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

Author

J. D. Roy-Mayhew, M. A. Pope, C. Punckt, I.A. Aksay

Publication Year

2016

Type

Journal Article

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, k(0), of similar to 6 x 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.

Keywords

Electrocatalysis, materials science, graphene, graphite oxide, sheets, Science & Technology - Other Topics, glassy-carbon electrodes, raman-spectroscopy, dye-sensitized solar cell, catalytic activity, rate constant, heterogeneous electron transfer, cobalt redox mediator, electron-transfer kinetics, functionalized, counter electrodes, electrochemical performance, low-cost, films

Journal

ACS Applied Materials & Interfaces

Volume

Pages

9134-9141

Date Published

04/2016

Type of Article

Article

ISBN

1944-8244

Accession Number

WOS:000374274900033

Short Title

ACS Appl. Mater. InterfacesACS Appl. Mater. Interfaces

Alternate Journal

ACS Appl. Mater. Interfaces

Documents

pu_16_08_roymayhew.pdf

ISI Document Delivery No.: DJ5UFTimes Cited: 3Cited Reference Count: 59Roy-Mayhew, Joseph D. Pope, Michael A. Punckt, Christian Aksay, Ilhan A.Punckt, Christian/A-1845-2011Punckt, Christian/0000-0003-2120-5980; Pope, Michael/0000-0002-5793-3392National Science Foundation Graduate Research Fellowship [DGE-0646086]; Pacific Northwest National Laboratory [66354]We thank P. Lohse (Uppsala University) for supplying the cobalt redox mediator, G. Boschloo and A. Hagfeldt (Uppsala University) for supplying the D35 dye, and J. S. Lettow (Vorbeck Materials Corp.) for supplying FGS48. J.D.R.-M. was supported by a National Science Foundation Graduate Research Fellowship under Grant No. DGE-0646086. This work was supported by the Pacific Northwest National Laboratory (operated for the United States Department of Energy by Battelle) through Battelle Grant No. 66354.323Amer chemical socWashington