Journal
SOLAR ENERGY
Volume 86, Issue 2, Pages 716-724Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2011.11.010
Keywords
Dye-sensitized solar cell; Graphene oxide; Transparent counter-electrode; Annealing; Thermal reduction
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Funding
- Portuguese Foundation for Science and Technology (FCT)
- Efacec - Engenharia e Sistemas S.A [SFRH/BDE/33439/ 2008]
- European Regional Development Fund [3423/2008]
- Portuguese Government through ADI - Agencia de Inovacao
- Portuguese Government under QREN Initiative
- Fundação para a Ciência e a Tecnologia [SFRH/BDE/33439/2008] Funding Source: FCT
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Stand-alone graphene-based films were prepared from graphcne oxide (GO) nanoplatelets and their use as counter-electrodes (CEs) in dye-sensitized solar cells (DSCs) was investigated. The graphene-based CEs were produced by spray deposition of GO and chemically reduced GO, followed by thermal annealing under an inert atmosphere. These GO-based CEs were shown to have similar transparency as a reference CE made of Pt. Consistent with impedance data from symmetrical half-cells, DSCs assembled with such GO-based CEs exhibited relative efficiencies of ca. 75% comparatively to the reference Pt CE. The possibility of obtaining transparent (transmittance higher than 80%) and reasonable catalytic films for DSCs (energy conversion efficiency of 2.64%) from GO nanoplatelets was demonstrated. The need for reduction of the graphene oxide nanoplatelets prior to deposition was not observed, allowing for a simplified CE manufacturing process. However, further work is still needed to equal or surpass the performance of Pt CEs. (C) 2011 Elsevier Ltd. All rights reserved.
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