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 language | English (US) |
---|---|
Pages (from-to) | 9134-9141 |
Number of pages | 8 |
Journal | ACS Applied Materials and Interfaces |
Volume | 8 |
Issue number | 14 |
DOIs | |
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