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Novel cobalt redox materials admitted in natrosol polymer with a thiophene based additive as a gel polymer electrolyte to tune up the efficiency of dye sensitized solar cells
摘要： Synthesis of novel cobalt redox pairs such as Co2+/3+[bnbip]2, Co2+/3+[npbi]3, Co2+/3+[b(ttb)bip]2 and unknown organic additive integrated into a new natrosol polymer host act as an polymer gel electrolytes in DSSC. The newly synthesized ligands and organic additive (BNBIT) was characterized by 1H, 13C NMR and HRMS spectroscopy and complexes were confirmed by UV-Visible, FTIR and ESI-MS spectrum. Electrochemical analysis was determined for all new redox pairs in that Co2+/3+[bnbip]2 shows positive E1/2value 0.51 V Vs NHE and higher formal potential 0.55 V which leads a way to increase in open circuit voltage of DSSC. The new natrosol polymer gel electrolytes was characterized by using UV-Visible, FTIR, DSC, XRD, impedance spectrum and I-V curve. The conductivity increases up to 7.14x10-4Scm-1 for natrosol polymer gel electrolyte with a novel organic additive and stable Co2+/3+[bnbip]2 redox pair. The new organic additive plays a vital role in DSSC device which shields the Co3+ ions of the redox pair in gel electrolytes and interaction with TiO2 surface that made shift in quasi Fermi level of TiO2 which suppresses the recombination processes. The new natrosol polymer gel electrolytes with novel cobalt redox pairs and thiophene based organic additive that enhances the efficiency up to 4.5% under light illumination of 100mW/cm2 with a better stability. A increase in photocurrent due to BNBIT organic additive and the best E1/2 value of Co2+/3+[bnbip]2 mediator which made shift in (EF,n) quasi Fermi level of TiO2 that mitigate the recombination process in DSSCs. The interfacial studies in DSSCs were focused via EIS to elucidate the charge transport mechanisms at the interfaces of photoelectrodes and electrolyte medium of the devices.
关键词： quasi Fermi level.,organic additive,Dye sensitized solar cells,HEC polymer gel electrolyte,novel cobalt redox pairs
更新于2025-09-11 14:15:04
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Controlled synthesis of porous nanosheets-assembled peony-like cobalt nickel selenides for triiodide reduction in dye-sensitized solar cells
摘要： Developing counter electrode (CE) materials with outstanding catalytic performance and low cost is a critical step for the large-scale application of dye-sensitized solar cells (DSSCs). In this work, a facile bottom-up solvothermal route followed by a selenization process was introduced to synthesize the hierarchical cobalt nickel selenides nanoflowers (CoeNieSe NFs) consisted of numerous cross-linked porous nanosheets. The structure and composition of CoeNieSe NFs could be regulated by simply tuning the feed molar ratio of Ni/Co. Pro?ting from the well structural nature, relatively large surface area, appropriate porosity, optimized crystal structure and the synergy of multiple components, CoeNieSe NFs display superior catalytic activity toward the triiodide reduction. Impressively, the power conversion ef?ciency (PCE) of DSSC assembled with CoeNieSe-1:1 NFs CE is 9.00%, which outperforms that of Pt CE (7.97%). This strategy sheds a new light on the controlled synthesis of advanced hierarchical materials for the application in the ?eld of sustainable energy.
关键词： Dye-sensitized solar cells,Counter electrode,Cobalt nickel selenides,Triiodide reduction,Peony-like structure
更新于2025-09-11 14:15:04
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Triple-Shelled Co-VSex Hollow Nanocages as Superior Bifunctional Electrode Materials for Efficient Pt-Free Dye-Sensitized Solar Cells and Hydrogen Evolution Reactions
摘要： Complex nanostructures with distinct spatial architectures and more active sites hold broad prospects in new energy conversion fields. Herein, a facile strategy was carried out to construct triple-shelled Co-VSex nanocages, starting via an ion-exchange process about Co-based zeolitic imidazolate framework-67 (ZIF-67) nanopolyhedrons and VO3?, followed by the formation of triple-shelled Co-VSex hollow nanocages during the process of rising the solvothermal temperature under the assistance of SeO32?. Meanwhile, triple-shelled Co-VSx and yolk-double shell Co-VOx nanocages were fabricated as references by a similar process. Benefiting from the larger surface areas and more electrolyte adsorption sites, the triple-shelled Co-VSex nanocages exhibited excellent electrocatalytic performances when applied as the electrochemical catalysts for dye-sensitized solar cell (DSSC) and hydrogen evolution reaction (HER). More concretely, the DSSC based on Co-VSex counter electrode (CE) showed outstanding power conversion efficiency of 9.68% when Pt counterpart was 8.46%. Moreover, Co-VSex electrocatalyst exhibited prominent HER performance with a low onset overpotential of 40 mV and a small Tafel slope of 39.1 mV dec?1 in acid solution.
