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A Blue Photosensitizer Realizing Efficient and Stable Green Solar Cells via Color Tuning by the Electrolyte
摘要： Semitransparent dye-sensitized solar cells (DSCs) are appealing as aesthetically pleasing and colorful see-through photovoltaics. Green semitransparent DSCs have been presented, but the best ones rely on green zinc porphyrin photosensitizers and high volatile electrolytes. For potential outdoor applications, the zinc porphyrin DSCs employing ionic liquid electrolytes merely reached a power conversion efficiency (PCE) of 6.3% even with opaque mesoporous TiO2 films. Herein, the new green DSC is realized by using a blue organic photosensitizer in conjunction with an orange ionic-liquid-based electrolyte, presenting a simple and an effective path for color tuning of photovoltaics. The new approach allows for broadly modulating the color from spring green to cyan by tuning the contributions of the light absorption by the dye-sensitized TiO2 film and the electrolyte layer. The new semitransparent DSCs with spring green to cyan colors have PCEs ranging from 6.7% to 8.1% and show stability for 1000 h under accelerated ageing test at 80 °C, superior to the zinc porphyrin DSCs. The findings pave a new way to achieve efficient and stable colorful solar cells.
关键词： semitransparent solar cells,blue dyes,porphyrin dyes,dye-sensitized solar cells,ionic liquid electrolytes
更新于2025-09-23 15:19:57
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Porous membrane of polyindole and polymeric ionic liquid incorporated PMMA for efficient quasi-solid state dye sensitized solar cell
摘要： Stable and efficient electrolyte for effective solar energy conversion is a persistent aim of dye-sensitized solar cell (DSSC). In this work, a novel honeycomb-like porous membrane (PMMA/PIL/PIN) based quasi-solid state (QSS) electrolyte was prepared by using the mixtures of synthesized polyindole (PIN),poly(3-decyl-1-vinyl imidazolium iodide) (PIL) and PMMA through non-solvent induced phase inversion method. The membranes were characterized in terms of their structure, morphology, physical properties (electrolyte uptake, porosity) and their photovoltaic and electrochemical effects as electrolyte in DSSC device were investigated. PMMA/PIL/PIN membrane was compared with PMMA/PIL, PMMA membrane and liquid electrolyte (LE) for their performance. The best QSS-DSSC with PMMA/PIL/PIN membrane exhibited high open circuit voltage (Voc), good short circuit current density (Jsc), comparable power conversion efficiency (η = 5.96%) and superior stability (up to 84% of its initial conversion efficiency after 250 h) compared to LE based DSSC. This innovative PMMA/PIL/PIN membrane based electrolyte pronounces the promising aspect for advancement in excellent performance of QSS-DSSC.
关键词： Polyindole,polymeric ionic liquid,polymer electrolyte,phase inversion,Dye sensitized solar cell
更新于2025-09-23 15:19:57
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Influence of Modification Amount, Reactant Concentration and pH Value on the Photocatalytic Activity of Ionic Liquid Modified TiO2 Under Visible Light
摘要： Ionic liquid ([Bmim]OH, [Bmim]Br, [Bmim]BF4) modified TiO2 catalysts were prepared by hydrothrmal method. XRD and UV-visible spectra were used to characterize the prepared composite materials. Ionic liquid modification did not change the crystalline structure of TiO2 particles but reduced the particle size. [Bmim]OH modified TiO2 shows the obviously enhanced visible light absorption. The influence of ionic liquid types, modification amount, reactant concentration and pH value on the photocatalytic activity of TiO2 catalyst under visible light were investigated.
