“…[16][17][18] In such a PMD, the electron is directly transferred to the catalytic agent, e. g. a hydrogen evolution catalyst, instead to a redox agent, such as I À 3 /I À . [11,13,16,18] Furthermore, apart from just addressing the properties of the DSSCs, hole conducting organic polymers have been put forward as viable alternatives to NiO or other metal oxide materials, as the tuning of the physicochemical properties of polymers is easier [19] than those of NiO.…”