Intrinsic Catalytic Activity of Graphene Defects for the CoII/III(bpy)3 Dye-Sensitized Solar Cell Redox Mediator

Joseph D. Roy-Mayhew, Michael A. Pope, Christian Punckt, Ilhan A. Aksay

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

We demonstrate that functionalized graphene, rich with lattice defects but lean with oxygen sites, catalyzes the reduction of CoIII(bpy)3 as well as platinum does, exhibiting a rate of heterogeneous electron transfer, k0, of ∼6 × 10-3 cm/s. We show this rate to be an order of magnitude higher than on oxygen-site-rich graphene oxide, and over 2 orders of magnitude higher than on the basal plane of graphite (as a surrogate for pristine graphene). Furthermore, dye-sensitized solar cells using defect-rich graphene monolayers perform similarly to those using platinum nanoparticles as the catalyst.

Original languageEnglish (US)
Pages (from-to)9134-9141
Number of pages8
JournalACS Applied Materials and Interfaces
Volume8
Issue number14
DOIs
StatePublished - Apr 27 2016

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Keywords

  • catalytic activity
  • cobalt redox mediator
  • dye-sensitized solar cell
  • electrocatalysis
  • graphene
  • heterogeneous electron transfer
  • rate constant

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