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oe1(光电查) - 科学论文

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出版时间
  • 2019
研究主题
  • Dye-sensitized solar cell
  • Photoelectrode
  • Light scattering layer
  • Transmittance
  • White pigment (R902+)
  • Rutile titanium dioxide
应用领域
  • Optoelectronic Information Materials and Devices
机构单位
  • Tribhuvan University
352 条数据
?? 中文（中国） ▾

  • Hybrid of Graphene based on quaternary Cu2ZnNiSe4 a??WO3 Nanorods for Counter Electrode in Dye-sensitized Solar Cell Application

    摘要： A novel nanohybrid of graphene-based Cu2ZnniSe4 with WO3 nanorods (G-CZNS@W) was successfully synthesized via a simple hydrothermal method to use as a counter electrode (ce) for dye-sensitized solar cells (DSSCs). The characterization technique confirmed the structural and morphologies of the G-CZNS@W nanohybrid, which could show rapid electrons transfer pathway through the WO3 nanorods. Moreover, the as-fabricated G-CZNS@W nanohybrid exhibited synergetic effect between G-cZnS and a Wo3 nanorod, which could affect the electrocatalytic activity towards triiodide reaction. The nanohybrid exhibits an excellent photovoltaic performance of 12.16%, which is higher than that of the standard pt electrode under the same conditions. the G-cZnS@W nanohybrid material as ce thus offers a promising low-cost Pt-free counter electrode for DSSC.

    关键词： Counter Electrode,Graphene,WO3 nanorods,Dye-sensitized Solar Cells,Cu2ZnniSe4

    更新于2025-09-23 15:19:57

  • One-step electrodeposited CoSe2 nano-reticular with high electroconductivity and electrocatalytic as a counter electrode for dye sensitized solar cell

    摘要： Herein, a nano-reticular structure cobalt diselenide (CoSe2) film with high electroconductivity and electrocatalytic has been synthesized by one-step electrodeposition method and is applied as a counter electrode for dye sensitized solar cell (DSSC). Cyclic voltammetry (CV) measurements with different potential windows are carried out to reveal the deposition mechanism of cobalt selenide, illustrating that the formation of CoSe2 occurred at ?0.62 V via inductive effect reaction with selenide (Se2?). Tafel and CV characterizations demonstrate an excellent electrocatalytic activity of CoSe2 counter electrode towards I?/I3? reduction reaction, which is attributed to the electronic effect between Co and Se and electrochemical active sites, provided by wrinkled layer structure, for adsorption and reduction of I3?. EIS measurements show a great electroconductivity ability of electrodeposition CoSe2 film. The DSSC based on the CoSe2 counter electrode yields a maximum power conversion efficiency of 3.96% (Jsc = 10.84 mA cm?2, Voc = 0.65 V and FF = 55%) under the standard AM 1.5G illumination, which is 1.6 times higher than that of commercial Pt-based DSSC.

    关键词： Electrocatalytic,Dye-sensitized solar cells,Electrodeposition,Cobalt diselenide

    更新于2025-09-23 15:19:57

  • Tuning electrolyte configuration and composition for fiber-shaped dye-sensitized solar cell with poly(vinylidene fluoride-co-hexafluoropropylene) gel electrolyte

    摘要： Efficient energy generation device is desired to couple with soft electronics for driving devices. Due to frequent uses of soft electronics in indoor conditions, flexible fiber-shaped dye-sensitized solar cell (FDSC) is regarded as the most promising energy generation device due to high light-to-electricity conversion maintenance under weak dim light. Using gel electrolyte to assemble FDSC cannot only restrict electrolyte leakage but also improve device flexibility and stability especially under bending conditions. In this study, poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) gel electrolyte is used to fabricate FDSC composed of curled TiO2 nanotube/Ti wire photoanode and Pt counter electrode. It is the first time to control gel electrolyte configuration by adding different PVdF-HFP concentrations, and to optimize iodine concentration in electrolyte regarding to redox ability and electrolyte transmittance. Configuration of gel electrolyte is carefully analyzed to define porous layer and concrete layer of polymer for accumulating liquid electrolyte and inhibiting leakage and evaporation. The highest solar-to-electricity conversion efficiency of 6.32% is obtained for FDSC with 9% PVdF-HFP and 0.04 M I2 in electrolyte, due to well-defined cross-linking structure, abundant redox reactions, and high incident-light illumination through electrolyte. Electrochemical impedance spectroscopy and intensity-modulated photocurrent/photovoltage spectroscopy are used to analyze charge-transfer resistance and charge-collection efficiency.

