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Pengtao Xu, Tian Huang, Jianbin Huang, Yun Yan, Thomas E Mallouk
Water oxidation has long been a challenge in artificial photosynthetic devices that convert solar energy into fuels. Water-splitting dye-sensitized photoelectrochemical cells (WS-DSPECs) provide a modular approach for integrating light-harvesting molecules with water-oxidation catalysts on metal-oxide electrodes. Despite recent progress in improving the efficiency of these devices by introducing good molecular water-oxidation catalysts, WS-DSPECs have poor stability, owing to the oxidation of molecular components at very positive electrode potentials...
June 18, 2018: Proceedings of the National Academy of Sciences of the United States of America
Zinab H Bakr, Qamar Wali, Jamil Ismail, Naveen Kumar Elumalai, Ashraf Uddin, Rajan Jose
In this data article, we provide energy dispersive X-ray spectroscopy (EDX) spectra of the electrospun composite (SnO2 -TiO2 ) nanowires with the elemental values measured in atomic and weight%. The linear sweep voltammetry data of composite and its component nanofibers are provided. The data collected in this article is directly related to our research article "Synergistic combination of electronic and electrical properties of SnO2 and TiO2 in a single SnO2 -TiO2 composite nanowire for dye-sensitized solar cells" [1]...
June 2018: Data in Brief
Yogesh S Tingare, Suri Babu Akula, Ming-Tai Shen, Chaochin Su, Shih-Yu Ho, Sheng-Han Tsai, Ya-Fen Lin, Wen-Ren Li
New heteroleptic Ru(ii) complexes consisting of pyridylimine as an ancillary ligand were synthesized and characterized for applications in dye sensitized solar cells. Complexes with cis and trans configurations around the central ruthenium metal were obtained using simple synthetic protocols by varying the substituents on the pyridylimine ligands. The geometries of these complexes were confirmed by single crystal X-ray analysis. The effect of the difference in the configurations of these complexes on their device performances was studied and the sensitizer with a trans arrangement around the metal showed a higher overall conversion efficiency (η) of 7...
June 13, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
McKenzie Raber, Matthew David Brady, Ludovic Troian-Gautier, John Dickenson, Seth L Marquard, Jacob Hyde, Santiago Lopez, Gerald J Meyer, Thomas J Meyer, Daniel P Harrison
A series of 18 ruthenium(II) polypyridyl complexes were synthesized and evaluated under electrochemically oxidative conditions, which generates the Ru(III) oxidation state and mimics the harsh conditions experienced during the kinetically-limited regime that can occur in dye-sensitized solar cells (DSSCs) and dye-sensitized photoelectrosynthesis cells (DSPECs), to further develop fundamental insights into the factors governing molecular sensitizer surface stability in aqueous 0.1 M HClO4 (aq). Both desorption and oxidatively induced ligand substitution were observed on planar fluorine doped tin oxide, FTO, electrodes, with a dependence on the E1/2 Ru(III/II) redox potential dictating the comparative ratios of the processes...
June 8, 2018: ACS Applied Materials & Interfaces
Kunio Shimada
In contrast to ordinary solid-state solar cells, a flexible, elastic, extensible and light-weight solar cell has the potential to be extremely useful in many new engineering applications, such as in the field of robotics. Therefore, we propose a new type of artificial skin for humanoid robots with hybrid functions, which we have termed hybrid skin (H-Skin). To realize the fabrication of such a solar cell, we have continued to utilize the principles of ordinary solid-state wet-type or dye-sensitized solar rubber as a follow-up study to the first report...
June 6, 2018: Sensors
Shuang Lu, Huanying Yang, Fei Li, Yinglin Wang, Shixin Chen, Guochun Yang, Yichun Liu, Xintong Zhang
Development of cost-effective counter electrode (CE) materials is a key issue for practical applications of photoelectrochemical solar energy conversion. Kesterite Cu2 ZnSnS4 (CZTS) has been recognized as a potential CE material, but its electrocatalytic activity is still insufficient for the recovery of I- /I3 - electrolyte in dye-sensitized solar cells (DSSCs). Herein, we attempt to enhance the electrocatalytic activity of kesterite CZTS through element substitution of Zn2+ by Co2+ and Ni2+ cations, considering their high catalytic activity, as well as their similar atomic radius and electron configuration with Zn2+ ...
June 7, 2018: Scientific Reports
Venkatanarasimha Rao Chelli, Animes Kumar Golder
The analytes such as ascorbic acid (AA) present in Sechium edule were extracted (294 mg AA kg-1 fruit) in an aqueous media for its potential application for Ag-doping onto wurtzite ZnO. The bandgap of ZnO was decreased to 2.85 eV at the optimal Ag-loading of 1.18% (w/w) against 3.13 eV for the control catalyst without using the analytes and, the commercial AA only could reduce the bandgap to 2.91 eV. The saturation photo-electrochemical current density (46.68 mA cm-2 ) at Eanode  ≥ 0.31 V vs...
