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In situ synthesis of ternary nickel iron selenides with high performance applied in dye-sensitized solar cells
摘要： Comparing with the binary chalcogenides, the ternary chalcogenides may achieve higher electrical conductivity and electrochemical activity due to the synergistic effect of the different metal cations. Herein, ternary nickel iron selenide (Ni0.5Fe0.5Se2) was fabricated through a facile one-pot solvothermal method with the assistance of glucose for the first time. The dye-sensitized solar cells (DSSCs) were assembled with the as-prepared Ni0.5Fe0.5Se2 as counter electrode (CE). Electrochemical measurements indicated that the Ni0.5Fe0.5Se2 possessed small electron transfer resistance at the interface between electrode and electrolyte, great electrocatalytic activity and reaction kinetics toward the reduction of triiodide. Compared with conventional Pt CE (7.24%), the DSSCs based on Ni0.5Fe0.5Se2 CE achieved a greater power conversion efficiency of 7.89%. Furthermore, this study provides a new idea and strategy with convenient method to synthesize Pt-free alternative materials.
关键词： Counter electrode,Solvothermal method,Dye-sensitized solar cells,Ternary nickel iron selenide
更新于2025-11-14 17:04:02
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Grafting cobalt sulfide on graphene nanosheets as a counterelectrode for dye-sensitized solar cells
摘要： In the present work a composite counter electrode of graphene nanosheets grafted cobalt sulfide was fabricated through a facile synthetic route, in which cobalt sulfide nanoparticles were successfully grafted on the surface of graphene nanosheets. Used as a counter electrode in DSSC, a power conversion efficiency of 7.28% can be achieved. Such a result might be contributed to the facts that this counter electrode composed of graphene nanosheets grafted cobalt sulfide has a good stability and electrochemical catalytic performance toward triiodide reduction reaction.
关键词： photovoltaic performance,graphene nanosheets,cobalt sulfide,counterelectrode,Dye-sensitized solar cell
更新于2025-11-14 17:04:02
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A simple method to synthesize low-cost carbon modified TiO <sub/>2</sub> counter electrodes for high-efficiency dye-sensitized solar cells
摘要： Low cost and stable counter electrodes (CE) for dye-sensitized solar cells (DSSC) are promising for widespread use. In this paper, we report a simple and effective method to synthesize carbon modified TiO2 (TiO2/C) thin film as an abundant low cost CE for high-efficiency DSSC. The TiO2 paste layer contained organic compound was deposited on FTO glass substrate by a screen-printing method. When annealing the TiO2 paste layer at 450–550 °C under Ar flow, these organic compounds are decomposed to carbon to form carbon coated TiO2 nanoparticles. When used as a CE of DSSCs, the experimental results point out that the photoelectric conversion efficiency of DSSCs was obviously improved to near that of the referenced Pt CE. For TiO2/C is one of the cheapest and most stable materials, this TiO2/C can be used as a low cost CE for large scale high efficient DSSCs.
关键词： carbon nano materials,solar energy materials,counter electrode,dye-sensitized solar cell
更新于2025-11-14 17:04:02
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Ups and Downs of Water Photodecolorization by Nanocomposite Polymer Nanofibers
摘要： Given the exponentially expanding water pollution causing water scarcity, there is an urgent need for operative nanotechnological systems that can purify water, with insignificant energy consumption, and rapidly. Here, we introduce a nanocomposite system based on TiO2 nanoparticles (NPs) and PES nanofibers (NFs) that can adsorb and then photodecompose organic water pollutants such as dye molecules. We evaluate pros and cons of this system with respect to its purification efficiency and structural properties that can be impacted by the photocatalytic activity of the nanofillers. While the material is superhydrophilic and able to remove 95% methylene blue (MB) from water via adsorption/photodecomposition, its thermomechanical properties decline upon UV irradiation. However, these properties still remain at the level of the neat NFs. The removal behavior is modeled by the first- and second-order kinetic models from the kinetic point of view. The nanocomposite NFs’ removal behavior complies much better with the second-order kinetic model. Overall, such feedbacks implied that the nanocomposite can be effectively applied for water treatment and the structural properties are still as reliable as those of the neat counterpart.
