scholarly journals Enhancing Charge Separation in Conjugated Microporous Polymers for Efficient Photocatalytic Hydrogen Evolution

2021 ◽  
Author(s):  
Zhuangfei Qian ◽  
Yajie Yan ◽  
Ziqi Liang ◽  
Xiaodong Zhuang ◽  
Kai A. I. Zhang
Keyword(s):  
Hydrogen Evolution ◽  
Organic Semiconductor ◽  
Charge Separation ◽  
High Efficiency ◽  
Photogenerated Electron ◽  
Limiting Factors ◽  
Electron Hole ◽  
Photocatalytic Hydrogen Evolution ◽  
Microporous Polymers ◽  
Conjugated Microporous Polymers

The fast recombination of photogenerated electron-hole pairs after charge separation is one of the main limiting factors for achieving high efficiency of organic semiconductor photocatalysts. Herein, we report a conjugated...

Pyrene-containing conjugated organic microporous polymers for photocatalytic hydrogen evolution from water

2021 ◽  
Author(s):  
Mohamed Gamal Mohamed ◽  
Mohamed Hammad Elsayed ◽  
Ahmed M. Elewa ◽  
Ahmed F. M. EL-Mahdy ◽  
Cheng-Han Yang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
High Stability ◽  
Photocatalytic Hydrogen Evolution ◽  
Microporous Polymers ◽  
Very High ◽  
Conjugated Microporous Polymers ◽  
Production Efficiencies

Pyrene based conjugated microporous polymers (CMPs) as photocatalysts with promising H2 production efficiencies and very high stability.

Substituent effect of conjugated microporous polymers on the photocatalytic hydrogen evolution activity

2020 ◽  
Vol 8 (5) ◽  
pp. 2404-2411 ◽  
Author(s):  
Xiaomin Gao ◽  
Chang Shu ◽  
Chong Zhang ◽  
Wenyan Ma ◽  
Shi-Bin Ren ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Evolution ◽  
Substituent Effect ◽  
Evolution Rate ◽  
Photocatalytic Hydrogen Evolution ◽  
Microporous Polymers ◽  
Hydrogen Evolution Rate ◽  
Conjugated Microporous Polymers

The influence of substituent groups on the photocatalytic activity of conjugated microporous polymers was investigated, and a high photocatalytic hydrogen evolution rate of 18.93 mmol h−1 g−1 was achieved by PyDF with fluorine atoms.

Photocatalytic Hydrogen Evolution from Water Using Heterocyclic Conjugated Microporous Polymers: Porous or Non-Porous?

2018 ◽  
Author(s):  
Reiner Sebastian Sprick ◽  
Yang Bai ◽  
Catherine M. Aitchison ◽  
Duncan J. Woods ◽  
Andrew I. Cooper
Keyword(s):  
Hydrogen Evolution ◽  
External Quantum Efficiency ◽  
Structural Analog ◽  
Linear Polymers ◽  
Porous Network ◽  
Photocatalytic Hydrogen Evolution ◽  
Microporous Polymers ◽  
Porous Networks ◽  
Hole Scavenger ◽  
Conjugated Microporous Polymers

<p>Three series of conjugated microporous polymers (CMPs) were studied as photocatalysts for producing hydrogen from water using a sacrificial hole-scavenger. In all cases, dibenzo[<i>b</i>,<i>d</i>]thiophene sulfone polymers outperformed their fluorene analogs. A porous network, S-CMP3, showed the highest hydrogen evolution rate of 6076 µmol h<sup>-1</sup> g<sup>-1</sup> (λ > 295 nm) and 3106 µmol h<sup>-1</sup> g<sup>-1</sup> (λ > 420 nm), with an external quantum efficiency of 13.2% at 420 nm. S-CMP3 outperforms its linear structural analog, P35, while in other cases, non-porous linear polymers are superior to equivalent porous networks. This suggests that microporosity can be beneficial for sacrificial photocatalytic hydrogen evolution, but not for all monomer combinations.</p>

scholarly journals Extended conjugated microporous polymers for photocatalytic hydrogen evolution from water

2016 ◽  
Vol 52 (65) ◽  
pp. 10008-10011 ◽  
Author(s):  
Reiner Sebastian Sprick ◽  
Baltasar Bonillo ◽  
Michael Sachs ◽  
Rob Clowes ◽  
James R. Durrant ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Hydrogen Evolution ◽  
Electron Donor ◽  
Photocatalytic Hydrogen Evolution ◽  
Microporous Polymers ◽  
Conjugated Microporous Polymers

Conjugated microporous polymers (CMPs) have been used as photocatalysts for hydrogen production from water in the presence of a sacrificial electron donor.

Perylene-Containing Conjugated Microporous Polymers for Photocatalytic Hydrogen Evolution

2017 ◽  
Vol 218 (14) ◽  
pp. 1700049 ◽  
Author(s):  
Yunfeng Xu ◽  
Na Mao ◽  
Shi Feng ◽  
Chong Zhang ◽  
Feng Wang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Photocatalytic Hydrogen Evolution ◽  
Microporous Polymers ◽  
Conjugated Microporous Polymers

Regulating Charge‐Transfer in Conjugated Microporous Polymers for Photocatalytic Hydrogen Evolution

2019 ◽  
Vol 25 (15) ◽  
pp. 3867-3874 ◽  
Author(s):  
Venkata Suresh Mothika ◽  
Papri Sutar ◽  
Parul Verma ◽  
Shubhajit Das ◽  
Swapan K. Pati ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Hydrogen Evolution ◽  
Photocatalytic Hydrogen Evolution ◽  
Microporous Polymers ◽  
Conjugated Microporous Polymers

scholarly journals Flower-Like Dual-Defective Z-Scheme Heterojunction g-C3N4/ZnIn2S4 High-Efficiency Photocatalytic Hydrogen Evolution and Degradation of Mixed Pollutants

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2483
Author(s):  
Linlin Hou ◽  
Zhiliang Wu ◽  
Chun Jin ◽  
Wei Li ◽  
Qiuming Wei ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Active Sites ◽  
High Efficiency ◽  
Three Dimensional ◽  
Photogenerated Electron ◽  
Mixed Solution ◽  
Defect Engineering ◽  
Nano Structure ◽  
Photocatalytic Hydrogen Evolution ◽  
Degradation Rates

Graphitic carbon nitride (g-C3N4) with a porous nano-structure, nitrogen vacancies, and oxygen-doping was prepared by the calcination method. Then, it was combined with ZnIn2S4 nanosheets containing zinc vacancies to construct a three-dimensional (3D) flower-like Z-scheme heterojunction (pCN-N/ZIS-Z), which was used for photocatalytic hydrogen evolution and the degradation of mixed pollutants. The constructed Z-scheme heterojunction improved the efficiency of photogenerated charges separation and migration, and the large surface area and porous characteristics provided more active sites. Doping and defect engineering can change the bandgap structure to improve the utilization of visible light, and can also capture photogenerated electrons to inhibit recombination, so as to promote the use of photogenerated electron-hole pairs in the photocatalytic redox process. Heterojunction and defect engineering synergized to form a continuous and efficient conductive operation framework, which achieves the hydrogen production of pCN-N/ZIS-Z (9189.8 µmol·h−1·g−1) at 58.9 times that of g-C3N4 (155.9 µmol·h−1·g−1), and the degradation rates of methyl orange and metronidazole in the mixed solution were 98.7% and 92.5%, respectively. Our research provides potential ideas for constructing a green and environmentally friendly Z-scheme heterojunction catalyst based on defect engineering to address the energy crisis and environmental restoration.

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