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Author(s): Rui Cruz
Lúcia Brandão
Adélio Mendes
Title: Use of single wall nanohorns as counter electrodes in dye sensitized solar cells
Issue Date: 2013
Abstract: The catalytic activity of single-wall carbon nanohorns (SWNH) as counter electrodes (CE) of dye-sensitized solar cells(DSC) was studied for the iodide/triiodide redox reaction. The catalytic activities of SWNH and high surface SWNH(HS-SWNH) obtained by partial oxidation of SWNH were assessed based on charge-transfer resistances (Rct) andcurrentvoltage curves. A half-cell configuration was used, and CE performances were compared to CEs made ofcarbon black (CB) and Pt. A CE assembled with HS-SWNH and mixed with 10 wt.% of hydroxyethyl cellulose (HEC) -HS-SWNH/HEC was found to have the highest electrocatalytic activity (lowest Rct) among all the carbon-based CEs testedwhen annealed at 180 C (Rct = 141 cm2); however, a very thick film (several tens of mm) would be required in order toperform comparably to a Pt CE. The annealing of such CE at higher temperatures (above 400 C) did not improve itscatalytic activity, contrary to the other studied carbonaceous CEs.The redox catalytic activity of SWNH and HS-SWNH decorated with Pt was also studied on a half-cell configuration andcompared to that of Pt/CB and pristine Pt. The Pt/SWNH/HEC CE showed the highest electrocatalytic activity per mass ofPt, needing just 50% of Pt load to yield the same electrocatalytic activity of a DSC equipped with a Pt CE, but having halfof its transparency. Additionally, applications in temperature-sensitive substrates are envisioned for the Pt/SWNH/HEC CEdue to the use of lower annealing temperatures.
Subject: Engenharia química
Chemical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia química
Engineering and technology::Chemical engineering
Related Information: info:eu-repo/grantAgreement/Agência de Inovação, S.A./Projectos de I&DT em Co-Promoção/SI IDT - 3423/2008/Desenvolvimento de um sistema inovador de selagem e montagem de DSC/SolarSel
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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