关键词： Visible light,Ionic liquid,Modification,Photocatalyst,TiO2
更新于2025-09-19 17:15:36
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Facile graft copolymer template synthesis of mesoporous polymeric metal-organic frameworks to produce mesoporous TiO2: Promising platforms for photovoltaic and photocatalytic applications
摘要： Mesoporous polymeric metal-organic frameworks (mesoporous polymeric MOFs) are prepared on fluorine-doped tin oxide (FTO) substrate using hydrophilic terephthalic acid as the ligands, titanium isopropoxide as polymeric MOF precursors, and amphiphilic graft copolymers (i.e., poly(vinyl chloride)-graft-poly(oxyethylene methacrylate) (PVC-g-POEM) as structure-directing agents. The hydrophilic POEM chains in amphiphilic graft copolymers interact with the hydrophilic ligands and polymeric MOF precursors. Following thermal treatment at 500 °C, mesoporous polymeric MOFs are transformed to mesoporous TiO2 with high specific surface area and crystallinity, suitable for photovoltaic and photocatalytic applications. Solid-state dye-sensitized solar cells (ssDSSCs) and dye-sensitized solar cells (DSSCs) fabricated with mesoporous TiO2 photoanodes have efficiencies of 7.45 and 8.43 % at 100 mW/cm2, which is much higher than that of ssDSSCs and DSSCs with photoanodes of conventional TiO2 (5.36 and 7.14 %), respectively. The enhanced efficiency is attributed to good interconnectivity, larger surface area, and high porosity of the mesoporous TiO2, which results in suppressed interfacial charge recombination loss, enhanced electron transport, increased dye loading, and facilitated penetration of the electrolytes. Mesoporous TiO2 shows excellent activity as a photocatalyst for the degradation of humic acid under UV light irradiation.
关键词： Photocatalyst,Dye-sensitized solar cell (DSSC),Metal-organic framework (MOF),Graft copolymer,Titanium dioxide (TiO2),Polymerized ionic liquid,Mesoporous
更新于2025-09-19 17:13:59
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Characterization of Continuousa??Wave Laser Heating Ignition of Ammonium Dinitramidea??Based Ionic Liquids with Carbon Fibers
摘要： Ammonium dinitramide–based energetic ionic liquid propellants (ADN-EILPs) exhibit the advantages of high energy density, low toxicity, and handling safety, and are therefore promising monopropellants. Herein, we characterized the ignition of ADN-EILPs induced by CW laser heating in the presence of carbon fibers, clarifying the effect of laser power and suggesting that ignition reproducibility is influenced by the difference of ADN-EILP osmotic state in carbon fibers or carbon fiber configuration. The observed ignition behavior allowed one to conclude that (i) high-power CW laser heating causes the formation of bubbles on the surface, which disturbs further heating; and (ii) an Arrhenius-type relationship exists between ignition delay and heating rate, suggesting that the strategy of foreshortening ADN-EILP ignition delay by increasing CW laser power has certain limits.
关键词： Carbon fiber,Laser ignition,Ignition delay,Ionic liquid,Ammonium dinitramide (ADN)
更新于2025-09-19 17:13:59
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Synthesis of Low‐Viscosity Ionic Liquids for Application in Dye‐Sensitized Solar Cells
摘要： Two types of ionic liquids (ILs), 1-(3-hexenyl)-3-methyl imidazolium iodide and 1-(3-butenyl)-3-methyl imidazolium iodide, are synthesized by introducing an unsaturated bond into the side alkyl chain of the imidazolium cation. These new ionic liquids exhibit high thermal stability and low viscosity (104 cP and 80 cP, respectively). The molecular dynamics simulation shows that the double bond introduced in the alkane chain greatly changes the molecular system space arrangement and diminishes the packing efficiency, leading to low viscosity. The low viscosity of the synthesized ionic liquids would enhance the diffusion of redox couples. This enhancement is detected by fabricating dye-sensitized solar cells (DSSCs) with electrolytes containing the two ILs and I2. The highest efficiency of DSSCs is 6.85 % for 1-(3-hexenyl)-3-methyl imidazolium iodide and 5.93 % for 1-(3-butenyl)-3-methyl imidazolium iodide electrolyte, which is much higher than that of 5.17 % with the counterpart 1-hexyl-3-methyl imidazolium iodide electrolyte.
