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Investigation of cobalt redox mediators and effects of TiO2 film topology in dye-sensitized solar cells
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry. Uppsala University, Sweden.
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2016 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 6, no 61, 56580-56588 p.Article in journal (Refereed) PublishedText
Abstract [en]

One-electron outer-sphere redox couples, such as cobalt metal-organic complexes, represent an interesting alternative as redox mediators in dye-sensitized solar cells since they show weak visible light absorption and available redox potentials may lead to higher open circuit voltage values. Here, we have studied the effect of using different substituents on bipyridyl and phenanthroline ligands in cobalt redox shuttles, giving the following complexes: Co[tris(4,4'-dimethoxy-2,2'-bipyridine)(PF6)(2)], Co[tris(4,4'-dichloro-2,2'-bipyridine)(PF6)(2)] and Co[tris(4,7-dichloro-1,10-phenanthroline)(CF3SO3)(2)], displaying a range of CoII/CoIII redox potentials from +0.37 to +0.79 V vs. NHE. The regeneration kinetics of the organic dye D35 was found to depend systematically on the redox mediator potential, which was explained using Marcus theory. The mass transport of cobalt mediators in dye-sensitized solar cells is highly dependent on the porosity, effective surface area and roughness of the mesoporous TiO2 films. Therefore, films with different TiO2 pore sizes were prepared and investigated to gain an insight into the topological effects of TiO2 film preparation in order to obtain optimum solar cell performance.

Place, publisher, year, edition, pages
2016. Vol. 6, no 61, 56580-56588 p.
Keyword [en]
Cobalt, Cobalt compounds, Electromagnetic wave absorption, Film preparation, Light absorption, Open circuit voltage, Organometallics, Pore size, Redox reactions, Solar cells, Titanium dioxide, Topology, Cobalt redox mediators, Effective surface area, Metal-organic complexes, Redox mediators, Redox potentials, Solar cell performance, Topological effects, Visible light absorption
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-189838DOI: 10.1039/c6ra07107dISI: 000378275400108ScopusID: 2-s2.0-84975038095OAI: oai:DiVA.org:kth-189838DiVA: diva2:949257
Funder
Swedish Energy AgencySwedish Research CouncilStandUp
Note

QC 20160718

Available from: 2016-07-18 Created: 2016-07-15 Last updated: 2016-07-18Bibliographically approved

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Safdari, MajidHögberg, DanielRutland, MarkAsencio, Ruben AlvarezGardner, JamesKloo, Lars
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