关键词： Dye-sensitized solar cells,Hydrogen evolution reactions,Pt-free catalysts,Triple-shelled nanocages,Co-VSex,Bifunctional electrocatalysts
更新于2025-09-11 14:15:04
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Novel indeno[1,2-b]indole-spirofluorene donor block for efficient sensitizers in dye-sensitized solar cells
摘要： Indeno[1,2-b]indole-spirofluorene (IISF) unit has been synthesized and firstly applied as a donor candidate for the sensitizer of dye-sensitized solar cells. Two new dyes JY57 and JY58, based on IISF donor, are consequently constructed, together with dithieno[3,2-b:2',3'-d]pyrrole (DTP) as π-bridge and cyanoacrylic acid as acceptor. For JY58, additional electron-withdrawing 2,1,3-benzothiadiazole unit is inserted between IISF donor and DTP π-bridge to achieve a broader absorption range. Both dyes show high JSC and good device performance in iodine electrolyte. The photovoltaic properties are further tuned by co-adsorption and co-sensitization strategies, and better PCEs are obtained. Among the series of cells under AM 1.5G irradiation, cells fabricated by the synergic adsorption of JY57, chenodeoxycholic acid and JY59, achieve the highest PCE of 9.56%, which is much higher than 8.46% for N719 at the same condition.
关键词： Metal-free organic sensitizers,Synergy of co-sensitization and co-adsorption,Dye sensitized solar cells,Indeno[1,2-b]indole-spirofluorene donor
更新于2025-09-11 14:15:04
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Carbon Dots as Cosensitizers in Dye-Sensitized Solar Cells and Fluorescence Chemosensors for 2,4,6-Trinitrophenol Detection
摘要： Carbon dots (CDs) are a unique class of fluorescent nanomaterials, whose emissions can be tuned by manipulating the reaction conditions of their formation. Herein, we report a facile solvothermal route for producing CDs with tunable properties by employing N,N-dimethylformamide (DMF) as the solvent medium. Using completely green carbon sources, two types of CDs are synthesized: citric acid produces green emitting CDs (G-CDs) while gallic acid produces blue emitting CDs (B-CDs). The optical analysis of the G-CDs suggests their application as co-sensitizers along with N719 dye in dye sensitized solar cells (DSSCs). Following this, the effect of G-CDs in DSSCs was studied and a photo-conversion efficiency of 6.9% was extracted from the device. Meanwhile, the B-CDs produced from gallic acid are hydrophobic in nature and their blue colored emission is quenched in the vicinity of TNP in less than 1 min with a limit of detection of 0.75 μM.
关键词： Carbon dots,Fluorescence chemosensor,Dye sensitized solar cells,2,4,6-Trinitrophenol detection
更新于2025-09-11 14:15:04
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Natural dyes extracted from leaves, fruits, and roots of <i>Piper Betel, Adonidia Merrillii</i> and <i>Morinda Citrifolia</i> as photosynthesizers for dye sensitized solar cells
摘要： In this study, the fabrication of dye sensitized solar cell (DSSCs) using the leaves of Piper Betel (PB), fruits of Adonidia Merrillii (AM) and roots of Morinda Citrifolia (MC) and combination of these three dyes (PB/AM/MC) had been conducted. Fabrication of the DSSCs was conducted using layered system, which involved sandwiching of a working electrode (TiO2 semiconductor) and counter electrode (platinum paste) The chemical and electrochemical characteristic of natural dye extracts were determined using pH meter, Fourier transform infrared (FT-IR) spectroscopy and ultra violet (UV-Vis) spectroscopy. From the study, it was observed that PB dyes showed the highest efficiencies (0.0712 %) followed by the combination dyes (0.0065 %) while AM and MC dyes showed the lowest efficiency (1.0x10-9 % and 0% respectively.