    关键词： Iodine,Cross-linking,Poly(vinylidene fluoride-co-hexafluoropropylene),Fiber-shaped dye-sensitized solar cell,Gel electrolyte

    更新于2025-09-23 15:19:57

  • Achieving a superior electrocatalytic activity of carbon cloth via atomic layer deposition as a flexible counter electrode for efficient dye-sensitized solar cells

    摘要： Dye-sensitized solar cell (DSSC) is appealing to renewable energy communities because of its attractive features of low cost, facile assembly and short energy payback time. Nevertheless, the commonly used platinum as the counter electrode (CE) encounters great difficulties in its scarcity and noble nature. Herein, we demonstrate a promising and facile route to attain an earth-abundant, high-conductivity Pt-free flexible CE with the controllable catalytic activity via the atomic layer deposition (ALD) of ZnO as the nanoscale sacrificial template. Our result reveals the electrocatalytic activity of carbon cloth as a function of surface morphology can be successfully tailored by the ALD cycle. It can be ascribed to the interplay of ZnO and carbon during carbothermic reduction, offering the synergetic effects of the defects and oxygen doping on the carbon cloth surface as the enhanced catalytic sites for the regeneration of triiodide into iodide. As a proof of concept, the DSSC using the activated carbon cloth via ALD is enabled to deliver a boosted conversion efficiency by 79%, as compared with that using pristine carbon cloth. Such a promising route can open up a perspective for reaching an earth-abundant, high-conductivity carbon-based flexible CE with the superior catalytic activity for the photoelectrochemical cells.

    关键词： Pt-free counter electrode,Dye-sensitized solar cell,Carbon cloth,Atomic layer deposition,ZnO

    更新于2025-09-23 15:19:57

  • Balance between the explored Pt counter electrode in an electrolyte medium and the photoanode for highly efficient liquid-junction photovoltaic devices

    摘要： This work investigates the effect of the ratio of the explored Pt area in the electrolyte medium and the photoanode area (REP) on the performance of dye-sensitized solar cells (DSCs). As a result, the power conversion efficiency of DSCs increases by the ascending REP. The highest power conversion efficiency, which was obtained for the cell with the REP of 64/49, was 8.40%. Furthermore, the relationship between efficiency and fabrication cost is carefully discussed in terms of reducing or enhancing the surface area of CE compared to the photoanode’s surface area. The findings in this work may propose a way for a further development of efficient and large-scale DSCs in the future.

    关键词： explored Pt area,photoanode,counter electrode,Dye-sensitized solar cells

    更新于2025-09-23 15:19:57

  • Modification of Graphene based on Ba2Cu8Ni2Se12 Catalyst with CoS Nanosphere for Counter Electrode for Dye-sensitized solar cell

    摘要： A novel Graphene-Ba2Cu8Ni2Se12 with CoS Nanosphere (GBC) was synthesized via a facile hydrothermal method for use as a Counter electrode (CE) in Dye-sensitized solar cells (DSSCs). In this work, the Ba2Cu8Ni2Se12 (BCNS) and CoS nanosphere were directly grown on graphene sheets with strong interaction. The morphology, electrochemical and photovoltaic performances of GBC were studied. The GBC CE in bifacial DSSCs showed higher power conversion efficiency (12.37%), which is comparable to the traditional Pt electrode (4.07%). This value noticeably that the synergetic effect of the GBC structure provides a large catalytic active area and excellent of electron transfer partway. The GBC CE exhibiting good device performance, which can serve as low-cost CE than Pt for the DSSC application.

    关键词： CoS Nanosphere,Counter electrode,Graphene,Dye-sensitized solar cells,Ba2Cu8Ni2Se12

    更新于2025-09-23 15:19:57

  • Sputtered and heat-treated TiO2 electrodes for dye-sensitized solar cells applications

    摘要： In this work, sputtering method has been used to deposit thin films of TiO2 to be utilized for dye-sensitized solar cells (DSSCs). The obtained TiO2 films have been annealed up to 550 °C. X-ray diffraction (XRD) results have shown that there is no change in the crystal structure upon annealing. In addition, two phases of TiO2, anatase and rutile, have been observed; however, the anatase phase is dominant, especially with annealing, and the particle size was between11.6 nm and 20 nm. The optical properties of the prepared and annealed films have been investigated using spectrophotometer. The transmittance was observed to decrease with annealing which can be attributed to the improvement of the crystalinity of the films upon annealing. The absorption and reflectance have been observed to decrease with annealing including some effects from the scattering of light in TiO2 films due to the multilayer structure. The prepared TiO2 films have been used to construct DSSCs. The I–V characteristics of these cells have shown a good performance with an increase of the efficiency from 1.24 to 1.98 for the as-deposited and annealed sample at 550 °C, respectively. Furthermore, the constructed DSSCs have exhibited stability and reproducibility over time.

