Layered CoS/graphene nanocomposite as high catalytic counter electrodes for quantum dot-sensitized solar cells

• The sandwich structural CoS/graphene sheet electrode was prepared.
• The graphene plays a key role in modifying the nanostructure of the electrode.
• The CoS/GS electrode possesses excellent electrochemical property.
• The quantum dot-sensitized solar cell shows an improved photovoltaic property.

A sandwich structural CoS/graphene sheet (CoS/GS) electrode was prepared by repeating electrophoretic deposition of graphene sheets and deposition of CoS nanoparticles. We found the graphene sheets play a key role in controlling the morphology of the nanostructure. The obtained CoS/graphene nanocomposite counter electrode has a high specific surface area and displays an excellent electrochemical activity toward the polysulfide electrolyte. Consequently, the quantum dot-sensitized solar cell based on CoS/GS counter electrode shows an improved photovoltaic performance.

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