Lithium salt-nonionic surfactant lyotropic liquid crystalline gel-electrolytes with redox couple for dye sensitized solar cells

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dc.citation.epage97437en_US
dc.citation.issueNumber99en_US
dc.citation.spage97430en_US
dc.citation.volumeNumber6en_US
dc.contributor.authorYılmaz, E.en_US
dc.contributor.authorOlutaş, E. B.en_US
dc.contributor.authorBarım, G.en_US
dc.contributor.authorBandara, J.en_US
dc.contributor.authorDag, Ö.en_US
dc.date.accessioned2018-04-12T10:48:00Z
dc.date.available2018-04-12T10:48:00Z
dc.date.issued2016en_US
dc.departmentDepartment of Chemistryen_US
dc.description.abstractLithium salt (LiCl, LiBr, LiI, or LiNO3) and a non-ionic surfactant (such as 10-lauryl ether, C12E10) form lyotropic liquid crystalline (LLC) mesophases in the presence of a small amount of water. The mesophases can be prepared as gels by mixing all the ingredients in one pot or in the solution phase that they can be prepared by coating over any substrate where the LLC phase is formed by evaporating excess solvent. The second method is easier and produces the same mesophase as the first method. A typical composition of the LLC phases consists of 2-3 water per salt species depending on the counter anion. The LiI-C12E10 mesophases can also be prepared by adding I2 to the media to introduce an I-/I3 - redox couple that may be used as a gel-electrolyte in a dye-sensitized solar cell. Even though the mesophases contain a large amount of water in the media, this does not affect the cell performance. The water molecules in the mesophase are in the hydration sphere of the ions and do not act like bulk water, which is harmful to the anode of the dye-sensitized solar cells (DSSC). There are two major drawbacks of the salt-surfactant LLC mesophases in the DSSCs; one is the diffusion of the gels into the pores of the anode electrode and the other is the low ionic conductivity. The first issue was partially overcome by introducing the gel content as a solution and the gelation was carried in/over the pores of the dye modified titania films. To increase the ionic conductivity of the gels, other salts (such as LiCl, LiBr, and LiNO3) with better ionic conductivity were added to the media, however, those gels behave less effectively than pure LiI/I2 systems. Overall, the DSSCs constructed using the LLC electrolyte display high short circuit current (Isc of around 10 mA), high open circuit voltage (Voc of 0.81 V) and good fill factor (0.69) and good efficiency (3.3%). There is still room for improvement in addressing the above issues in order to enhance the cell efficiency by developing new methods of introducing the gel-electrolytes into the mesopores of the anode electrode.en_US
dc.description.provenanceMade available in DSpace on 2018-04-12T10:48:00Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 179475 bytes, checksum: ea0bedeb05ac9ccfb983c327e155f0c2 (MD5) Previous issue date: 2016en
dc.identifier.doi10.1039/c6ra19979hen_US
dc.identifier.issn2046-2069
dc.identifier.urihttp://hdl.handle.net/11693/36673
dc.language.isoEnglishen_US
dc.publisherRoyal Society of Chemistryen_US
dc.relation.isversionofhttp://dx.doi.org/10.1039/c6ra19979hen_US
dc.source.titleRSC Advancesen_US
dc.subjectAnodesen_US
dc.subjectCrystalline materialsen_US
dc.subjectEfficiencyen_US
dc.subjectElectrodesen_US
dc.subjectElectrolytesen_US
dc.subjectGelationen_US
dc.subjectGelsen_US
dc.subjectIonic conductivityen_US
dc.subjectMoleculesen_US
dc.subjectNonionic surfactantsen_US
dc.subjectOpen circuit voltageen_US
dc.subjectSolar cellsen_US
dc.subjectSolid electrolytesen_US
dc.subjectSurface active agentsen_US
dc.subjectAnode electrodesen_US
dc.subjectCell efficiencyen_US
dc.subjectCell performanceen_US
dc.subjectGel electrolyteen_US
dc.subjectLyotropic liquid crystallineen_US
dc.subjectModified titaniaen_US
dc.subjectSolution phaseen_US
dc.subjectWater moleculeen_US
dc.subjectDye-sensitized solar cellsen_US
dc.titleLithium salt-nonionic surfactant lyotropic liquid crystalline gel-electrolytes with redox couple for dye sensitized solar cellsen_US
dc.typeArticleen_US

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