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Energies 2018, 11(2), 281; https://doi.org/10.3390/en11020281

Fabrication of Cost-Effective Dye-Sensitized Solar Cells Using Sheet-Like CoS2 Films and Phthaloylchitosan-Based Gel-Polymer Electrolyte

1
Department of Electrical and Electronics Engineering, School of Electronics and Electrical Technology (SEET), Kalasalingam Academy of Research and Education (KARE), Krishnankoil, Virudhunagar 626126, Tamil Nadu, India
2
Research Chair on Laser Diagnosis of Cancers, Department of Physics and Astronomy, College of Science, King Saud University, 11451 Riyadh, Saudi Arabia
3
Department of Physics and Astronomy, College of Science, King Saud University, 11451 Riyadh, Saudi Arabia
4
Centre of Excellence for Energy Research, Sathyabama Institute of Science and Technology, Chennai 600119, India
5
Electrochemistry Research Group, Chemistry Department, College of Science, King Saud University, 11451 Riyadh, Saudi Arabia
*
Authors to whom correspondence should be addressed.
Received: 25 December 2017 / Revised: 16 January 2018 / Accepted: 18 January 2018 / Published: 24 January 2018
(This article belongs to the Section Energy Sources)
Full-Text   |   PDF [4684 KB, uploaded 24 January 2018]   |  

Abstract

Platinum-free counter electrodes (CE) were developed for use in efficient and cost-effective energy conversion devices, such as dye-sensitized solar cells (DSSCs). Electrochemical deposition of CoS2 on fluorine-doped tin oxide (FTO) formed a hierarchical sheet-like structured CoS2 thin film. This film was engaged as a cost-effective platinum-free and high-efficiency CE for DSSCs. High stability was achieved using a phthaloychitosan-based gel-polymer electrolyte as the redox electrolyte. The electrocatalytic performance of the sheet-like CoS2 film was analyzed by electrochemical impedance spectroscopy and cyclic voltammetry. The film displayed improved electrocatalytic behavior that can be credited to a low charge-transfer resistance at the CE/electrolyte boundary and improved exchange between triiodide and iodide ions. The fabricated DSSCs with a phthaloychitosan-based gel-polymer electrolyte and sheet-like CoS2 CE had a power conversion efficiency (PCE, η) of 7.29% with a fill factor (FF) of 0.64, Jsc of 17.51 mA/cm2, and a Voc of 0.65 V, which was analogous to that of Pt CE (η = 7.82%). The high PCE of the sheet-like CoS2 CE arises from the enhanced FF and Jsc, which can be attributed to the abundant active electrocatalytic sites and enhanced interfacial charge-transfer by the well-organized surface structure. View Full-Text
Keywords: CoS2 film; electrocatalytic activity; counter electrode; dye-sensitized solar cells; gel-polymer electrolyte CoS2 film; electrocatalytic activity; counter electrode; dye-sensitized solar cells; gel-polymer electrolyte
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Prasad, S.; Durairaj, D.; AlSalhi, M.S.; Theerthagiri, J.; Arunachalam, P.; Durai, G. Fabrication of Cost-Effective Dye-Sensitized Solar Cells Using Sheet-Like CoS2 Films and Phthaloylchitosan-Based Gel-Polymer Electrolyte. Energies 2018, 11, 281.

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