    关键词： TiO2,Sputtering method,Dye-sensitized solar cell,Conversion efficiency

    更新于2025-09-23 15:19:57

  • Plasma-processed CoSn/RGO nanocomposite: A low-cost and sustainable counter electrode for dye-sensitized solar cells

    摘要： The high cost of state-of-the-art Pt counter electrodes (CEs) hinders the large-scale applications of dye-sensitized solar cells (DSCs). The development of Pt-free catalysts while maintaining state-of-the-art catalytic activity for CE materials is one mean to reduce costs. Here, CoxSn1-x/reduced graphene oxide (RGO) (0 ≤ x ≤ 1) nanohybrids were synthesized and employed as inexpensive, stable, and earth-abundant CEs in DSCs. The synthesis was performed through the plasma-assisted reduction of the oxygen functional groups of the graphene oxide along with the immobilization of bimetallic nanoparticles (NPs) on the surface of RGO. The optimization of the composition of the alloy NPs for the highest e?ciency of DSC yields the Co0.9Sn0.1/RGO nanocomposite. The highest device performance correlates well with the experimentally obtained lowest charge transfer resistance in conjunction with the highest electrocatalytic activity of the Co0.9Sn0.1/RGO CE. The DSC employed the synthesized CE showed good stability over long term operation. Both the developed CoSn/RGO nanohybrids and the strategy used for their synthesis are cost-e?ective. Our results provide economically implementable and green nanotechnology for e?cient and stable DSCs required for commercialization.

    关键词： Plasma reduction,Bimetalic alloy CoxSn1-x,Nanohybrids,Reduced graphene oxide,Counter electrode,Dye-sensitized solar cells

    更新于2025-09-23 15:19:57

  • Transformation of a liquid electrolyte to a gel inside dye sensitized solar cells for better stability and performance

    摘要： A gel electrolyte based on a metal-organic framework (MOF), comprised of Al3+ and trimesic acid, was used in dye-sensitized solar cells. The electrolyte was gelated inside the solar cell to ensure the best interfacial connection between the TiO2 photoanode and electrolyte ingredients. The photovoltaic performance of the solar cells showed that the gel has a good ability to preserve the function of liquid electrolytes. By optimizing the ratio of MOF and liquid electrolyte, the current density was improved, which was due to the increase in the redox couple I-/I3- content in the gel electrolyte. The open-circuit voltage was affected because of the change in the conduction band of TiO2 by the introduction of Al3+ ions and also because of electron recombination. Thus, a slightly higher efficiency was achieved using the gel electrolyte compared to the liquid electrolyte based cells. A superior stability was achieved with the MOF gel electrolyte under thermal stress at 60 °C for 250 h, while the efficiency of cells with liquid electrolyte deteriorated continuously under the same conditions. The drop in efficiency in the liquid electrolyte cells, was 24%, compared to only a 6% drop in the MOF gel electrolyte cells.

    关键词： Stability,Metal organic framework,Dye sensitized solar cells,Thermal stress,Gel electrolyte

    更新于2025-09-23 15:19:57

  • Porphyrin dyes bearing heterocyclic anchoring groups for dye-sensitized solar cells with enhanced efficiency and long-term stability: further optimization of champion porphyrin dye SM315

    摘要： In order to further enhance the long-term stability of porphyrin-based dye-sensitized solar cells (DSSCs) without losing their high efficiency, a serious of porphyrin sensitizers based on the champion dye SM315 but differing in the anchoring groups were theoretically investigated. Compared with SM315 with carboxylic acid anchoring groups, our results demonstrate that porphyrin dyes with hydantoin and barbituric acid anchoring groups exhibit stronger adsorption stability because of the larger orbital interactions between the dye and the semiconductor surface, according to the energy decomposition analysis. Furthermore, porphyrin dyes with these two heterocyclic anchoring groups can also display a superior or comparable charge separation and injection, light harvesting ability and conduction band energy shift, which are the key factors that affect the performance of DSSCs. These results highlight the great potential hydantoin and barbituric acid anchoring groups possess as effective alternatives to carboxylic acid anchoring groups for porphyrin dyes, which could yield an enhanced efficiency and long-term stability and worthy of being experimentally synthesized.

    关键词： Adsorption stability,Porphyrin,Heterocyclic anchoring groups,Dye-sensitized solar cells,Theoretical study

    更新于2025-09-23 15:19:57