High-surface-area porous platinum electrodes for enhanced charge transfer

Yelin Hu, Aswani Yella, Stefan Guldin, Marcel Schreier, Francesco Stellacci, Michael Grätzel, Morgan Stefik

Research output: Contribution to journalArticlepeer-review

Abstract

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)BPY3electrolyte 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.

Original languageEnglish
Article number1400510
JournalAdvanced Energy Materials
Volume4
Issue number14
DOIs
Publication statusPublished - Oct 1 2014

Keywords

  • Atomic layer deposition
  • Dye-sensitized solar cells
  • Host-guest architectures
  • Nanomaterials
  • Platinum

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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