Cobalt Sulfide as Counter Electrode in p-Type Dye-Sensitized Solar Cells

Congiu, Mirko; Bonomo, Matteo; Marco, Maria Letizia De; Dowling, Denis P.; Carlo, Aldo Di; Graeff, Carlos Frederico de Oliveira

doi:10.1002/slct.201600297

Cited by 22 publications

(23 citation statements)

References 30 publications

(49 reference statements)

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“…However, a need to identify relatively inexpensive counter electrodes with efficiencies comparable to that of Pt‐FTO does exist. Various forms of carbon, metals, nitrides, carbides,, sulfides, oxides and composites have been explored to replace Pt. Conjugated polymers have been explored as a replacement to Pt.…”

Section: Introductionmentioning

confidence: 99%

Silk Cocoon as Counter ‐ Electrode Substrate in Dye ‐ Sensitized Solar Cells

2018

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Electrodes are vital components of energy conversion devices such as dye sensitized solar cells (DSSCs). The widely used electrodes consist of fluorine doped tin oxide (FTO) and platinum. We were interested in identifying a substrate that is available from natural resources and exhibit performance comparable to that of Pt coated FTO (Pt‐FTO). Silk fibers are naturally available and they are mechanically stable. The woven silk fibers are known as silk cocoons (SCs) that structurally resemble widely used carbon paper electrodes. To impart conductivity to the insulating SCs, metal film was coated by an electroless metal plating procedure using polyphenols from green tea. The metal coated SCs were conformaly coated with a conjugated polymer and these electrodes were used as flexible electrodes in DSSCs. The flexible electrode based DSSCs exhibited a power conversion efficiency of 7.2% which is comparable to that of the DSSCs with rigid Pt‐FTO based devices (7.4%).

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Section: Introductionmentioning

confidence: 99%

Silk Cocoon as Counter ‐ Electrode Substrate in Dye ‐ Sensitized Solar Cells

2018

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“…Successively, a redox mediator transfers an electron to regenerate the oxidized dye and is converted into its oxidized form. Contrariwise, in a p-type solar cell, the excited electrons of the dye are transferred directly to the redox mediator while the hole is injected in the valence band of the photocathode, namely NiO (Awais et al 2011;Bonomo;Dini 2016a;Congiu et al 2016a). In both pand n-type DSSCs, the redox mediator is regenerated at the counter-electrode (CE) which consists of a thin layer of catalytic material.…”

Section: Introductionmentioning

confidence: 99%

Pristine and Al-doped hematite printed films as photoanodes of p-type dye-sensitized solar cells

et al. 2016

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We hereby propose a non-expensive method for the deposition of pure and Al-doped hematite photoanodes in the configuration of thin films for the application of dye-sensitized solar cells (DSSC). The electrodes have been prepared from hematite nanoparticles that were obtained by thermal degradation of a chemical precursor. The particles have been used in the preparation of a paste, suitable for both screen printing and doctor blade deposition. The paste was then spread on fluorine-doped tin oxide (FTO) to obtain porous hematite electrodes. The electrodes have been sensitized using N3 and D5 dyes and were characterized through current/voltage curves under simulated sun light (1 sun, AM 1.5) with a Pt counter electrode. Aldoping of hematite showed interesting changes in the physical and electrochemical characteristics of sensitized photoanodes since we could notice the growth of AlFe 2 O 4 (hercynite) as a secondary crystal phase into the oxides obtained by firing the mixtures of two chemical precursors at different molar ratios. Pure and Aldoped hematite electrodes have been used in a complete n-type DSSCs. The kinetics of charge transfer through the interface dye/electrolyte was studied and compared to that of a typical p-type DSSC based on NiO photocathodes sensitized with erythrosine B. The results suggest a potential application of both Fe 2 O 3 and Fe 2 O 3 / AlFe 2 O 4 as photoanodes of a tandem DSSC.

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“…Therefore, better alternatives are necessary for the triiodide reduction in DSSCs. Congiu et al [11] reported that p-DSCs with a CoS anode has an external quantum efficiency very similar to that obtained with anodes consisting of Pr and fluorine-doped tin oxide (FTO). Moreover, p-DSC employing ERY (erythrosine)-sensitized NiO as a photoactive cathode and a CoS anode has a conversion efficiency of 0.026% similar to that obtained with Pt-FTO anodes (0.030%).…”

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confidence: 73%

Photovoltaic Characteristics of Multiwalled Carbon Nanotube Counter-Electrode Materials for Dye-Sensitized Solar Cells Produced by Chemical Treatment and Addition of Dispersant

et al. 2019

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Multiwalled carbon nanotubes (MWCNTs) have excellent electrical conductivity and good chemical stability, and are used as counter electrodes in dye-sensitized solar cells (DSSCs). The counter electrodes collect electrons from the external circuit and catalyze the redox reaction in the electrolyte. Electrocatalysis is an important step for generating energy from triiodide reduction in DSSCs. In this study, chemically treated MWCNTs were investigated for improving the photovoltaic performance of DSSCs. The MWCNTs were modified through chemical oxidation with sulfuric acid/nitric acid (H2SO4/HNO3) or potassium persulfate/sodium hydroxide (K2S2O8/NaOH). Nanocellulose (CNC) was used as a dispersant to improve the photovoltaic performance and dispersibility as an alternative material for counter electrodes in DSSCs. The counter electrodes were prepared on fluorine-doped tin oxide (FTO) glass substrates by spin coating nanofluids. Morphological and structural investigations were performed using scanning transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) spectroscopy, and Raman spectroscopy. The electrical conductivity and UV light absorption of the DSSCs were analyzed to evaluate their photovoltaic performance. The results of these analyses showed that chemical functionalization and addition of CNC were effective for increasing the electrical conductivity and UV light absorption. Finally, all result trends were the same. Increasing the dispersibility of the counter electrode was found to improve the reduction of I3− at the interface between the MWCNTs and the electrolyte, thereby, improving the energy conversion efficiency.

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Cobalt Sulfide as Counter Electrode in p-Type Dye-Sensitized Solar Cells

Cited by 22 publications

References 30 publications

Silk Cocoon as Counter ‐ Electrode Substrate in Dye ‐ Sensitized Solar Cells

Silk Cocoon as Counter ‐ Electrode Substrate in Dye ‐ Sensitized Solar Cells

Pristine and Al-doped hematite printed films as photoanodes of p-type dye-sensitized solar cells

Photovoltaic Characteristics of Multiwalled Carbon Nanotube Counter-Electrode Materials for Dye-Sensitized Solar Cells Produced by Chemical Treatment and Addition of Dispersant

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