Hybrid Graphene and Graphitic Carbon Nitride Nanocomposite: Gap Opening, Electron–Hole Puddle, Interfacial Charge Transfer, and Enhanced Visible Light Response

2012 ◽  
Vol 134 (9) ◽  
pp. 4393-4397 ◽  
Author(s):  
Aijun Du ◽  
Stefano Sanvito ◽  
Zhen Li ◽  
Dawei Wang ◽  
Yan Jiao ◽  
...  
Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 983 ◽  
Author(s):  
I. Neelakanta Reddy ◽  
N. Jayashree ◽  
V. Manjunath ◽  
Dongseob Kim ◽  
Jaesool Shim

Recently, the engineering of optical bandgaps and morphological properties of graphitic carbon nitride (g-C3N4) has attracted significant research attention for photoelectrodes and environmental remediation owing to its low-cost synthesis, availability of raw materials, and thermal physical–chemical stability. However, the photoelectrochemical activity of g-C3N4-based photoelectrodes is considerably poor due to their high electron–hole recombination rate, poor conductivity, low quantum efficiency, and active catalytic sites. Synthesized Ni metal-doped g-C3N4 nanostructures can improve the light absorption property and considerably increase the electron–hole separation and charge transfer kinetics, thereby initiating exceptionally enhanced photoelectrochemical activity under visible-light irradiation. In the present study, Ni dopant material was found to evince a significant effect on the structural, morphological, and optical properties of g-C3N4 nanostructures. The optical bandgap of the synthesized photoelectrodes was varied from 2.53 to 2.18 eV with increasing Ni dopant concentration. The optimized 0.4 mol% Ni-doped g-C3N4 photoelectrode showed a noticeably improved six-fold photocurrent density compared to pure g-C3N4. The significant improvement in photoanode performance is attributable to the synergistic effects of enriched light absorption, enhanced charge transfer kinetics, photoelectrode/aqueous electrolyte interface, and additional active catalytic sites for photoelectrochemical activity.


RSC Advances ◽  
2017 ◽  
Vol 7 (4) ◽  
pp. 2333-2341 ◽  
Author(s):  
Yanfang Yang ◽  
Jingjing Chen ◽  
Zhiyong Mao ◽  
Na An ◽  
Dajian Wang ◽  
...  

Ultrathin graphitic carbon nitride (UGCN) nanosheets with an extended region of visible light response and enhanced surface area were constructed for a significant enhancement in photocatalysis.


2015 ◽  
Vol 17 (44) ◽  
pp. 29867-29873 ◽  
Author(s):  
Jun-ichi Fujisawa ◽  
Ryuki Muroga ◽  
Minoru Hanaya

A visible light response of TiO2 due to interfacial charge-transfer transitions was obtained by the addition of benzenedithiol at room temperature.


Author(s):  
Jing Chen ◽  
Yage Zhang ◽  
Baofan Wu ◽  
Zhichao Ning ◽  
Miaoyan Song ◽  
...  

Abstract Porous graphitic carbon nitride (p-C3N4) was fabricated via simply pyrolyzing treatment of graphitic carbon nitride (g-C3N4). The defects could be introduced into the structure of g-C3N4 by the broken of some bonds, which was beneficial for the generation of electron-hole pairs and restraining their recombination. Compared with g-C3N4, p-C3N4 showed a narrow band gap to promote the utilization of visible light. Furthermore, the porous structure also increased the specific surface area to maximize the exposure of active sites and promote the mass transfer during photodegradation. As a result, the as-reported p-C3N4 exhibited considerably higher degradation efficiency for Rhodamine B (RhB) and Methyl Orange (MO) than that of pristine g-C3N4. Moreover, the photocatalyst showed high durability and stability in recycling experiments.


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