Two consecutive postsynthetic modifications of benzothiadiazole-based conjugated polymer for enhanced photocatalytic H2 evolution: the significance of sulfinyl group

2021 ◽  
Author(s):  
Xiaodong Zhao ◽  
Bo Chen ◽  
Wenbo Dong ◽  
Shengyao Wang ◽  
Yonggang Xiang ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
H2 Evolution ◽  
Donor Acceptor ◽  
Sulfinyl Group ◽  
Photocatalytic H2 Evolution

Donor/Acceptor (D-A) conjugated polymers recently represent a promising platform for photocatalytic H2 evolution, and a variety of methods have been developed to expand the libray of conjugated polymer based candidates....

scholarly journals Conjugated Polymer Donor-Molecular Acceptor Nanohybrids for Photocatalytic Hydrogen Evolution

2019 ◽  
Author(s):  
Haofan Yang ◽  
Xiaobo Li ◽  
Reiner Sebastian Sprick ◽  
Andrew I. Cooper
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Conjugated Polymers ◽  
Hydrogen Evolution ◽  
Conjugated Polymer ◽  
Apparent Quantum Yield ◽  
High Hydrogen ◽  
Photocatalytic Hydrogen Evolution ◽  
Efficient Charge ◽  
Donor Acceptor

A library of 237 organic binary/ternary nanohybrids consisting of conjugated polymers donors and both fullerene and non-fullerene molecular acceptors was prepared and screened for sacrificial photocatalytic hydrogen evolution. These donor-acceptor nanohybrids (DANHs) showed significantly enhanced hydrogen evolution rates compared with the parent donor or acceptor compounds. DANHs of <a></a><a>a polycarbazole</a>-based donor combined with a methanofullerene acceptor (PCDTBT/PC<sub>60</sub>BM) showed a high hydrogen evolution rate of 105.2 mmol g<sup>-1</sup> h<sup>-1</sup> under visible light (λ > 420 nm). This DANH photocatalyst produced 5.9 times more hydrogen than a sulfone-containing polymer (P10) under the same conditions, which is one of the most efficient organic photocatalysts reported so far. An apparent quantum yield of hydrogen evolution of 3.0 % at 595 nm was measured for this DANH. The photocatalytic activity of the DANHs, which in optimized cases reached 179.0 mmol g<sup>-1</sup> h<sup>-1</sup>, is attributed to efficient charge transfer at the polymer donor/molecular acceptor interface. We also show that ternary donor<sub>A</sub>-donor<sub>B</sub>-acceptor nanohybrids can give higher activities than binary donor-acceptor hybrids in some cases.

Exploration and development of gold- and silver-catalyzed cross dehydrogenative coupling toward donor–acceptor π-conjugated polymer synthesis

2019 ◽  
Vol 10 (4) ◽  
pp. 486-493 ◽  
Author(s):  
Lauren J. Kang ◽  
Liwen Xing ◽  
Christine K. Luscombe
Keyword(s):  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
Polymer Synthesis ◽  
Dehydrogenative Coupling ◽  
Donor Acceptor ◽  
First Time ◽  
Exploration And Development

The synthesis of donor–acceptor conjugated polymers using Au- and Ag-catalyzed cross dehydrogenative coupling was achieved for the first time.

scholarly journals Conjugated Polymer Donor-Molecular Acceptor Nanohybrids for Photocatalytic Hydrogen Evolution

2019 ◽  
Author(s):  
Haofan Yang ◽  
Xiaobo Li ◽  
Reiner Sebastian Sprick ◽  
Andrew I. Cooper
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Conjugated Polymers ◽  
Hydrogen Evolution ◽  
Conjugated Polymer ◽  
Apparent Quantum Yield ◽  
High Hydrogen ◽  
Photocatalytic Hydrogen Evolution ◽  
Efficient Charge ◽  
Donor Acceptor

A library of 237 organic binary/ternary nanohybrids consisting of conjugated polymers donors and both fullerene and non-fullerene molecular acceptors was prepared and screened for sacrificial photocatalytic hydrogen evolution. These donor-acceptor nanohybrids (DANHs) showed significantly enhanced hydrogen evolution rates compared with the parent donor or acceptor compounds. DANHs of <a></a><a>a polycarbazole</a>-based donor combined with a methanofullerene acceptor (PCDTBT/PC<sub>60</sub>BM) showed a high hydrogen evolution rate of 105.2 mmol g<sup>-1</sup> h<sup>-1</sup> under visible light (λ > 420 nm). This DANH photocatalyst produced 5.9 times more hydrogen than a sulfone-containing polymer (P10) under the same conditions, which is one of the most efficient organic photocatalysts reported so far. An apparent quantum yield of hydrogen evolution of 3.0 % at 595 nm was measured for this DANH. The photocatalytic activity of the DANHs, which in optimized cases reached 179.0 mmol g<sup>-1</sup> h<sup>-1</sup>, is attributed to efficient charge transfer at the polymer donor/molecular acceptor interface. We also show that ternary donor<sub>A</sub>-donor<sub>B</sub>-acceptor nanohybrids can give higher activities than binary donor-acceptor hybrids in some cases.

