scholarly journals Construction of polymeric carbon nitride and dibenzothiophene dioxide-based intramolecular donor–acceptor conjugated copolymers for photocatalytic H2 evolution

2021 ◽  
Author(s):  
Fengtao Yu ◽  
Zhiqiang Wang ◽  
Shicong Zhang ◽  
Wenjun Wu ◽  
Haonan Ye ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
H2 Evolution ◽  
Donor Acceptor ◽  
Polymeric Carbon ◽  
Photocatalytic H2 Evolution ◽  
Conjugated Copolymers

A series of intramolecular g-C3N4-based donor–acceptor conjugated copolymers have been obtained by copolymerizing urea with 3,7-dihydroxydibenzo[b,d]thiophene 5,5-dioxide (SO). As a result, the AQY of CNSO-20 reached 10.16% at 420 nm.

scholarly journals A 3D Hierarchical Pancake-Like Porous Carbon Nitride for Highly Enhanced Visible-Light Photocatalytic H2 Evolution

Catalysts ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 77
Author(s):  
Xiaobin Qiu ◽  
Lingfang Qiu ◽  
Mengfan Ma ◽  
Yingying Hou ◽  
Shuwang Duo
Keyword(s):  
Visible Light ◽  
Porous Carbon ◽  
Carbon Nitride ◽  
Light Harvesting ◽  
Quantum Yields ◽  
Light Illumination ◽  
H2 Evolution ◽  
Photoelectric Properties ◽  
Polymeric Carbon ◽  
Photocatalytic H2 Evolution

Polymeric carbon nitride is a fascinating visible-light-response metal-free semiconductor photocatalyst in recent decades. Nevertheless, the photocatalytic H2 efficiency is unsatisfactory due to the insufficient visible-light harvesting capacity and low quantum yields caused by the bulky structure seriously limited its applications. To overcome these defects, in this research, a 3D hierarchical pancake-like porous carbon nitride (PPCN) was successfully fabricated by a facile bottom-up method. The as-prepared photocatalyst exhibit enlarged surface area, enriched reactive sites, improved charge carrier transformation and separation efficiency, and expanded bandgap with a more negative conduction band towardan enhanced reduction ability. All these features synergistically enhanced the photocatalytic H2 evolution efficiency of 3% Pt@PPCN (430 µmol g−1 h−1) under the visible light illumination (λ ≥ 420 nm), which was nine-fold higher than that of 3% Pt@bulk C3N4 (BCN) (45 µmol g−1 h−1). The improved structure and enhanced photoelectric properties were systematically investigated by different characterization techniques. This research may provide an insightful synthesis strategy for polymeric carbon nitride with excellent light-harvesting capacity and enhanced separation of charges toward remarkable photocatalytic H2 for water splitting.

Accurate engineering of hexagonal hollow carbon nitride with carbon vacancies: Enhanced photocatalytic H2 evolution and its mechanism

2021 ◽  
Author(s):  
Xueru Chen ◽  
Xin Li ◽  
Xue Li ◽  
Huimin Lu ◽  
Lei Wang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Carbon Nitride ◽  
Cyanuric Acid ◽  
The Self ◽  
H2 Evolution ◽  
Hollow Carbon ◽  
Photocatalytic H2 Evolution

Vacancy engineering and morphology construction were integrated simultaneously by the self-assembly of melamine (MA) and cyanuric acid (CA) in the presence of P123 and H2SO4, which contributed to the hexagonal...

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