scholarly journals Gas-Phase Fluorination of g-C3N4 for Enhanced Photocatalytic Hydrogen Evolution

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 37
Author(s):  
Lidong Sun ◽  
Yu Li ◽  
Wei Feng
Keyword(s):  
Photocatalytic Activity ◽  
Theoretical Calculations ◽  
Specific Area ◽  
Photogenerated Carrier ◽  
H2 Evolution ◽  
Mixed Gas ◽  
Vacancy Defects ◽  
Carrier Recombination ◽  
Vacancy Generation ◽  
Photogenerated Charge Separation

Graphitic carbon nitride (g-C3N4) has attracted much attention because of its potential for application in solar energy conservation. However, the photocatalytic activity of g-C3N4 is limited by the rapidly photogenerated carrier recombination and insufficient solar adsorption. Herein, fluorinated g-C3N4 (F-g-CN) nanosheets are synthesized through the reaction with F2/N2 mixed gas directly. The structural characterizations and theoretical calculations reveal that fluorination introduces N vacancy defects, structural distortion and covalent C-F bonds in the interstitial space simultaneously, which lead to mesopore formation, vacancy generation and electronic structure modification. Therefore, the photocatalytic activity of F-g-CN for H2 evolution under visible irradiation is 11.6 times higher than that of pristine g-C3N4 because of the enlarged specific area, enhanced light harvesting and accelerated photogenerated charge separation after fluorination. These results show that direct treatment with F2 gas is a feasible and promising strategy for modulating the texture and configuration of g-C3N4-based semiconductors to drastically enhance the photocatalytic H2 evolution process.

scholarly journals Strongly Enhancing Photocatalytic Activity of TiO2 Thin Films by Multi-Heterojunction Technique

Catalysts ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 440 ◽  
Author(s):  
Hsyi-En Cheng ◽  
Chi-Hsiu Hung ◽  
Ing-Song Yu ◽  
Zu-Po Yang
Keyword(s):  
Photocatalytic Activity ◽  
Tio2 Film ◽  
Schottky Contact ◽  
Band Alignment ◽  
Photogenerated Carrier ◽  
Photoluminescence Intensity ◽  
Heterojunction Structure ◽  
Recombination Loss ◽  
Carrier Recombination ◽  
Carrier Separation

The photocatalysts of immobilized TiO2 film suffer from high carrier recombination loss when compared to its powder form. Although the TiO2 with rutile-anatase mixed phases has higher carrier separation efficiency than those with pure anatase or rutile phase, the single junction of anatase/rutile cannot avoid the recombination of separated carriers at the interface. In this study, we propose a TiO2/SnO2/Ni multi-heterojunction structure which incorporates both Schottky contact and staggered band alignment to reduce the carrier recombination loss. The low carrier recombination rate of TiO2 film in TiO2/SnO2/Ni multi-heterojunction structure was verified by its low photoluminescence intensity. The faster degradation of methylene blue for TiO2/SnO2/Ni multi-junctions than for the other fabricated structures, which means that the TiO2 films grown on the SnO2/Ni/Ti coated glass have a much higher photocatalytic activity than those grown on the blank glass, SnO2-coated and Ni/Ti-coated glasses, demonstrated its higher performance of photogenerated carrier separation.

MoS2 quantum dot-modified Ag/polyaniline composites with enhanced photogenerated carrier separation for highly efficient visible light photocatalytic H2 evolution performance

2017 ◽  
Vol 7 (16) ◽  
pp. 3531-3538 ◽  
Author(s):  
Xiufang Wang ◽  
Shaohua Chen ◽  
Miaomiao Zhang ◽  
Youyou Huang ◽  
Shaojie Feng ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Quantum Dot ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Photogenerated Carrier ◽  
H2 Evolution ◽  
Carrier Separation ◽  
Polyaniline Composites ◽  
Photocatalytic H2 Evolution ◽  
Visible Light Photocatalytic

Uniform heterostructured MoS2 QDs–Ag/PANI composites are fabricated, which exhibit significantly enhanced photocatalytic activity for H2 production under visible light irradiation.

A renewable photocatalytic system with dramatic photocatalytic activity for H2 evolution and constant light energy utilization: Eosin Y sensitized ZnWO4 nanoplates loaded with CuO nanoparticles

2021 ◽  
Author(s):  
Xiaoluo Bao ◽  
Xiaokun Wang ◽  
Xiangqing Li ◽  
Lixia Qin ◽  
Taiyang Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Light Intensity ◽  
Incident Light ◽  
Cuo Nanoparticles ◽  
Energy Utilization ◽  
Limited Attention ◽  
Eosin Y ◽  
H2 Evolution ◽  
Incident Light Intensity ◽  
Photocatalytic System

It is necessary for the commercialization of sunlight-driven H2 evolution to develop an efficient photocatalytic system whose energy utilization is independent on incident light intensity. Unfortunately, limited attention has been...

Fabrication of flower-like Sn3O4 hierarchical nanostructure and its photocatalytic activity for H2 evolution from water

2019 ◽  
Vol 106 ◽  
pp. 116-119 ◽  
Author(s):  
Linghui Sun ◽  
Hanmin Xiao ◽  
Sunan Cong ◽  
Yanjie Hao ◽  
Mengru Xue ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
H2 Evolution ◽  
Hierarchical Nanostructure

CdSe Quantum Dots/White Graphene Hexagonal Porous Boron Nitride Sheet (h-PBNs) Heterostructure Photocatalyst for Solar Driven H2 Production

2021 ◽  
Author(s):  
Raheman Shakeelur ◽  
Rupali S. Mane ◽  
Higgins Wilson ◽  
Neetu Jha
Keyword(s):  
Active Site ◽  
Charge Separation ◽  
High Surface ◽  
High Surface Area ◽  
H2 Production ◽  
H2 Evolution ◽  
The World ◽  
2D Nanomaterials ◽  
White Graphene ◽  
Photogenerated Charge Separation

In the world of photocatalytic hydrogen (H2) evolution two-dimensional (2D) nanomaterials have attracted widespread attention owing to their high surface area, abundant active site, and excellent photogenerated charge separation properties....

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