May 28, 2018: Chemosphere
Andreas Kunzmann, Marco Gruber, Ruben Casillas, Johannes Zirzlmeier, Melanie Stanzel, Wolfgang Peukert, Rik Tykwinski, Dirk Michael Guldi
A novel pentacene dimer (P2), and a structurally analogous monomer (P1), bearing a carboxylic acid were designed and synthesized for use in n-type dye-sensitized solar cells (DSSC). In P2, the triplet excited states that are formed via the rapid, spin-allowed process singlet fission (SF) were expected to enable carrier multiplication in comparison to the slow, spin-forbidden intersystem crossing (ISC) seen in P1. We opted for meta-positioning of the two pentacenes and the carboxylate anchor in P2 to balance the intramolecular dynamics of singlet fission and electron injection...
June 4, 2018: Angewandte Chemie
William Ghann, Hyeonggon Kang, Jamal Uddin, Sunalee J Gonawala, Sheikh Mahatabuddin, Meser M Ali
Dye sensitized solar cells were fabricated with DyLight680 (DL680) dye and its corresponding europium conjugated dendrimer, DL680-Eu-G5PAMAM, to study the effect of europium on the current and voltage characteristics of the DL680 dye sensitized solar cell. The dye samples were characterized by using Absorption Spectroscopy, Emission Spectroscopy, Fluorescence lifetime and Fourier Transform Infrared measurements. Transmission electron microscopy imaging was carried out on the DL680-Eu-G5PAMAM dye and DL680-Eu-G5PAMAM dye sensitized titanium dioxide nanoparticles to analyze the size of the dye molecules and examine the interaction of the dye with titanium dioxide nanoparticles...
2018: Journal of Nanomedicine & Nanotechnology
Kaijing Song, Chuanmin Ding, Bing Zhang, Honghong Chang, Zhihuan Zhao, Wenlong Wei, Junwen Wang
The authors describe a dye-sensitized photoelectrochemical immunoassay for the tumor marker carcinoembryonic antigen (CEA). The method employs the rhodamine dye Rh123 with red color and absorption maximum at 500 nm for spectral sensitization, and a 3D nanocomposite prepared from graphene oxide and MoS2 acting as the photoelectric conversion layer. The nanocomposite with flower-like 3D architectures was characterized by transmission electron microscopy, scanning electron microscopy, X-ray powder diffraction, and UV-vis diffuse reflectometry...
June 1, 2018: Mikrochimica Acta
Christopher D Windle, Julien Massin, Murielle Chavarot-Kerlidou, Vincent Artero
A protocol that combines gas chromatography and a high-sensitivity micro Clark-type electrode is described to quantify hydrogen production across gas and solution phases for systems operating at very low currents such as dye-sensitized H2-evolving photocathodes. Data indicate that a significant fraction of H2 remains in aqueous solution even after several hours of experiments. Using this protocol, re-evaluation of a dye-sensitized H2-evolving photocathode based on a dye-catalyst dyad showed a reproducible 66% increase of the faradaic efficiency compared with previously reported headspace GC measurements [Kaeffer et al...
May 30, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Jin-Le Hou, Peng Huo, Zheng-Zhen Tang, Li-Na Cui, Qin-Yu Zhu, Jie Dai
The use of multiple sensitizers in dye sensitized solar cells has been attractive as a promising way to achieve highly efficient photovoltaic performance. However, except for the complementary absorption, synergistic effects among the dye components have not been well understood. Herein, using ferrocene-1-carboxylate (FcCO2 ) and catechol (Cat) as dye ligands, two titanium oxo clusters (TOCs), [Ti3 O(Oi Pr)6 (Cat)(FcCO2 )2 ] (1) and [Ti7 O4 (Oi Pr)8 (Cat)5 (FcCO2 )2 ] (2), were synthesized and structurally characterized...
May 24, 2018: Inorganic Chemistry
Li Ren, Huan Cong
A decarboxylative alkylation of benzylic C(sp3 )-H bonds of N-aryl tetrahydroisoquinolines under the irradiation of blue light is reported, featuring a broad substrate scope, low cost, heavy-metal-free, and mild conditions. A preliminary mechanistic study indicated that radical intermediates are involved during the course of the reaction.
