Electrolytes for dye-sensitized solar cells based on interhalogen ionic salts and liquids
2007 (English)In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 46, no 9, 3566-3575 p.Article in journal (Refereed) Published
In this paper, we report on the preparation of interhalogen ionic liquids of the general formula [K+]XY2-, where K+ = 1,3-dialkylimidazolium, 1,2,3-trialkylimidazolium, or N-alkylpyridinium; XY2- = IBr2- or I2Br-. These compounds were characterized in solution and the solid state by NMR, IR, Raman, and mass spectroscopy. The crystal structure of the compound [Me(2)BuIm]IBr2 (7) shows that the IBr2- anion has a linear Br-I-Br structure. Indications of an equilibrium between different forms of XY2- anions in solution are observed. Interhalogen ionic salts and liquids were used as electrolyte components for encapsulated monolithic dye-sensitized solar cells. Overall light-to-electricity conversion efficiencies up to 6.4%, 5.0%, and 2.4% at 1000 W/m(2) were achieved by using electrolytes based on interhalogen ionic salts and gamma-butyrolactone, glutaronitrile, or native ionic liquids as solvents, respectively. Moreover, in terms of stability, the cell performance lost 9-14% of the initial performance after 1000 h illumination at 350 W/m(2).
Place, publisher, year, edition, pages
2007. Vol. 46, no 9, 3566-3575 p.
polymer gel electrolyte, photoelectrochemical cells, molten, polyiodides, conversion, efficiency, halogens, crystal, iodides, power
IdentifiersURN: urn:nbn:se:kth:diva-16571DOI: 10.1021/ic062244bISI: 000245871700020ScopusID: 2-s2.0-34248361610OAI: oai:DiVA.org:kth-16571DiVA: diva2:334613
QC 201005252010-08-052010-08-05Bibliographically approved