Remarkable Dependence of the Final Charge Separation Efficiency on the Donor-Acceptor Interaction in Photoinduced Electron Transfer

Photoinduced electron transfer in CPP-based donor–acceptor complexes C60⊂[10]CPP and Li+@C60⊂[10]CPP was studied using DFT/TDDFT. Unusual blue shift of charge separated states for Li+@C60⊂[10]CPP complexes in the polar medium is predicted.

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Flavin Core as Electron Acceptor Component in a Zinc(II)-Phthalocyanine-Based Dyad

Australian Journal of Chemistry ◽

10.1071/ch08006 ◽

2008 ◽

Vol 61 (4) ◽

pp. 256 ◽

Cited By ~ 8

Author(s):

Andreas Gouloumis ◽

G. M. Aminur Rahman ◽

Julia Abel ◽

Gema de la Torre ◽

Purificación Vázquez ◽

...

Keyword(s):

Electron Transfer ◽

Ground State ◽

Charge Separation ◽

Photoinduced Electron Transfer ◽

Significant Interaction ◽

Transient Absorption ◽

Cross Coupling ◽

Ion Pair ◽

Donor Acceptor ◽

Recombination Dynamics

A zinc(ii)-phthalocyanine-flavin dyad has been synthesized by Heck-type cross-coupling between a flavin that bears a p-iodophenyl group and a phthalocyanine functionalized with a vinyl moiety. Electrochemical experiments reveal that no significant interaction occurs at the ground state between the two electroactive subunits. However, the occurrence of a photoinduced electron transfer in this donor–acceptor conjugate is observed in transient absorption experiments. Charge-separation (i.e., 4.0 × 1011 s–1) and charge-recombination dynamics in benzonitrile (2.2 × 1010 s–1) reveal a remarkable stabilization of the radical ion pair in this solvent.

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Charge Carrier Transfer in Ta3N5 Photoanodes Prepared by Different Methods for Solar Water Splitting

Australian Journal of Chemistry ◽

10.1071/ch15466 ◽

2016 ◽

Vol 69 (6) ◽

pp. 631 ◽

Cited By ~ 1

Author(s):

Mingxue Li ◽

Wenjun Luo ◽

Liheng Yang ◽

Xin Zhao ◽

Zhigang Zou

Keyword(s):

Electron Transfer ◽

Charge Transfer ◽

Water Splitting ◽

Charge Separation ◽

Preparation Method ◽

Separation Efficiency ◽

Interfacial Charge Transfer ◽

Splitting Property ◽

Charge Separation Efficiency ◽

Interfacial Charge

The preparation method of a photoanode can affect its water splitting property. Here, as examples, we prepared Ta3N5 photoanodes by an electrophoresis deposition (EPD) method and an oxidation and nitridation of Ta foil (ONTF) method. The light harvest, interfacial charge transfer, and charge separation of the two Ta3N5 photoanodes were analysed to gain insight into the role of the preparation method on the water splitting property. The results suggested that the ONTF-prepared Ta3N5 showed a higher solar energy conversion efficiency, arising from its better interfacial charge transfer efficiency and higher charge separation efficiency. The higher charge separation efficiency was mainly attributed to good electron transfer, and the inter-particle connectivity was key for the electron transfer in the photoanodes. Especially, the dense, small particle structure of ONTF-prepared Ta3N5 was beneficial for increasing the connectivity between inter-particles. This comparison of preparation methods can be used as a reference for future photoanode preparation to improve the water splitting property of photoelectrochemical cells.

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The progress on design and synthesis of photoactive porphyrins-based dyads, triads and polymers

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424607000357 ◽

2007 ◽

Vol 11 (05) ◽

pp. 299-312 ◽

Cited By ~ 14

Author(s):

Li Jiang ◽

Yuliang Li

Keyword(s):

Charge Separation ◽

Separation Efficiency ◽

Building Blocks ◽

Electron Donors ◽

Design And Synthesis ◽

Composite Systems ◽

Donor Acceptor ◽

Charge Separation Efficiency ◽

Artificial Photosynthetic ◽

Covalently Linked

Porphyrins are the most frequently employed building blocks as electron donors and sensitizers in artificial photosynthetic models for solar energy conversion. Recently, we have reported a series of covalently linked, donor-acceptor dyads, triads and copolymers containing porphyrin analogs aiming to improve light-harvesting capacity and charge-separation efficiency with a potential application in solar cells. In this review, we would like to summarize our recent studies on these photoactive, porphyrin-containing composite systems focusing on the designs and properties of these systems based on intermolecular electro- and energy transfer.

