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Brian N DiMarco, Ludovic Troian-Gautier, Renato N Sampaio, Gerald J Meyer
Two sensitizers, [Ru(bpy)2 (dcb)]2+ ( RuC ) and [Ru(bpy)2 (dpb)]2+ ( RuP ), where bpy is 2,2'-bipyridine, dcb is 4,4'-dicarboxylic acid-2,2'-bipyridine and dpb is 4,4'-diphosphonic acid-2,2'-bipyridine, were anchored to mesoporous TiO2 thin films and utilized to sensitize the reaction of TiO2 electrons with oxidized triphenylamines, TiO2 (e- ) + TPA+ → TiO2 + TPA, to visible light in CH3 CN electrolytes. A family of four symmetrically substituted triphenylamines (TPAs) with formal Eo (TPA+/0 ) reduction potentials that spanned a 0...
January 28, 2018: Chemical Science
Vishwesh Venkatraman, Rajesh Raju, Solon P Oikonomopoulos, Bjørn K Alsberg
BACKGROUND: Dye-sensitized solar cells (DSSCs) have garnered a lot of attention in recent years. The solar energy to power conversion efficiency of a DSSC is influenced by various components of the cell such as the dye, electrolyte, electrodes and additives among others leading to varying experimental configurations. A large number of metal-based and metal-free dye sensitizers have now been reported and tools using such data to indicate new directions for design and development are on the rise...
April 3, 2018: Journal of Cheminformatics
Huiyun Jiang, Yongzhen Wu, Ashraful Islam, Min Wu, Weiwei Zhang, Chao Shen, Hao Zhang, Erpeng Li, He Tian, Wei-Hong Zhu
The continuous efforts of constructing novel D-A-π-A structured organic sensitizers with excellent optoelectronic properties have resulted in substantial improvement of power conversion efficiency (PCE) as well as stability of dye-sensitized solar cells (DSSCs). Here, we report a new molecular engineering strategy for enhancing optical gain and improving excited state features in D-A-π-A structured organic sensitizers by improving conjugation size and rigidity of the auxiliary acceptor functional group. A series of phenanthrene-fused-quinoxaline (PFQ) based D-A-π-A organic sensitizers (WS-82, WS-83 and WS-84) are designed and synthesized for application in DSSCs...
April 3, 2018: ACS Applied Materials & Interfaces
Yang Liu, Bryan R Wygant, Oluwaniyi Mabayoje, Jie Lin, Kenta Kawashima, Jun-Hyuk Kim, Wenzhang Li, Jie Li, C Buddie Mullins
During photoelectrochemical (PEC) water splitting, the reactions occur on the surface of the photoelectrode. Therefore, the properties of the interfaces between the various components of the electrode (semiconductor/semiconductor, semiconductor/catalyst, or photoelectrode/electrolyte) affect the PEC performance of the composite material. Notably, surface trap states may hinder charge transfer and transport properties, and also cause Fermi pinning, affecting the quasi-Fermi level and onset potential under illumination, which may in turn influence the PEC performance of the corresponding tandem cells...
April 2, 2018: ACS Applied Materials & Interfaces
Michael D Wisser, Stefan Fischer, Chris Siefe, A Paul Alivisatos, Alberto Salleo, Jennifer A Dionne
We demonstrate a facile method to improve upconversion quantum yields in Yb,Er-based nanoparticles via emission dye-sensitization. Using the commercially available dye ATTO 542, chosen for its high radiative rate and significant spectral overlap with the green emission of Er3+ , we decorate the surfaces of sub-25 nm hexagonal-phase Na(Y/Gd/Lu)0.8 F4 :Yb0.18 Er0.02 upconverting nanoparticles with varying dye concentrations. Upconversion photoluminescence and absorption spectroscopy provide experimental confirmation of energy transfer to and emission from the dye molecules...
March 29, 2018: Nano Letters
Lei Tian, Jens Föhlinger, Zhibin Zhang, Palas Baran Pati, Junzhong Lin, Tomas Kubart, Yong Hua, Junliang Sun, Lars Kloo, Gerrit Boschloo, Leif Hammarström, Haining Tian
Solid state p-type dye sensitized NiO-dye-TiO2 core-shell solar cells with an organic dye PB6 were successfully fabricated for the first time. With Al2O3 as an inner barrier layer, the recombination process between injected holes in NiO and injected electrons in TiO2 was significantly suppressed and the charge transport time was also improved.
March 28, 2018: Chemical Communications: Chem Comm
Fan Wang, Liming Sun, Yanan Li, Wenwen Zhan, Xiaojun Wang, Xiguang Han
The high activity of exposed facets and large surface area have significant effects on the performance of photocatalysts because most of the photoreactivity properties of materials are related to surface processes. The strategy of combining high-index facets and a hollow structure into one material will provide a new way for designing effective photocatalysts, possessing active exposed facets and a large surface area at the same time. However, fabricating one material with both high-index facets and a hollow structure is still a great challenge due to their thermodynamic instability...
