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Development of high efficiency 100% aqueous cobalt electrolyte dye-sensitised solar cells
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. (Boschloo)
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. (Boschloo)
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. (Boschloo)
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. Ecole Polytech Fed Lausanne, Lab Photomol Sci, Inst Chem Sci & Engn, EPFL FSB ISIC LSPM,Stn 6, CH-1015 Lausanne, Switzerland.; King Abdulaziz Univ, Ctr Excellence Adv Mat Res, Jeddah 215889, Saudi Arabia. (Boschloo)
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2016 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 18, no 12, p. 8419-8427Article in journal (Refereed) Published
Abstract [en]

In this study we report the application of three cobalt redox shuttles in 100% aqueous electrolyte dye-sensitised solar cells (DSCs). By using chloride as a counter-ion for cobalt bipyridine, cobalt phenanthroline and cobalt bipyridine pyrazole, the redox shuttles were made water soluble; no surfactant or further treatment was necessary. A simple system of merely the redox shuttles and 1-methylbenzimidazole (MBI) in water as an electrolyte in combination with an organic dye and a mesoporous PEDOT counter electrode was optimised. The optimisation resulted in an average efficiency of 5.5% (record efficiency of 5.7%) at 1 sun. The results of this study present promising routes for further improvements of aqueous cobalt electrolyte DSCs.

Place, publisher, year, edition, pages
2016. Vol. 18, no 12, p. 8419-8427
Keywords [en]
Dye, solar cell, water, electrolyte, titanium dioxide
National Category
Physical Chemistry
Research subject
Chemistry with specialization in Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-280289DOI: 10.1039/C6CP00264AISI: 000372249100012PubMedID: 26931779OAI: oai:DiVA.org:uu-280289DiVA, id: diva2:910470
Available from: 2016-03-09 Created: 2016-03-09 Last updated: 2018-08-16Bibliographically approved
In thesis
1. Developing Environmentally Friendly Dye-sensitized Solar Cells
Open this publication in new window or tab >>Developing Environmentally Friendly Dye-sensitized Solar Cells
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Due to climate change and its effects, alternative renewable energy sources are needed in the future human society. In the work of this thesis, the Dye-sensitized Solar Cell (DSC) has been investigated and characterized.

DSCs are appealing as energy conversion devices, since they have high potential to provide low cost solar light to electricity conversion. The DSC is built up by a working electrode consisting of a conductive glass substrate with a dye-sensitized mesoporous TiO2 film, a counter electrode with a catalyst and, in between, the electrolyte which performs the charge transport by means of a redox mediator. The aim of this thesis was to develop and evaluate cheap and environmentally friendly materials for the DSC.

An alternative polymer-based counter electrode catalyst was fabricated and evaluated, showing that the PEDOT catalyst counter electrode outperformed the platinum catalyst counter electrode. Different organic dyes were evaluated and it was found that the dye architecture affected the performance of the assembled DSCs. A partly hydrophilic organic triphenylamine dye was developed and applied in water-based electrolyte DSCs. The partly hydrophilic dye outperformed the reference hydrophobic dye. Small changes in dye architecture were evaluated for two similar dyes, both by spectroscopic and electrochemical techniques. A change in the length of the dialkoxyphenyl units on a triphenylamine dye, affected the recombination and the regeneration electron transfer kinetics in the DSC system. Finally, three water soluble cobalt redox couples were developed and applied in water-based electrolyte DSCs. An average efficiency of 5.5% (record efficiency of 5.7%) for a 100% water-based electrolyte DSC was achieved with the polymer-based catalyst counter electrode and an organic dye with short dimethoxyphenyl units, improving the wetting and the regeneration process.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. p. 82
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1351
Keywords
dye-sensitized solar cells, dye, cobalt, triphenylamine, titanium dioxide, aqueous, PEDOT
National Category
Physical Chemistry
Research subject
Chemistry with specialization in Physical Chemistry
Identifiers
urn:nbn:se:uu:diva-280291 (URN)978-91-554-9506-0 (ISBN)
Public defence
2016-04-29, Polhemsalen; Ång/10134, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Opponent
Supervisors
Available from: 2016-04-06 Created: 2016-03-09 Last updated: 2016-05-24
2. Overcoming the Mass Transport Limitations of Dye-Sensitised Solar Cells: Towards highly efficient and robust alternative redox mediator electrolyte DSSCs
Open this publication in new window or tab >>Overcoming the Mass Transport Limitations of Dye-Sensitised Solar Cells: Towards highly efficient and robust alternative redox mediator electrolyte DSSCs
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Dye-sensitised solar cells (DSSCs) have been subject to decadelong research interest, and may have some potential niche market applications. Recently, major advances in power conversion efficiencies have been achieved following the transition to cobalt polypyridine based redox mediators. Unfortunately, these champion devices remained unfeasible for commercialisation due to heavy reliance on flammable volatile acetonitrile electrolytes. Overcoming this issue has been a challenge due to increased mass transport limitations, which are especially exacerbated in more stable albeit viscous electrolytes. The overall aim of this thesis is to better understand the contributing factors to mass transport, and then to develop practical solutions to overcome these limitations. In particular, specific mass transport limitations pertaining to the bulk electrolyte medium and electrolyte-infiltrated TiO2 medium, are investigated. The effect of non-uniform photogeneration profile across the photoanode is explored with respect to mass transport using photocurrent transient techniques. Practical devices engineering for optimal mass transport is explored in terms of minimising the inter-electrode spacing and maximising light absorption towards the electrolyte-electrode side. Alternative devices based on more practical electrolytes with higher viscosity are optimised for high efficiency.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 65
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1705
Keywords
Dye-sensitised solar cell, dye-sensitized solar cell, photoelectrochemical cell, cobalt tris(bipyridine), mass transport, photocurrent transients
National Category
Physical Chemistry
Identifiers
urn:nbn:se:uu:diva-357399 (URN)978-91-513-0408-3 (ISBN)
Public defence
2018-10-05, Room 2001, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2018-09-11 Created: 2018-08-16 Last updated: 2018-10-02

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Ellis, HannaJiang, RogerHagfeldt, AndersBoschloo, Gerrit

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