Nitrogen-rich two-dimensional porous polybenzimidazole network as a durable metal-free electrocatalyst for a cobalt reduction reaction in organic dye-sensitized solar cells

Heat-treated two-dimensional (2D) holey polybenzimidazole (HPBI) network, a nitrogen enriched network polymer, displayed outstanding electrocatalytic performance with almost “zero” loss of electrochemical stability even after 1000 potential CV cycles, while the Pt decreased to <10% that of a fresh cell for the cobalt reduction reaction (CRR) in dye-sensitized solar cells (DSSCs).148