Synthesis and Characterization of Carboxymethyl κ-Carrageenan for Dye-Sensitized Solar Cells Application

2012 ◽  
Vol 501 ◽  
pp. 242-246 ◽  
Author(s):  
N. N. Mobarak ◽  
Nazaruddin Ramli ◽  
Azizan Ahmad
Keyword(s):  
Ionic Conductivity ◽  
Electrochemical Impedance ◽  
Dye Sensitized Solar Cells ◽  
Solution Casting ◽  
Anionic Polymer ◽  
Casting Technique ◽  
Dye Sensitized ◽  
Solution Casting Technique ◽  
Sensitized Solar Cells

κ-Carrageenan is an anionic polymer extracted from marine red algae. In order to increase conductivity of the κ-carrageenan, carboxymethyl κ-carrageenan was synthesized by the reaction of κ-carrageenan with monochloroacetic acid. A polymer electrolyte comprising κ-carrageenan and carboxymethyl κ-carrageenan was prepared by solution-casting technique. The films were characterized by Reflection Fourier Transform Infrared spectroscopy (ATR-FTIR) to investigate the presence of the complexes. Electrochemical Impedance Spectroscopy was conducted to obtain ionic conductivity. Ionic conductivity was found to increase with the addition of carboxymethyl group on carrageenan. The conductivity achieved for κ-carrageenan and carboxymethyl κ-carrageenan were 5.34×10-7 S cm−1 and 2.02×10−4 S cm-1, respectively.

scholarly journals Influence of Different Cations of N3 Dyes on Their Photovoltaic Performance and Stability

2009 ◽  
Vol 2009 ◽  
pp. 1-7 ◽  
Author(s):  
Luísa Andrade ◽  
Shaik M. Zakeeruddin ◽  
Mohammad K. Nazeeruddin ◽  
Helena Aguilar Ribeiro ◽  
Adélio Mendes ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Dye Sensitized ◽  
Sodium Cations ◽  
Sensitized Solar Cells

The N3 dye was modified by substituting two of its protons by potassium or sodium cations. The performance and stability of dye-sensitized solar cells incorporating the new dyes were evaluated under light soaking(1000 W⋅m-2)at50∘C. Photocurrent measurements demonstrated that proton substitution by potassium cations rends the system more stable. Further characterization of the potassium-based devices was performed by electrochemical impedance spectroscopy to investigate the charge-transfer phenomena occurring at the different interfaces of the cells.

Transparent Graphene-Platinum Films for Advancing the Performance of Dye-Sensitized Solar Cells

2013 ◽  
Vol 1549 ◽  
pp. 47-52
Author(s):  
P. T. Shih ◽  
R. X. Dong ◽  
K. C. Ho ◽  
J. J. Lin
Keyword(s):  
Solar Cells ◽  
Electrochemical Impedance ◽  
Dye Sensitized Solar Cells ◽  
Light Illumination ◽  
Solution Casting ◽  
Casting Method ◽  
Counter Electrodes ◽  
Dye Sensitized ◽  
Solution Casting Method ◽  
Sensitized Solar Cells

ABSTRACTTransparent films of platinum nanoparticles on graphene nanohybrids were synthesized in a two-step process. Reduction of homogeneously dispersed Pt precursor and graphene in water and solution coating/annealing afforded thin films with high catalytic performance as counter electrodes in dye-sensitized solar cells (DSSC). The requisite dispersant consisting of poly(oxyethylene)-(POE) segments and cyclic imide functionalities allowed the in-situ reduction of dihydrogen hexachloroplatinate by ethanol and the formation of nanohybrids of graphene-supported Pt nanoparticles at 4.0 nm diameter. Characterizations of polymeric dispersants by Fourier-transform infrared spectroscopy, thermogravimetric analysis, and nanohybrids by transmission electron microscope were performed. After screening various compositions of Pt/graphene, the nanohybrid film at the specific ratio of 5/1 by weight was fabricated into a counter electrode (CE) for DSSC by the solution casting method. The evaluation of cell performance demonstrated the most improved power conversion efficiency of 8.00%. This is significant achievement in comparison with 7.14% for the DSSC with the conventional platinum sputtered CE. Furthermore, the solution casting method allows the preparation of transparent CE films that are suitable for using as rear-illuminated DSSC. The approach was proven to be feasible by measuring the cell efficiency under rear light illumination. The power efficiency up to 7.01%, comparable to 8.00% by a normally front illumination, has been accomplished. In contrast, the rear illumination at merely 2.36% efficiency was obtained for the DSSC with sputtered platinum CE. Analyses of cyclic voltammetry, electrochemical impedance spectra were well correlated to the high efficiency of the performance caused by this nanohybrid film.