scholarly journals Synergistic effects of Ni and Cu supported on TiO2 and SiO2 on photocatalytic H2 evolution with an electron donor–acceptor linked molecule

2015 ◽  
Vol 5 (2) ◽  
pp. 979-988 ◽  
Author(s):  
Yusuke Yamada ◽  
Shinya Shikano ◽  
Tomoki Akita ◽  
Shunichi Fukuzumi
Keyword(s):  
Electron Donor ◽  
Synergistic Effects ◽  
H2 Evolution ◽  
System P ◽  
Photocatalytic System ◽  
Donor Acceptor ◽  
Photocatalytic H2 Evolution

Ni and Cu supported on TiO2 or SiO2 synergistically acted as H2 evolution catalysts in a photocatalytic system.

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 Characterization of large area flexible plastic solar cells based on conjugated polymer/fullerene composites

1999 ◽  
Vol 1 (2) ◽  
pp. 95-99 ◽  
Author(s):  
Desta Gebeyehu ◽  
F. Padinger ◽  
C. J. Brabec ◽  
T. Fromherz ◽  
J. C. Hummelen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
Collection Efficiency ◽  
Production Costs ◽  
Large Area ◽  
Fullerene Derivatives ◽  
Donor Acceptor ◽  
Carrier Collection ◽  
Plastic Solar Cells

The development of solar cells based on composites of organic conjugated semi-conducting polymers with fullerene derivatives can provide a new method in the exploitation of solar energy. Organic solar cells must fulfill the criteria of stability, efficiency and reduction of production costs to find new applications. Specially, the bulk donor-acceptor heterojunctions between conjugated polymers and fullerenes have been successfully utilized for photovoltaic devices with high carrier collection efficiency compared to the devices made from single components. In this work we present measurements of the photovoltaic response of bulk donor-acceptor heterojunction between the conjugated polymer (as a donor, D) poly(3- octylthiophene), P3OT and fullerenes, (as acceptor, A), deposited between indium tin oxide and aluminum electrodes. These devices are based on ultrafast, reversible, metastable photoinduced electron transfer and charge separation.The quality and homogeneity of composite films as well as the choice of the substrates strongly influence the efficiency of the solar cells. One of the most important limiting factors in the performance of this present types of molecular solar cells based on interpenetrating networks of conjugated polymers and fullerene derivatives is the charge carrier transport in the active layer. This transport is driven by the electrical field provided externally by the top and bottom electrodes with different work functions. We present here efficiency and stability studies on large area (6 cm×6 cm) flexible plastic solar cells with monochromatic energy conversion efficiencyηeabout 1.4% and carrier collection efficiency nearly 20%.

scholarly journals Localized Electron Density Modulation in Conjugated Polymer Nanosheet for Boosting Photocatalytic H2 Evolution

2021 ◽  
Author(s):  
Yaoyao Liu ◽  
Haifeng Yu ◽  
Chong Shi ◽  
Zhonghua Xiang
Keyword(s):  
Electron Density ◽  
Conjugated Polymer ◽  
Reduction Reaction ◽  
H2 Evolution ◽  
Proton Reduction ◽  
Pyridine Nitrogen ◽  
Density Modulation ◽  
Photocatalytic H2 Evolution

A localized electron density modulation strategy is proposed to enhance the intrinsic surface catalytic proton reduction reaction by incorporating symmetric dual pyridine nitrogen (N) atoms into polymer skeleton. Combining with...

scholarly journals Record-high hyperpolarizabilities in conjugated polymers

2014 ◽  
Vol 2 (23) ◽  
pp. 4533-4538 ◽  
Author(s):  
Stijn Van Cleuvenbergen ◽  
Inge Asselberghs ◽  
Wouter Vanormelingen ◽  
Thierry Verbiest ◽  
Edith Franz ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
Nonlinear Optical ◽  
Optical Response ◽  
Second Order ◽  
Nonlinear Optical Response ◽  
Donor Acceptor

Disubstituted poly(phenanthrene), a conjugated polymer, unexpectedly shows a record-high second-order nonlinear optical response, in absence of donor–acceptor substitution.

Interplay of alternative conjugated pathways and steric interactions on the electronic and optical properties of donor–acceptor conjugated polymers

2014 ◽  
Vol 2 (42) ◽  
pp. 8873-8879 ◽  
Author(s):  
Igo T. Lima ◽  
Chad Risko ◽  
Saadullah G. Aziz ◽  
Demétrio A. da Silva Filho ◽  
Jean-Luc Brédas
Keyword(s):  
Optical Properties ◽  
Electronic Structure ◽  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
Electronic Structure Calculations ◽  
Polymer Backbone ◽  
Steric Interactions ◽  
Electronic And Optical Properties ◽  
Donor Acceptor ◽  
Structure Calculations

Orthogonally conjugated moieties appended to a conjugated polymer backbone are used to control solubility and packing. Here, electronic-structure calculations show how such configurations impact the polymer geometry and the electronic/optical properties.

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