关键词： nanofiber,photodegradation,dye removal,water treatment,photocatalysis
更新于2025-11-14 17:03:37
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A mitochondria targetable and viscosity sensitive fluorescent probe and its applications for distinguishing cancerous cells
摘要： The determination of mitochondrial viscosity is of great importance owing to its crucial roles in the diffusion-mediated processes. It has demonstrated that the viscosity in cancer cells is higher than normal cells. Developing of viscosity sensitive fluorescent probes for distinguishing normal cells and cancer cells is necessary. Herein, we present a mitochondrial-targeting fluorescent probe PFV for the detection of viscosity in live cells. It exhibited outstanding sensitivity to viscosity, free from disturbing by ROS/sulfuret even at high concentrations. Equipped with mitochondria targeting ability, PFV was then applied to mitochondrial viscosity detection. Most importantly, by viscosity monitoring PFV successfully differentiated normal hepatic cells and cancerous hepatic cells. The present study would offer a broadly applicable for the determination of viscosity in complex systems.
关键词： fluorescence imaging,mitochondrial viscosity,fluorescent probe,cyanine dye,viscosity
更新于2025-11-14 15:29:11
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Electrospun carbon nanofibers decorated with Pt-Ni2P nanoparticles as high efficiency counter electrode for dye-sensitized solar cells
摘要： Carbon nanofibers (CNs) supported by Pt and Ni2P nanoparticles (Pt-Ni2P/CNs) are successfully synthesized and explored as counter electrodes for dye-sensitized solar cells (DSSCs) for the first time. Pt and Ni2P nanoparticles are prepared by stabilization and carbonization of electrospun nanofibers, and subsequently controllable Pt and Ni2P nanoparticles are grown on surface of CNs obtained through redox reaction. A series of electrochemical measurements analysis confirm that the Pt-Ni2P/CNs composite have simultaneously superior electrocatalytic activity and enhanced electrical conductivity compared with those of individual CNs and Pt. Accordingly, DSSCs using the composite Pt-Ni2P/CNs as a counter electrode exhibit a excellent photovoltaic performance (power conversion efficiency of 9.11%), which is much higher than conventional Pt/CNs counter electrode (power conversion efficiency of 8.35%), owing to the collective effect of the high electrical conductivity originated from carbon nanofibers and superior electrocatalytic activity arising from Pt/CNs nanoparticles.
关键词： counter electrode,electrospun,dye-sensitized solar cells,Pt and Ni2P nanoparticles,redox reaction
更新于2025-11-14 15:27:09
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Au@Ag@Ag2S heterogeneous plasmonic nanorods for enhanced dye-sensitized solar cell performance
摘要： Au@Ag@Ag2S heterogeneous nanorods (NRs) with two strong plasmonic absorptive bands were developed for boosting the performance of dye-sensitized solar cells, and the remarkably enhanced plasmonic devices were achieved. By doping different concentrations of the Au@Ag@Ag2S NRs within the TiO2 photoanode layers, various enhanced effects of the plasmonic devices were obtained. With the incorporation of the typical Au@Ag@Ag2S NRs (their aspect ratios: 2.7) into the TiO2 photoanodes, the top efficiency of 6.51% of the fabricated plasmonic photovoltaic devices at their doped concentrations of the 2.31% was observed, exhibiting dramatic 40% enhancement than that of the conventional dye-sensitized solar cells (bare device: 4.65%). Benefiting from effective surface plasmon effects of the Au@Ag@Ag2S NRs, the light-harvesting abilities of photoanodes and dyes in devices are dramatically enhanced, which in return boost the whole performance of photovoltaic devices significantly.