May 21, 2018: Organic Letters
Lege Wang, Zijian Yang, You-Fen Li, Ru Yang, Zhigang Dai, Shuqiao Hu, Liangliang Sun, Yaoyao Tong
CaF2 : Eu2+ , Tb3+ introduced into dye-sensitized solar cells (DSSCs) were studied to examine the influence of luminescent materials on photoanodes using a simple method. The emission spectra of CaF2 : Eu2+ , Tb3+ included the blue light of Eu2+ (4f → 5d) at 430 nm and green emission of Tb3+ (5 D4  → 7 F5 ) at 542 nm under the monitoring wavelengths at 398 nm, which matched well the absorption range of the N719 dye in DSSCs. Energy transfer (ET) was verified between Eu2+ and Tb3+ ions and the efficiency of ET found to increase with Tb3+ concentration...
May 4, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
V S Manikandan, Akshaya K Palai, Smita Mohanty, Sanjay K Nayak
In the current investigation, TiO2 and TiO2 -ZnO (core-shell) spherical nanoparticles were synthesized by simple combined hydrolysis and refluxing method. A TiO2 core nanomaterial on the shell material of ZnO was synthesized by utilizing variable ratios of ZnO. The structural characterization of TiO2 -ZnO core/shell nanoparticles were done by XRD analysis. The spherical structured morphology of the TiO2 -ZnO has been confirmed through field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) studies...
May 3, 2018: Journal of Photochemistry and Photobiology. B, Biology
Jixin Yao, Kang Zhang, Wen Wang, Xueqin Zuo, Qun Yang, Huaibao Tang, Mingzai Wu, Guang Li
The porous structure and excellent specific surface area are superior for use as a counter electrode (CE) material. In addition, N-doped graphene possesses a remarkable electron-transfer pathway and many active sites. Therefore, a novel idea is to wrap uniform flower-like mesoporous Fe3O4 (Fe3O4UFM) in a N-doped graphene (N-RGO) network structure to enhance the power conversion efficiency (PCE). The hybrid materials of Fe3O4UFM@N-RGO are first used as a CE in dye-sensitized solar cells (DSSCs), showing a preeminent conductive interconnected 3D porous structure with more catalytic activity sites and a better ability for and a faster reaction rate of charge transfer, resulting in quicker reduction of I_3^- than Pt...
May 18, 2018: ACS Applied Materials & Interfaces
Wan-Chin Yu, Neethu Sabastian, Wei-Chen Chang, Chi-Yang Tsia, Chun-Min Lin
Mesoporous ZnO films composed of interconnected porous nanoplates were prepared by an electrochemical deposition-pyrolytic conversion approach and constructed into the photoanodes of dyesensitized solar cells (DSSCs). Precursor nanoplates grown on conducting glass substrates were transformed into ZnO porous nanoplates by calcination at 400 °C for 1 h. Correlations between the ZnO film thickness and the electrochemical deposition time were determined in order to prepare ZnO films of various thicknesses and to study the effect of the film thickness on the photovoltaic performance of DSSCs...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Eduardo Schiavo, Camille Latouche, Vincenzo Barone, Orlando Crescenzi, Ana B Muñoz-García, Michele Pavone
CuMO2 delafossites (M = Al, Ga, and Cr) are p-type semiconductor oxides that have been recently proposed as the electrode in p-type dye-sensitized solar cells (p-DSSC) which is an alternative to the standard, low-performing nickel oxide. To assess this potential application of delafossites, we report here a DFT-based investigation of the structural and electronic properties of CuAlO2, CuGaO2 and CuCrO2. In particular, we address the role of Mg doping to obtain the p-type semiconducting character: the substitution of an M3+ cation with Mg2+ is easier with Ga than with Al and Cr, and, in all cases, the hole introduced by Mg2+ leads to the formation of Cu2+ species...
May 11, 2018: Physical Chemistry Chemical Physics: PCCP
Elin Sundin, Maria Abrahamsson
Solar energy has the potential of providing the world with clean and storable energy. In principle, solar fuels can be generated by light absorption followed by primary charge separation and secondary charge separation to reaction centres. However this comes with several challenges, including the need for long-lived charge separation and accumulation of several charges. This Feature Article focuses on how to achieve long-lived charge separation in dye sensitized semiconductor assemblies and the way towards multi-electron transfer through conduction band mediation, aiming at solar fuel generation...
May 8, 2018: Chemical Communications: Chem Comm
Yung-Kang Peng, Hung-Lung Chou, Shik Chi Edman Tsang
As the chemical state of titanium on the surface of TiO2 can be tuned by varying its host facet and surface adsorbate, improved performance has been achieved in fields such as heterogeneous (photo)catalysis, lithium batteries, dye-sensitized solar cells, etc. However, at present, no acceptable surface technique can provide information about the chemical state and distribution of surface cations among facets, making it difficult to unambiguously correlate facet-dependent properties. Even though X-ray photoelectron spectroscopy (XPS) is regarded as a sensitive surface technique, it collects data from the top few layers of the sample, instead of a specific facet, and hence fails to distinguish small changes in the chemical state of Ti imposed by adsorbates on a facet...
March 7, 2018: Chemical Science
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