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High Surface Area Porous Platinum Electrodes for Enhanced Charge Transfer

Publikationsart Peer-reviewed
Publikationsform Originalbeitrag (peer-reviewed)
Autor/in Yelin Hu Aswani Yella Stefan Guldin Francesco Stellacci Michael Grätzel Morgan Stefik
Projekt Defects in the bulk and on surfaces and interfaces of metal oxides with photoelectrochemical properties: In-situ photoelectrochemical and resonant x-ray and electron spectroscopy studies
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Originalbeitrag (peer-reviewed)

Zeitschrift Advanced Energy Materials
Status Angenommen
DOI DOI: 10.1002/aenm.201400510

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 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, we develop a material-efficient host-guest architecture that uses an ultrathin layer of platinum deposited upon an electrically conductive scaffold: niobium doped tin oxide (NTO). This nanostructured composite enhanced the counter electrode performance of DSCs using a Co(II/III)BPY3 electrolyte with an increased fill factor and power conversion efficiency (11.26%), as compared to analogous flat films. Our modular strategy was 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.