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REVERSIBLE, METASTABLE, ULTRAFAST PHOTOINDUCED ELECTRON TRANSFER FROM SEMICONDUCTING POLYMERS TO BUCKMINSTERFULLERENE AND IN THE CORRESPONDING DONOR/ACCEPTOR HETEROJUNCTIONS

International Journal of Modern Physics B ◽

10.1142/s0217979294000105 ◽

1994 ◽

Vol 08 (03) ◽

pp. 237-274 ◽

Cited By ~ 139

Author(s):

N. S. SARICIFTCI ◽

A. J. HEBGER

Keyword(s):

Electron Transfer ◽

Steady State ◽

Ground State ◽

Charge Separation ◽

Photoinduced Electron Transfer ◽

Semiconducting Polymers ◽

Time Resolved ◽

Degenerate Ground State ◽

Photoinduced Charge Separation ◽

Donor Acceptor

The results of comprehensive studies of photoinduced electron transfer from semiconducting (conjugated) polymers to buckminsterfullerene are reviewed. Steady state and femtosecond time-resolved photoinduced absorption (photoexcitation spectroscopy), steady state and picosecond time-resolved photoluminescence, steady state and picosecond photoconductivity, and steady state light-induced electron spin resonance measurements are summarized as experimental evidence which demonstrates ultrafast, long lived photoinduced electron transfer. Comparative studies with different semiconducting polymers as donors demonstrate that in degenerate ground state polymers, soliton excitations form before the electron transfer can occur; thereby inhibiting charge transfer and charge separation. In non-degenerate ground state systems, photoinduced electron transfer occurs in less than 10−12 s , quenching the photoluminescence as well as the intersystem crossing into the triplet manifold. The importance of electron–phonon coupling and structural relaxation following photoexcitation in these quasi-one-dimensional semiconducting polymers is proposed as a principal contribution to the stabilization of the charge separated state. Utilizing thin films of the semiconducting polymer (donor) and buckminsterfullerene (acceptor) to form a heterojunction interface, we have fabricated bilayers which functioned as photodiodes and as photovoltaic cells. The results are discussed in terms of opportunities for solar energy conversion, for photodiode detector devices, and for a variety of other applications which use photoinduced charge separation.

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Corrole–ferrocene and corrole–anthraquinone dyads: synthesis, spectroscopy and photochemistry

Physical Chemistry Chemical Physics ◽

10.1039/c5cp02565f ◽

2015 ◽

Vol 17 (40) ◽

pp. 26607-26620 ◽

Cited By ~ 17

Author(s):

Jaipal Kandhadi ◽

Venkatesh Yeduru ◽

Prakriti R. Bangal ◽

Lingamallu Giribabu

Keyword(s):

Electron Transfer ◽

Excited State ◽

Charge Separation ◽

Photoinduced Electron Transfer ◽

Charge Recombination ◽

Transfer Rates ◽

Donor Acceptor

Two different donor–acceptor systems based on corrole–ferrocene (Cor–Fc) and corrole–anthraquinone (Cor–AQ) have been designed and synthesized. Excited state properties of these dyads indicates intramolecular photoinduced electron transfer (PET) take place in these dyads and the electron-transfer rates (kET) was found to be ∼1011s−1. The charge separation (CS) and charge recombination (CR) are found to be identical.

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Fabrication of a Facet-Oriented BiVO4 Photoanode by Particle Engineering for Promotion of Charge Separation Efficiency

ACS Applied Energy Materials ◽

10.1021/acsaem.1c00694 ◽

2021 ◽

Author(s):

Boyang Zhang ◽

Yao Xiang ◽

Mei Guo ◽

Jiaming Wang ◽

Kaiwei Liu ◽

...

Keyword(s):

Charge Separation ◽

Separation Efficiency ◽

Particle Engineering ◽

Charge Separation Efficiency

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MXene-Ti3C2 assisted one-step synthesis of carbon-supported TiO2/Bi4NbO8Cl heterostructures for enhanced photocatalytic water decontamination

Nanophotonics ◽

10.1515/nanoph-2020-0088 ◽

2020 ◽

Vol 9 (7) ◽

pp. 2077-2088 ◽

Cited By ~ 2

Author(s):

Daixun Jiang ◽

Xun Sun ◽

Xilu Wu ◽

Shuai Zhang ◽

Xiaofei Qu ◽

...

Keyword(s):

Charge Separation ◽

Photocatalytic Performance ◽

Separation Efficiency ◽

Salt Flux ◽

The Novel ◽

Water Contaminants ◽

Photocatalytic Removal ◽

One Step ◽

Charge Separation Efficiency ◽

Perovskite Type

AbstractThe strategy to improve the photocatalytic removal efficiencies towards organic pollutants is still a challenge for the novel Sillen–Aurivillius perovskite type Bi4NbO8Cl. Herein, we report carbon-supported TiO2/Bi4NbO8Cl (C-TiO2/Bi4NbO8Cl) heterostructures with enhanced charge separation efficiency, which were fabricated via molten-salt flux process. The carbon-supported TiO2 particles were derived from MXene Ti3C2 precursors, and attached on plate-like Bi4NbO8Cl, acting as electron-traps to achieve supressed recombination of photo-induced charges. The improved charge separation confers C-TiO2/Bi4NbO8Cl heterostructures superior photocatalytic performance with 53% higher than pristine Bi4NbO8Cl, towards rhodamine B removal with the help of photo-induced holes. Moreover, the C-TiO2/Bi4NbO8Cl heterostructures can be expanded to deal with other water contaminants, such as methyl orange, ciprofloxacin and 2,4-dichlorophenol with 44, 25 and 13% promotion, respectively, and thus the study offers a series of efficient photocatalysts for water purification.

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