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

doi:10.1021/acsami.6b00937

Intrinsic Catalytic Activity of Graphene Defects for the Co^II/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 journal › Article › peer-review

11 Scopus citations

Abstract

We demonstrate that functionalized graphene, rich with lattice defects but lean with oxygen sites, catalyzes the reduction of Co^III(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 language	English (US)
Pages (from-to)	9134-9141
Number of pages	8
Journal	ACS Applied Materials and Interfaces
Volume	8
Issue number	14
DOIs	https://doi.org/10.1021/acsami.6b00937
State	Published - Apr 27 2016

All Science Journal Classification (ASJC) codes

General Materials Science

Keywords

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

Access to Document

10.1021/acsami.6b00937

Cite this

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

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.",

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AU - Aksay, Ilhan A.

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AB - 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.

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KW - cobalt redox mediator

KW - dye-sensitized solar cell

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KW - graphene

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