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Preparation of CoS<sub>2</sub> counter electrode on Ni sheet for QDSSCs via electrophoretic deposition of ZIF-67
摘要： To prepare counter electrode with low cost and high catalytic activity is a way to improve photovoltaic performance of quantum dot-sensitized solar cells. Here, ZIF-67 thin films are prepared on Ni sheet and FTO conducting glass substrate by electrophoretic deposition at different applied electric fields, and then CoS2/Ni and CoS2/FTO electrodes are obtained by vulcanizing the ZIF-67 thin films using thioacetamide. The prepared CoS2 thin films are characterized by the measurements of scanning electron microscope, X-ray photoelectron spectroscopy, X-ray powder diffraction and Fourier transform infrared spectra. Further, the CoS2/Ni and CoS2/FTO thin films are used as counter electrodes to fabricate quantum dot-sensitized solar cells. Photocurrent-voltage curves, electrochemical impedance spectroscopies and Tafel curves are measured to evaluate their photoelectrochemical properties. The short-circuit photocurrent value of quantum dot-sensitized solar cell based on the CoS2/Ni counter electrode is significantly improved compared with that of the cell based on the CoS2/FTO, and thus the light-to-electric conversion efficiency is increased from 1.95% to 3.24%. The enhancement mechanism of electrocatalytic activity and photovoltaic performance of counter electrode prepared on Ni sheet is analyzed to be less resistance of Ni sheet and higher charge transfer rate between counter electrode and electrolyte.
关键词： Quantum dot-sensitized solar cell,CoS2,Counter electrode,Electrophoretic deposition,Ni sheet
更新于2025-11-14 17:03:37
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Facile Synthesis and Characterization of CoS2–SiO2/Chitosan: The Photocatalysis in Real Samples, and Antimicrobial Evaluation
摘要： In the present work, The SiO2, and CoS2–SiO2 nanomaterials and incorporated on chitosan was developed as photocatalyst for photocatalytic degradation of toxic compound such as ethidium bromide as a hazard mutagenic pollutant. The SiO2, and CoS2–SiO2 nanomaterials were prepared using the sol–gel/sonochemical method. Therefore, the nano photocatalyst were characterized by various analytical devices such as scanning electron microscopy (SEM), X-ray diffraction and photoelectron (XRD and XPS) analysis, energy dispersive X-ray spectrometer (EDS), UV–Vis absorption spectroscopy and dynamic light scattering, in order to attain the structural properties. The average crystallite size values of SiO2, CoS2–SiO2, and CoS2–SiO2/Chitosan nanocomposites are 0.63, 40.28, and 69.75 nm, respectively. The band-gap values was obtained 8.9–2.7 eV for SiO2, CoS2–SiO2, and CoS2–SiO2/Chitosan nanocomposites, respectively. The photocatalytic performances of the three prepared nano-photocatalyst were examined by UV-light with help the photo-degradation of ethidium bromide. The CoS2–SiO2/Chitosan nanocomposites photocatalyst shows the high amount of photocatalytic degradation (96.00%) in comparison to SiO2, and CoS2–SiO2 nanomaterials. The results demonstrated that the all prepared nano-photocatalyst under UV irradiation was in pH 5 at 40 min. The antifungal and antibacterial of the SiO2, CoS2–SiO2, and CoS2–SiO2/Chitosan were examined. The CoS2–SiO2/Chitosan (high 11.00 mm inhibition zone) has appropriate antimicrobial activity compared with pure SiO2.
关键词： Antibacterial,Chitosan,CoS2,SiO2,Photocatalytic activity
更新于2025-09-23 15:22:29
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Construction of Pt-free electrocatalysts based on hierarchical CoS2/N-doped C@Co-WS2 yolk-shell nano-polyhedrons for dye-sensitized solar cells
摘要： Nanomaterials with yolk-shell structures are identified as promising advanced catalysts in energy conversion devices due to their larger surface area, more efficient active sites, and shorter charge transfer paths. In this work, we developed a facile template method to synthesize yolk-shell structured CoS2/N-doped C@Co-WS2 (CoS2/NC@Co-WS2) as counter electrode material in dye-sensitized solar cells. In detail, zeolitic imidazolate framework-67 (ZIF-67) as a template reacted with (NH4)2WS4 through an anion conversion/exchange processes, which was followed by the subsequent sulfuration reaction. Additionally, the influence of mass ratio between reactions on the morphologies and electrochemical properties of catalysts were further explored. When the mass ratio of the ZIF-67 precursors and (NH4)2WS4 is 5/1, CoS2/NC@Co-WS2 delivered a superior power conversion efficiency of 9.21% for Pt-free dye-sensitized solar cells which was much higher than that of Pt (8.18%). This result could be attributed to the coordination of multiple elements, prominent yolk-shell structure, and the largest surface area (110 m2 g?1).
关键词： Nano-polyhedrons,CoS2/NC@Co-WS2,Counter electrodes,Catalytic activities,Dye-sensitized solar cells
更新于2025-09-23 15:19:57
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N-doped C/CoSe2@Co–FeSe2 yolk-shell nano polyhedron as superior counter electrode catalyst for high-efficiency Pt-free dye-sensitized solar cell
摘要： Yolk-shell structures based on transition metal chalcogenides (TMCs) have broad application prospects in energy conversion/storage fields. In this work, a facile step-wise synthetic strategy was used to synthesize the yolk-shell structured polyhedrons. The intermediate named as ZIF-67@Co-Fe PBA nanocrystal was formed by the reaction between Co2+ released from ZIF-67 polyhedrons and [Fe(CN)6]3? hydrolyzed from K3[Fe(CN)6]. N-doped carbon/CoSe2@Co-FeSe2 (CoSe2-NC@Co-FeSe2) and N-doped carbon/CoS2@Co-FeS2 (CoS2-NC@Co-FeS2) polyhedrons with yolk-shell structures were prepared by modifying the ZIF-67@Co-Fe PBA nanocrystals in the annealing process and they have been applied in dye-sensitized solar cells (DSSCs). Noteworthily, CoSe2-NC@Co-FeSe2 and CoS2-NC@Co-FeS2 yolk-shell polyhedrons showed high catalytic activity in accelerating the reduction of triiodide in DSSCs because of the distinctive structural characteristics and favorable chemical compositions. The power conversion efficiency (PCE) of 9.61% and 9.18% were obtained by CoSe2-NC@Co-FeSe2 and CoS2-NC@Co-FeS2 based DSSCs, respectively, which were both superior to that of Pt (8.15%). This as-designed approach implies the new perspective to prepare more types of TMCs with yolk-shell structures in multitudinous areas of energy conversion.
关键词： CoSe2-NC@Co-FeSe2,Transition metal selenides,Yolk-shell polyhedrons,CoS2-NC@Co-FeS2,Dye-sensitized solar cells
更新于2025-09-11 14:15:04