TY - JOUR PB - WILEY-V C H VERLAG GMBH A1 - Hu, Y A1 - Yella, A A1 - Guldin, S A1 - Schreier, M A1 - Stellacci, F A1 - Graetzel, M A1 - Stefik, M JF - Advanced Energy Materials VL - 4 N1 - This version is the author accepted manuscript. For information on re-use, please refer to the publisher?s terms and conditions. UR - https://doi.org/10.1002/aenm.201400510 ID - discovery10125077 EP - 8 N2 - Cobalt-based electrolytes are highly tunable and have pushed the limits of dye-sensitized solar cells, enabling higher open-circuit voltages and new record efficiencies. However, the performance of these electrolytes and a range of other electrolytes suffer from slow electron transfer at platinum counter electrodes. High surface area platinum would enhance catalysis, but pure platinum structures are too expensive in practice. Here, a material-efficient host-guest architecture is developed that uses an ultrathin layer of platinum deposited upon an electrically conductive scaffold, niobium-doped tin oxide (NTO). This nanostructured composite enhances the counter electrode performance of dye-sensitized solar cells (DSCs) using a Co(II/III)BPY3 electrolyte with an increased fill factor and power conversion efficiency (11.26%), compared to analogous flat films. The modular strategy is elaborated by integrating a light scattering layer onto the counter electrode to reflect unabsorbed light back to the photoanode to improve the short-circuit current density and power conversion efficiency. IS - 14 AV - public Y1 - 2014/10/07/ TI - High-Surface-Area Porous Platinum Electrodes for Enhanced Charge Transfer ER -