrenewable fossil fuels due to massive urbanization and industrialization created problems such as depletion of the primary feedstock and raised the atmospheric CO2 levels causing global warming. A smart and promising approach is artificial photosynthesis that photocatalytically valorizes CO2 into high-value chemicals. The inexpensive layered semiconductors like g-C3N4 and rGO or GO have the potential to make the process practically feasible for real applications. The suitable band positions with respect to the reduction potentials coupled with the typical surface properties of these layered semiconductors play a beneficial role in photoreduction of CO2. Additionally, the creation of heterojunction interfaces to achieve the Z-scheme by anchoring g-C3N4 and rGO with another semiconductor with proper band alignment and dispersing plasmonic nano metals to obtain Schottky barriers on the layered surfaces also help retarding the electron–hole recombination and boost up the catalytic efficacy. Extensive exploration happened in recent years toward artificial photosynthesis over these materials, which needs a critical compendium. Surprisingly, in spite of the recent explosion of studies on photocatalytic reduction of CO2 over metal-free semiconductors, there is not a single review on comparing the mechanistic aspects of photoreduction of CO2 over the layered semiconductors g-C3N4 and rGO. This review stands out as a unique documentation, where the mechanism of photocatalytic reduction of CO2 over this set of materials is critically examined in the context of band and surface modifications. An overall conclusion and outlook at the end indicates the need to develop prototypes for artificial photosynthesis with these well-studied semiconducting layered materials to yield solar fuels.

show abstract

Cyano‐Rich g‐C₃N₄ in Photochemistry: Design, Applications, and Prospects

Jing,

Xu,

Xie

et al. 2023

Small

View full text Add to dashboard Cite

Cyano‐rich g‐C3N4 materials are widely used in various fields of photochemistry due to the very powerful electron‐absorbing ability and electron storage function of cyano, as well as its advantages in improving light absorption, adjusting the energy band structure, increasing the polarization rate and electron density in the structure, active site concentration, and promoting oxygen activation ability. Notwithstanding, there is yet a huge knowledge break in the design, preparation, detection, application, and prospect of cyano‐rich g‐C3N4. Accordingly, an overall review is arranged to substantially comprehend the research progress and position of cyano‐rich g‐C3N4 materials. An overall overview of the current research position in the synthesis, characterization (determination of their location and quantity), application, and reaction mechanism analysis of cyano‐rich g‐C3N4 materials to provide a quantity of novel suggestions for cyano‐modified carbon nitride materials' construction is provided. In view of the prevailing challenges and outlooks of cyano‐rich g‐C3N4 materials, this paper will purify the growth direction of cyano‐rich g‐C3N4, to achieve a more in‐depth exploration and broaden the applications of cyano‐rich g‐C3N4.

show abstract

Metal organic framework derived heteroatoms and cyano ( C N) group co-decorated porous g-C3N4 nanosheets for improved photocatalytic H2 evolution and uranium(VI) reduction

Cited by 48 publications

References 49 publications

增强π共轭结构的电子密度和面内电荷输运促进g-C3N4的光催化析氢

增强π共轭结构的电子密度和面内电荷输运促进g-C3N4的光催化析氢

Tale of Two Layered Semiconductor Catalysts toward Artificial Photosynthesis

Cyano‐Rich g‐C₃N₄ in Photochemistry: Design, Applications, and Prospects

Contact Info

Product

Resources

About

Metal organic framework derived heteroatoms and cyano ( C N) group co-decorated porous g-C3N4 nanosheets for improved photocatalytic H2 evolution and uranium(VI) reduction

Cited by 48 publications

References 49 publications

增强π共轭结构的电子密度和面内电荷输运促进g-C3N4的光催化析氢

增强π共轭结构的电子密度和面内电荷输运促进g-C3N4的光催化析氢

Tale of Two Layered Semiconductor Catalysts toward Artificial Photosynthesis

Cyano‐Rich g‐C3N4 in Photochemistry: Design, Applications, and Prospects

Contact Info

Product

Resources

About

Cyano‐Rich g‐C₃N₄ in Photochemistry: Design, Applications, and Prospects