关键词： Morinda Citrifolia,dye sensitized solar cells,Piper Betel,natural dyes,Adonidia Merrillii
更新于2025-09-11 14:15:04
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Tailoring the Optical Properties of Organic D-π-A Photosensitizers: Effect of Sulfur Introduction in the Acceptor Group
摘要： In this work, we present for the first time the synthesis and characterization of potential DSSC organic sensitizers whose cyanoacrylic acceptor/anchoring group was modified by replacement of oxygen with one or more sulfur atoms. Using known carboxylic acid dye DF15 as a reference, their TD-DFT computational analysis indicated that oxygen-sulfur substitution should induce a significant red-shift of the corresponding UV-Vis absorption spectra. Whereas synthesis of monothiocarboxylic derivatives of DF15 was successfully carried out, isolation of the analogous dithiocarboxylic acid proved impossible due to its very low stability: despite that, their relative spectroscopic properties could be compared by analyzing the corresponding benzylic esters. Combined computational and transient absorption spectroscopy studies suggested that photoexcited thiocarboxylic acid 1-SO and thioamide 1-SN were able to inject electrons into nanocrystalline TiO2, and indicated a similar charge injection efficiency for 1-SO relative to DF15. Preliminary DSSC studies showed that, when t-butylpyridine was present in the electrolyte solution, 1-SO was rapidly degraded; however, in the absence of basic additives 1-SO provided a sufficiently stable device, giving a slightly lower efficiency compared to carboxylic sensitizer DF15.
关键词： thiocarboxylic acid,transient absorption spectroscopy,thioamide,Organosulfur compounds,dye-sensitized solar cells
更新于2025-09-10 09:29:36
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CAHM1: A Theory Based Proposal for a New DSSC D-A-π-A Dye
摘要： The initial charge separation process in Dye Sensitized Solar Cells (DSSC) is crucial to their e?ciency. An interesting strategy is to employ D-π-A (donor-π-acceptor) dyes, since the push-pull e?ect may avoid charge recombination instead of electron transfer to the semiconductor. In this work, we propose a method to design a photosensitizer based exclusively on quantum mechanics calculations. Our analysis focused on the in- ?uence of (i) di?erent donor groups and (ii) conformational contributions, on electronic properties aiming to enhance the push-pull e?ect and the alignment with the CB. Based on this study, we propose a new dye, CAHM1, where the selected substituent have a donor character and, at the same time, enable a twisted geometry that enhances charge separation of the ?rst excited state. The system is characterized by a marked push-pull e?ect, as well as, presents absorption spectrum and LUMO energy in a suitable region for DSSC devices.
关键词： Dye Sensitized Solar Cells,DSSC,push-pull effect,CAHM1,quantum mechanics calculations,D-π-A dyes
更新于2025-09-10 09:29:36
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Studies on Photoelectric Performance of Natural Dyes from Safflower
摘要： The TiO2 nanoparticles thin films was used to prepare the dye-sensitized solar cells (DSSCs) as photoelectrode and natural dyes as photosensitizers. The sensitized TiO2 based solar cell used nature dye carthain and hydroxysafflor yellow A as sensitizer, which were extracted from the abundant Hehuang safflowers in Qinghai province of China. The DSSCs exhibited short-circuit photocurrent density (Jsc) value of 2.193 mA·cm-2, open-circuit photovoltage (Voc) of 0.61 V, the fill factor (FF) of 0.50 and solar energy-to-electricity conversion yield (η) of 0.664 %. Natural dyes as sensitizers for DSSCs are promising because of their environmental friendliness, low-cost and designable polychrome modules.
关键词： Natural dye,Dye-sensitized solar cells,Safflower
更新于2025-09-09 09:28:46
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Optoelectrical characterization of different fabricated donor substituted benzothiazole based sensitizers for efficient DSSCs
摘要： In the present work, we have synthesized three novel organic sensitizers, based on various donor groups which are in conjugation with similar bridge and acceptor moieties. We have studied the effect of donor groups with common bridge and anchoring group sensitizers on optical, electrochemical, dye sensitized solar cell’s performance and electron transfer interface properties as well. We have also represented systematically analysis of influence of donor groups in structural geometry, energy distribution and energy-transfer from HOMO to LUMO by density functional theory. The B2 sensitizer contains highly conjugated, strong electron withdrawing group and electron transfer form donor group to anchoring group happens much more rapid in it compared to other two sensitizers. However, B2 sensitizer has exhibited 6.23% efficiency under 1 sun light illumination. The influence of donor groups on device performance was clearly shown on IPCE spectrum as well. The studied effect of chenodeoxycholic acid (CDCA) in a sensitizer’s solution as a co-absorbent on the DSSCs performance and exhibited highest efficiency (6.68 %). We found that co-absorbent can be hinder the sensitizer aggregation and rise electron injection yield and thus short circuit current (Jsc). The device interface kinetics was studied by electrochemical impedance spectroscopy and calculated electron lifetime, interface charge transfer resistance and recombination resistance by fitted equivalent circuit. Moreover, we have checked high performance device stability up to 700 hr, under continuous 1 sun light illumination.
关键词： Sensitizers,Metal-free dye,Benzothiadiazole,Influence of donors,Dye-sensitized solar cells (DSSCs)
更新于2025-09-09 09:28:46