QUASI-SOLID-STATE DYE-SENSITIZED SOLAR CELLS WITH A HIGH MOLECULAR GEL POLYMER ELECTROLYTE BASED ON PEO/P(VDF-HFP)

2010 ◽  
Vol 09 (04) ◽  
pp. 257-261 ◽  
Author(s):  
D. W. ZHANG ◽  
X. D. LI ◽  
S. M. HUANG ◽  
Z. A. WANG ◽  
J. H. SHI ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solid State ◽  
Ionic Conductivity ◽  
Polymer Electrolytes ◽  
Electrochemical Impedance ◽  
Dye Sensitized Solar Cells ◽  
Weight Ratio ◽  
Volume Ratio ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Quasi-solid-state dye-sensitized solar cells were fabricated using a high molecular polymer redox electrolyte. Poly(ethylene oxide) (PEO) and Poly(vinylidenefluoride-co-hexafluoropropylene) (P(VDF-HFP)) were used to form a stable quasi-solid structure and a three-dimensional gel polymer network structure. The polymer electrolytes were composed of LiI , I2 , and DMPII in the mixture of propylene carbonate (PC) and γ-butyrolactone (GBL) with different volume ratios. A metal-free organic dye (indoline dye D102) was used as a sensitizer. The ionic conductivity of the gel polymer electrolytes was measured with Electrochemical Impedance Spectroscopy (EIS). The dependence of the ionic conductivity on the volume ratio of PC to GBL was investigated. The volume ratio of the mix solvent, weight ratio of PEO/P(VDF-HFP), and the weight ratio of TiO2 fillers were optimized. The optimized quasi-solid-state cell exhibited an efficiency of 5.49% at full sunlight (air mass 1.5, 60 mW/cm2) irradiation.

Effects of NiO/TiO2 Mixed Nanoparticles on Quasi-Solid Dye-Sensitized Solar Cells

2014 ◽  
Vol 898 ◽  
pp. 51-55
Author(s):  
Ying Yang ◽  
Jia Rui Cui ◽  
Peng Fei Yi ◽  
Xue Yi Guo
Keyword(s):  
Magnetic Field ◽  
Solar Cells ◽  
Ionic Conductivity ◽  
Polymer Electrolyte ◽  
Electrochemical Impedance ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Dye Sensitized ◽  
Mixed Nanoparticles ◽  
Sensitized Solar Cells

In this work, a magnetic polymer electrolyte composed by agarose as polymer matrix, NMP as solvent and NiO/TiO2mixed nanoparticles as modifier was investigated and employed in the solid-sate dye-sensitized solar cells (DSSCs). The influence of NiO/TiO2mixed nanoparticles on the morphology and ionic conductivity of the polymer electrolyte was studied by SEM and electrochemical impedance spectra. From SEM analysis, the mixing of NiO with TiO2nanoparticle in polymer electrolyte leads to smooth surface of the polymer electrolyte films. The polymer electrolyte modified by mixed nanoparticles with NiO: TiO2ratio of 1:4 shows the maximum ionic conductivity of 6.64×10-3S·cm-1. From photovoltaic performance study, the increase of NiO: TiO2ratio in polymer electrolyte leads to an improvement in light-to-electric conversion efficiency. The optimal photoelectric efficiency is achieved at NiO: TiO2ratio of 1: 4. Besides, after treatment under an external magnetic field, the DSSC modified with NiO: TiO2ratio of 1: 4 exhibits a better photovoltaic performance than that of DSSC without magnetic field treatment.

scholarly journals The development of poly(ethylene oxide) reinforced with a nanocellulose-based nanocomposite polymer electrolyte in dye-sensitized solar cells

2021 ◽  
Author(s):  
Mohd Saiful Asmal Rani ◽  
Nur Athirah Abdullah ◽  
Muhammad Hanif Sainorudin ◽  
Masita Mohammad ◽  
Salmiah Ibrahim
Keyword(s):  
Polymer Electrolyte ◽  
Dye Sensitized Solar Cells ◽  
Casting Technique ◽  
Dye Sensitized ◽  
Nanocomposite Polymer ◽  
Nanocomposite Polymer Electrolyte ◽  
Solution Casting Technique ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Sensitized Solar Cells

Here, we describe a nanocomposite polymer electrolyte prepared using a solution casting technique.

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