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Graphene nanoplatelets (GNPs) functionalised with platinum were explored as the active material in a high specific surface area ink. The ink had a transmission at 550nm (T550) = 85% and a charge transfer resistance (Rct) of 6Ω/cm2. Although the Rct is higher than required for laboratory cells having a Jsc of 20mA/cm2 under 1 sun test conditions it is sufficient for industrially produced reverse devices, especially when utilised for indoor applications where light conditions will be lower than 100W/m2. This was demonstrated by reverse illuminated DSC efficiencies with flexible cathodes which were equivalent to cells with sputtered platinum catalysts when subjected to 300W/m2 lighting or less. A modification to the ink, suitable for catalysing a Co2+/3+ electrolyte having an Rct of 2Ω/cm2 and T550= 85% was undertaken. This demonstrates potential for use in high efficiency cobalt mediated DSCs. The work shows that printed graphene catalysts are a versatile low cost replacement to sputtered platinum in reverse illuminated DSCs for dye sensitised solar cells.
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