March 27, 2018: Inorganic Chemistry
P S Chandrasekhar, Piyush K Parashar, Sanjay Kumar Swami, Viresh Dutta, Vamsi K Komarala
The role of the surface plasmon resonance (SPR) of gold nanorods (Au NRs) on the performance of Y123 dye-sensitized solar cells (DSSC) was investigated. DSSCs were fabricated by incorporating different concentrations (0.6 to 3.0 wt%) of Au NRs into TiO2 photoanodes. With an increase in the concentration of the Au NRs, the light absorption by the Y123 dye loaded photoanodes enhanced linearly, but the charge extraction was susceptible to the concentration of the Au NRs. With optimized concentrations (∼1.8 wt%) of the Au NRs, the photocurrent of the DSSC enhanced from 12...
March 27, 2018: Physical Chemistry Chemical Physics: PCCP
Ju Qiu, Dayong He, Rui Zhao, Bolun Sun, He Ji, Nan Zhang, Yanzi Li, Xiaofeng Lu, Ce Wang
Platinum is the most commonly used dye-sensitized solar cell (DSSC) counter electrode (CE) due to its superior electrocatalytic activity and high transparency. However, the scarcity and high-cost of Pt restrict its practical application for the large-scale production of DSSCs. Herein, a facile approach for fabricating highly dispersed Co9 S8 nanoparticles with small diameters in the range of 5-10 nm on the surface of carbon nanofibers (CNFs) via an electrospinning followed by calcination and hydrothermal reaction was developed...
March 14, 2018: Journal of Colloid and Interface Science
Yuki Haishima, Yasuhiro Kubota, Kazuhiro Manseki, Jiye Jin, Yoshiharu Sawada, Toshiyasu Inuzuka, Kazumasa Funabiki, Masaki Matsui
Near-infrared (NIR) absorbing squaraine dyes SQ1-SQ7 having benz[c,d]indolenine as a donor moiety were designed and synthesized for application in dye-sensitized solar cells. The synthesized squaraine dyes showed absorption maxima in the range of 771-820 nm in ethanol. Annulation of the benzene ring to an indolenine-based anchor moiety led to a red-shifted and broadened absorption band on TiO2 film, and to HOMO to LUMO+1 intramolecular charge transfer transition properties suitable for electron injection from a photoexcited dye molecule to the TiO2 conduction band...
March 26, 2018: Journal of Organic Chemistry
Kassio P S Zanoni, Ronaldo C Amaral, Neyde Y Murakami Iha, Felipe D Abreu, Idalina M M de Carvalho
A versatile Ru(II) complex bearing an anthracene moiety was synthesized in our search for suitable compounds towards efficient molecular devices. The new engineered dye, cis‑[Ru(dcbH2 )(NCS)2 (mbpy‑anth)] (dcbH2 =2,2'‑bipyridyl‑4,4'‑dicarboxylic acid, mbpy‑anth=4‑[N‑(2‑anthryl)carbamoyl]‑4'‑methyl‑2,2'‑bipyridine), exhibits a blueish emission in a vibronically structured spectrum ascribed to the fluorescence of a1 LCAnth (ligand centered) excited state in the anthracene and has a potential to be exploited in the fields of smart lighting and displays...
March 10, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Junting Wang, Xinrui Xie, Guorong Weng, Yi Yuan, Jing Zhang, Peng Wang
Maintaining both a high external quantum efficiency and a large open-circuit photovoltage of dye-sensitized solar cells (DSSCs) is a crucial challenge in the process of developing narrow-energy-gap dyes for the capture of infrared solar photons. Herein, we report two donor-acceptor organic dyes, C294 and C295, with a polycyclic heteroaromatic unit, 6,11-dihydrothieno[3',2':8,9]chryseno[10,11,12,1-bcdefg]carbazole (TCC), as the central module of the electron donor, and ethylbenzothiadiazole-benzioc acid as the electron acceptor...
March 23, 2018: ChemSusChem
Hui Ma, Wei Ma, Jian-Fu Chen, Xiao-Yuan Liu, Yue-Yi Peng, Zhe-Yao Yang, He Tian, Yi-Tao Long
Quantifying the photoinduced electron transfer properties of a single entity is of paramount importance for clarifying the link between the photoelectrochemical performance and the specific properties of an individual. Here, we successfully monitored the photoelectrochemical behavior of a single dye-sensitized ZnO entity on a Au ultramicroelectrode with different TiO2 film thicknesses. Due to a trap-limited electron diffusion in TiO2 film, a sub-millisecond photocurrent transient was observed for an individual N719@ZnO associated with single-particle photocatalytic water splitting...
April 4, 2018: Journal of the American Chemical Society
Lei Yang, Rebecka Lindblad, Erik Gabrielsson, Gerrit Boschloo, Håkan Rensmo, Licheng Sun, Anders Hagfeldt, Tomas Edvinsson, Erik M J Johansson
4-tert-butylpyridine (t-BP) is commonly used in solid state dye-sensitized solar cells (ssDSSCs) to increase the photo-voltaic performance. In this report, the mechanism how t-BP functions as a favorable additive is investigated compre-hensively. ssDSSCs were prepared with different concentration of t-BP and a clear increase in efficiency was observed up to a maximum concentration and for higher concentrations the efficiency thereafter decreases. The energy level alignment in the complete devices was measured using hard X-ray photoelectron spectroscopy (HAXPES)...