关键词： Dye-sensitized solar cell,Nanorod,Power conversion efficiency,Plasmonic effect
更新于2025-11-14 15:27:09
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Near-infrared (NIR) surface-enhanced Raman spectroscopy (SERS) study of novel functional phenothiazines for potential use in dye sensitized solar cells (DSSC)
摘要： Near-infrared (NIR) surface-enhanced Raman spectroscopy (SERS) is used to investigate the interaction between six novel phenothiazine-merocyanine dyes containing the three different functional groups rhodanine, 1,3-indanedione and cyanoacylic acid with plasmonic nanomaterials, to decide if the incorporation of plasmonic nanoparticles could enhance the efficiency of a Gr?tzel-type solar cell. The studies were carried out in the solution state using spherical and rod-shaped gold nanostructures. With KCl induced agglomerated spherical gold nanoparticles, forming SERS hot spots, the results showed low detection limits between 0.1 mmol L?1 for rhodanine containing phenothiazine dyes, because of the formation of Au–S bonds and 3 mmol L?1 for cyanoacrylic acid containing dyes, which formed H-aggregates in the watery dispersion. Results with gold nanorods showed similar trends in the SERS measurements with lower limits of detection, because of a shielding effect from the strongly-bound surfactant. Additional fluorescence studies were carried out to determine if the incorporation of nanostructures leads to fluorescence quenching. Overall we conclude that the addition of gold nanoparticles to rhodanine and 1,3-indanedione containing phenothiazine merocyanine dyes could enhance their performance in Gr?tzel-type solar cells, because of their strong interactions with plasmonic nanoparticles.
关键词： surface-enhanced Raman spectroscopy,plasmonic nanoparticles,dye sensitized solar cells,phenothiazine-merocyanine dyes,Near-infrared
更新于2025-11-14 15:16:37
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Nickel Selenide Nanoparticles as a Cheap Alternative for Pt-Counter Electrode in Dye-Sensitized Solar Cells
摘要： Colloidal nickel selenide nanocrystals (NCs) of two different compositions i.e., Ni3Se2 and Ni3Se4, where one is Ni-rich while another is Se-rich are synthesized using the hot injection method by merely changing the injection and growth temperature while keeping the rest of the reaction conditions like solvent, ligands, amount of precursors and reaction time identical. These nanocrystals exhibit electrocatalytic activity in the reduction of triiodide (I?3) to iodide (3I?), therefore employed as counter electrodes (CE) in dye-sensitized solar cells (DSCs). The DSC based on nickel selenides displays an efficiency of 6.4%, comparable to the Pt-based cells prepared by us.
关键词： Ni3Se4,Dye-Sensitized Solar Cell,Ni3Se2,Counter Electrode
更新于2025-10-22 19:40:53
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Application of chemometric methods to resolve intermediates formed during photo- catalytic degradation of methyl orange and textile wastewater from Ethiopia
摘要： The efficiency of two catalysts (TiO2 and TiO2 supported on zeolite) for the photocatalytic degradation of methyl orange dye and wastewaters from Ethiopian textile industry was evaluated by chemometric methods from UV/Vis data of the reaction mixtures at different times. Multivariate curve resolution statistical analysis combined with an alternating least squares algorithm (MCR-ALS) proved to be an efficient method to resolve the different intermediates present during the photocatalytic degradation of the pollutants and to provide information about their evolution with time. Methyl orange photodegradation at pH = 3 showed different intermediate and concentration profiles than at pH = 6. The evolution of intermediates from textile wastewater photodegradation could also be resolved by this method. From the concentration profile or the reactants, a kinetic study was done. Results revealed that all the photodegradation reactions followed a first order kinetics. When TiO2 supported in Zeolite is used, reactions are in general slower, probably due to a mechanism of adsorption/desorption.
关键词： Wastewater,Chemometrics,Dye photodegradation,Methyl Orange,MCR-ALS
更新于2025-09-23 15:23:52