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Carbon Black and Titanium Interlayers Between Zinc Oxide Photo Electrode and Fluorine-Doped Tin Oxide for Dye-Sensitized Solar Cells
摘要： Carbon black and titanium interlayers were deposited on ?uorine-doped tin oxide (FTO) anode layers using radio frequency magnetron sputtering method. On top of them, Zinc oxide (ZnO) photo anode layers were prepared using plasma enhanced chemical vapor deposition technique. ZnO high binding energy as well as good breakdown strength, cohesion, and stability used as a photo electrode material for dye-sensitized solar cells (DSSC), but it does not have a good electrical contact to the FTO anode. To solve this problem, the carbon black and titanium interlayers were deposited. The effect of interlayers on the power conversion ef?ciency (PCE) of DSSCs was investigated. The PCE of the devices with 120-nm-thick interlayers of carbon black or titanium was 5.21 or 4.45%, respectively, which were larger than the PCE of the devices without such interlayers (3.25%). The smooth interface of the carbon black interlayer reduced the interface impedance of the ZnO photo anode effectively. On the other hand, the titanium interlayer with TiO2 on the ZnO side increased the impedance, and decreased the PCE.
关键词： Fluorine-Doped Tin Oxide,Titanium,Carbon Black,Dye-Sensitized Solar Cells
更新于2025-11-14 17:04:02
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Improving the Visible-Light Photocatalytic Activity of Graphitic Carbon Nitride by Carbon Black Doping
摘要： Hydrogen production by water splitting and the removal of aqueous dyes by using a catalyst and solar energy are an ideal future energy source and useful for environmental protection. Graphitic carbon nitride can be used as the photocatalyst with visible light irradiation. However, it typically suffers from the high recombination of carriers and low electrical conductivity. Here, we have developed a facile mix-thermal strategy to prepare carbon black-modified graphitic carbon nitrides, which possess high electrical conductivity, a wide adsorption range of visible light, and a low recombination rate of carriers. With the help of carbon black, highly crystallized graphitic carbon nitrides with built-in triazine and heptazine heterojunctions are obtained. Improved photocatalytic activities have been achieved in carbon black-modified graphitic carbon nitride. The dye removal rate can be three times faster than that of pristine graphitic carbon nitride and the photocatalytic H2 generation is 234 μmol h?1 g?1 under visible light irradiation.
关键词： aqueous dyes removal,hydrogen production,carbon black doping,graphitic carbon nitride,visible-light photocatalytic activity
更新于2025-09-23 15:21:21
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Performance of dye-sensitized solar cell (DSSC) using carbon black-TiO2 composite as counter electrode subjected to different annealing temperatures
摘要： Carbon black-TiO2 composite counter electrode was synthesized via solid state method and subsequently annealed at different annealing temperatures (450–550 °C). The composite was investigated as a counter electrode, acting as an alternative to platinum in a dye-sensitized solar cell. The aim is to obtain a higher conversion efficiency of solar energy being converted into electricity. The synthesized sample was structurally characterized by X-ray diffraction and it was found that annealing temperature strongly enhanced the anatase structure of carbon black-TiO2. The surface morphology and grain size were examined by field emission scanning electron microscopy which showed the presence of mesoporous structure; this is very important for high quality dye and electrolyte distribution. Electrochemical studies of carbon black-TiO2 counter electrodes suggest that increasing the annealing temperature may lead to increased charge transfer resistance which could contribute to decreased catalytic activity. The photovoltaic properties of carbon black-TiO2 were observed to be strongly influenced by the annealing temperature; measurements taken at annealing temperature of 525 °C showed the best photovoltaic properties of JSC = 6.10 mA/cm2, VOC = 0.51 V, FF = 0.89 and η = 2.77%.
关键词： Carbon black-TiO2 composite,Solid state method,Counter electrode,Annealing temperature
更新于2025-09-23 15:21:01
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Enhanced Quality Factor of Polyvinyl formal (PVF) Based Nanocomposites Filled with Zinc Oxide and Carbon Black Nanoparticles for Wireless Sensing Applications
摘要： The present article deals with the preparation of polyvinyl formal based nanocomposites filled with zinc oxide (ZnO) and carbon black nanoparticles using colloidal blending technique. To explore the electrical and structural properties, PVF/ZnO/CBNP nanocomposite films were characterized using Fourier transform infrared (FTIR) spectroscopy, X- Ray diffraction (XRD) and Scanning electron microscopy (SEM). The surface morphology of these nanocomposite films was evaluated using polarized optical microscopy (POM). The structural change in PVF nanocomposite was achieved by incorporating ZnO and CBNP, by homogeneous distribution in polymer nanocomposite. The electrical properties such as impedance and quality factor (Q – factor) of PVF/ZnO/CBNP composite films were elucidated using impedance analyzer in the wide range of frequency from 50 Hz – 20 MHz and temperature in the range 50oC – 150oC. Quality factor was measured as a function of temperature (50 – 150?C) and wide range of frequency from 50 Hz - 20 MHz. The PVF/ZnO/CBNP nanocomposite exhibits high Q-factor (439) for neat PVF films. The incorporation of ZnO at 10% decreases Q-factor to 36.1. Incorporation of CBNP at 5% and ZnO at 5% further reduces the Q-factor to 13.7. With further increase in CBNP content, the Q – factor was found to decrease7.38. Impedance values of PVA/ZnO/CBNP nanocomposites varied at different filler loading in PVF at 3% of CBNP (3.54 X 107?) to 10% of CB (1.48 X 107?). Increase in the CBNP wt% in PVF shows enhanced conductivity. Thus, based on the above results the PVF/ZnO/CBNP nanocomposites can be used for high – k capacitor applications and also for wireless sensing applications.
关键词： wireless sensors,Carbon black nanoparticle,ZnO,Polyvinyl Formal,Impedance,Q- factor
更新于2025-09-12 10:27:22