Researchers from Michigan Technological University developed a new "3D Graphene" material that can be used to replace platinum used in dye-sensitized solar cells (DSSC). The new material is cheap and easy to make, and using it as an electrode the researcher fabricated a DSSC sell that has an energy efficiency of 7.8% (conventional platinum-electrode based solar cell achieve 8%):

http://www.graphene-info.com/easy-make-3d-graphene-can-efficiently-replace-platinum-dye-sensitized-solar-cells