NiO/ZrO2 nanocomposites as photocathodes of tandem DSCs with higher photoconversion efficiency with respect to parent single-photoelectrode p-DSCs

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dc.contributor.authorBonomo, Matteo-
dc.contributor.authorEkoi, Emmanuel J.-
dc.contributor.authorMarrani, Andrea-
dc.contributor.authorDowling, Denis P.-
dc.contributor.authoret al.-
dc.identifier.citationSustainable Energy & Fuelsen_US
dc.description.abstractThe nanocomposites of nickel oxide (NiO) and zirconia (ZrO2) (NZNCs) are particularly effective photocathodic materials in p-type dye-sensitized solar cells (p-DSCs) and tandem DSCs (t-DSCs). The t-DSCs obtained from P1-sensitized NZNC as photocathode and nanostructured titania (TiO2) sensitized with squaraine VG10-C8 as photoanode display overall efficiencies of ca. 2% at their best and, more importantly, produced photocurrents that surpassed systematically the values obtained from the parent devices having one photoelectrochemical interface. Such a finding is a consequence of the diminished resistance of the electrolyte the thickness of which is systematically smaller in t-DSCs with respect to parent DSCs with a single photoelectrochemical junction and same interelectrodic separation. The results here reported demonstrate that a careful combination of photoelectroactive electrodes can lead to an increase in current density of more than 15% in the t-DSC with respect to single-junction DSCs employing the same photoelectrodes provided that the whole thickness of the t-DSC is the same as in the single photoelectrode DSC and the photoelectrodes in the t-DSC do not incur in short-circuit phenomena through the electrolyte. For the successful realization of t-DSCs another important aspect is the complementarity of the absorption properties of the chosen colorants with the sensitized electrodes having similar absorbance in their respective ranges of optical absorption. The latter condition in t-DSCs makes possible the achievement of photoactivity spectra with a uniform efficiency of conversion in the whole visible range. For the attainment of efficient t-DSCs the two different photoelectrodes from parent DSCs (i.e. the devices at a single photoeletrochemical interface), should generate anodic and cathodic photocurrent densities with very similar values. Such a matching of photocurrents requires a careful selection of the thickness values for the photoelectrodes especially in case of materials with considerably different characteristics of charge injection. The approach here considered is a promising one for the assembly of quasi-transparent photoelectrochemical tandem devices operating as smart windows that convert light into electrical power.en_US
dc.description.sponsorshipScience Foundation Irelanden_US
dc.publisherRoyal Society of Chemistryen_US
dc.subjectNanocomposite electrodesen_US
dc.subjectSpray-deposited suspensionsen_US
dc.subjectNickel oxideen_US
dc.titleNiO/ZrO2 nanocomposites as photocathodes of tandem DSCs with higher photoconversion efficiency with respect to parent single-photoelectrode p-DSCsen_US
dc.typeJournal Articleen_US
dc.statusPeer revieweden_US
dc.neeo.contributorEkoi|Emmanuel J.|aut|-
dc.neeo.contributorDowling|Denis P.|aut|-
dc.neeo.contributoret al.||aut|-
dc.description.othersponsorshipThe Italian Ministry for Education, University and Research (MIUR)en_US
dc.description.adminRemove first page of file - RORen_US
dc.identifier.grantidATENEO 2019-
dc.identifier.grantidProt. No. RM11916B756961CA-
item.fulltextWith Fulltext-
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