Graphene/Polyaniline Nanocomposite Multilayer Counter Electrode by Inserted Polyaniline of Dye-Sensitized Solar Cells

Polyaniline (PANI) conducting polymer and graphene are preferred counter electrode (CE) materials for dye-sensitized solar cells (DSSC). Graphene/PANI nanocomposite multilayer CE is created through the insertion of a PANI layer. It has been demonstrated as a platinum-free counter electrode for cost-efficient DSSCs. Here, graphene/PANI nanocomposite and PANI were synthesized by electro-polymerization from a solution containing aniline monomers and graphene. Graphene/PANI nanocomposite multilayer CE showed improved electrical conductivity, interface charge transfer rate, and catalytic activity on I₃^? reduction compared with the Pt CE. The high electro-catalytic ability of graphene/PANI nanocomposite multilayer CE was demonstrated by cyclic voltammetry and electrochemical impedance spectroscopy.