关键词： dye-sensitized solar cell,viscosity,electrolyte,ionic liquid
更新于2025-09-19 17:13:59
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Grafted PEO polymeric ionic liquid nanocomposite electrospun membrane for efficient and stable dye sensitized solar cell
摘要： An innovative polymeric ionic liquid (PIL) was synthesized by covalently grafting vinyl imidazolium iodide and methyl methacrylate onto poly (ethylene oxide) (PEO). Synthesised tungsten oxide nanoparticles (WO3NPs) were incorporated into the PIL solution and a polymer nanocomposite fibrous membrane (PVIM-W) was fabricated by electrospinning. This was used as a functional electrolyte for quasi solid state dye sensitized solar cell ((QSS-DSSC). The structure and morphology of the membranes and its physical characteristics as electrolytes were studied. The SEM images showed formation of uniform and beadless nanofibers. Photovoltaic and electrochemical effects of all the electrolytes have been examined. PVIM-W membrane exhibited superior power conversion efficiency (η) of 7.2% and better stability (up to 94.4% of its initial conversion efficiency after 500 h) when compared to the cell with the liquid electrolyte (η= 6.85%) and the ungrafted PEO membrane. This novel PVIM-W membrane based electrolyte shows great prospect for development of efficient and stable QSS-DSSC.
关键词： polymeric ionic liquid,poly (ethylene oxide),Dye sensitized solar cell,electrolyte,electrospun membrane
更新于2025-09-19 17:13:59
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Simultaneous determination of ascorbic acid, dopamine, and uric acid using graphene quantum dots/ionic liquid modified screen-printed carbon electrode
摘要： In this work, graphene quantum dots (GQDs) and ionic liquid (IL) modified screen-printed carbon electrode (GQDs/IL-SPCE) were introduced for the simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA). GQDs were synthesized by directly pyrolyzing citric acid and then dropped onto the surface of IL-SPCE, which was prepared by screen-printing the mixture of IL and carbon ink on a portable substrate. UV-Vis spectrophotometry, fluorescence spectrophotometry, transmission electron microscopy (TEM), scanning electron microscopy (SEM), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) were used to characterize the synthesized GQDs and the modified electrodes. The GQDs/IL-SPCE exhibited excellent electrocatalytic activity for the oxidation of AA, DA, and UA in the mixture solution. Moreover, the anodic peak responses of these three analytes were also resolved into three well-defined peaks. Under the optimized conditions, the linear response ranges for AA, DA, and UA were 25 - 400 μM, 0.2 - 10 μM, and 0.5 - 20 μM, respectively, with low detection limits (σ/N = 3) of 6.64 μM, 0.06 μM, and 0.03 μM, respectively. The proposed sensor exhibited high sensitivity, low cost and successfully applied for the simultaneous detection of AA, DA, and UA in pharmaceutical products and biological samples.
关键词： Graphene quantum dots,Uric acid,Dopamine,Screen-printed carbon electrode,Ionic liquid,Ascorbic acid
更新于2025-09-19 17:13:59
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Polyvinylpyrrolidone with ammonium iodide and 1-hexyl-3-methylimidazolium iodide ionic liquid-doped solid polymer electrolyte for efficient dye sensitized solar cell
摘要： Polymer electrolytes were prepared by doping polyvinylpyrrolidone and ammonium iodide ion with an ionic liquid (IL) 1-hexyl-3-methylimidazolium iodide. Polymer electrolytes were prepared by solution cast technique. Ionic conductivity was improved by the addition of IL which is studied using complex impedance spectroscopy by evaluating ionic conductivity. Using maximum electrical conductivity film, laboratory-scale dye-sensitized solar cell has been fabricated which shows stable performance.
关键词： dye-sensitized solar cell,conductivity,Polymer electrolyte,ionic liquid
更新于2025-09-19 17:13:59
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Performances of ionic liquid matrices with butyl ammonium counterion for matrix-assisted laser desorption/ionization mass spectrometric detection and analysis of sucralfate
摘要： In this work, the performances of two ionic liquid matrices (ILMs) with the same ammonium counterpart for mass spectrometric analysis of the insoluble and soluble sucralfate were compared. Matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS) was performed assisted by the butylammonium salts of a-cyano-hydroxycinnamic acid (CHCAB) and 2,5-dihydroxybenzoic acid (DHBB). CHCAB has a higher IE than DHBB, but better optical properties. CHCAB is more suitable for the analysis of sucralfate, although molecular ions of both compounds were detectable only with low intensities. Thus, optical properties of ILMs are crucial to enhance the sensitivity of MALDI MS detection of polysulfated oligosaccharides.
关键词： sucralfate,a-cyano-hydroxycinnamic acid,Ionic liquid matrices,2,5-dihydroxybenzoic acid,matrix-assisted laser desorption/ionization time-of-flight mass spectrometry
更新于2025-09-16 10:30:52