March 21, 2018: ACS Applied Materials & Interfaces
Yue-Ying Li, Jian-Gan Wang, Huanhuan Sun, Bingqing Wei
Organic dyes used in the conventional dye-sensitized solar cells (DSSCs) suffer from poor light stability and high cost. In this work, we demonstrate a new inorganic sensitized solar cell based on ordered one-dimensional (1D) semiconductor nanorod arrays of TiO2/NiTiO3 heterostructures prepared via a facile two-step hydrothermal approach. The semiconductor heterostructure arrays are highly desirable and promising for DSSCs due to their direct charge transport capability and slow charge recombination rate. The low-cost NiTiO3 inorganic semiconductor possesses an appropriate band gap that matches well with TiO2, which behaviors like a "dye" to enable efficient light-harvesting and fast electron-hole separation...
March 20, 2018: ACS Applied Materials & Interfaces
B A Hussein, J T Huynh, P L Prieto, C P Barran, A E Arnold, O V Sarycheva, A J Lough, B D Koivisto
BODIPY (4,4-difluoro-4-bora-3a,4a-diaza-s-indacenes) dyes possess intense absorption profiles that can be exploited in various light harvesting applications. However, redox stability and optimization of frontier molecular orbital energies in these dyes are critical for their successful incorporation into new solar cell materials. This article describes the synthesis and characterization of a family of β-substituted BODIPY-ferrocene dyads with push-pull architectures. Designed to stabilize the photo-oxidized BODIPY for dye-sensitized solar cell (DSSC) applications, some deleterious electron transfer behaviours emerged when the ferrocene unit was conjugated to electron deficient BODIPYs...
March 16, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Shoushuang Huang, Haitao Wang, Shangdai Wang, Zhangjun Hu, Ling Zhou, Zhiwen Chen, Yong Jiang, Xuefeng Qian
Designing low-cost electrocatalysts combining the features of outstanding catalytic activity, excellent electrical conductivity, and high chemical stability remains a critical challenge for the large-scale fabrication of dye-sensitized solar cells (DSSCs). Here we report the controlled synthesis of CoS2 -CoSe2 heterostructured nanocrystals encapsulated in N-doped carbon hollow nanocubes (CoS2 -CoSe2 @NC) through simultaneous sulfurization and selenization of polydopamine coated Prussian blue analogs. Benefiting from both structural and compositional characteristics, namely, the synergistic effect of CoS2 -CoSe2 heterojunctions, the conductive N-doped carbon coating and the porous structure of the nanocubes, the resultant CoS2 -CoSe2 @NC nanocubes exhibit excellent electrocatalytic activity and cycling stability toward the generation of I3 - ions in DSSCs...
March 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
S Suresh, Gautam E Unni, M Satyanarayana, A Sreekumaran Nair, V P Mahadevan Pillai
Engineering photons on a nanoscale via guidance and localization by metal nanostructures has a profound influence on the performance of devices that try to mimic the process of photosynthesis. The conventional route for the synthesis of plasmonic nanoparticles and their integration into the porous structure of the photoanode either directly or after being capped with a dielectric material not only adds to the complexity but also to the cost of the cell. The present study introduces the concept of a plasmonic blocking layer that concurrently acts as a light harvester and an electron-blocking layer in a dye-sensitized solar cell (DSSC), wherein the plasmonic silver nanoparticles are incorporated into an Nb2 O5 blocking layer by a simple one-step process...
March 14, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Roberta R Rodrigues, Jared Heath Delcamp, Hammad Cheema
The development of high voltage solar cells is an attractive way to use sunlight for solar-to-fuel devices, multijunction solar-to-electric systems, and to power limited area consumer electronics. By designing a low oxidation potential organic dye (RR9)/redox shuttle (Fe(bpy)33+/2+) pair for dye-sensitized solar cell (DSC) devices, the highest single device photovoltage (1.42 V) has been realized for a DSC not relying on doped TiO2. Additionally, Fe(bpy)33+/2+ offers a robust, readily tunable ligand platform for redox potential tuning...
March 12, 2018: Angewandte Chemie
Wenzhuo Wu, Cong Wei, Xiangcheng Lin, Qun Xu
As a promising non-precious metal photoelectrochemical (PEC) catalyst, MoS2 exhibits high electrocatalytic activity and stability, while the weak light absorption efficiency and low photoresponse current limit its practical application. Herein, a facile coassembly approach was proposed to construct the porphyrin-MoS2 composite photoelectrocatalysts. The as-prepared photoelectro-catalysts show significantly enhanced photocurrent response as high as 16 μA cm-2, which is about 2 times higher than that of bare MoS2...
March 12, 2018: Chemistry, An Asian Journal
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