Intrinsic Catalytic Activity of Graphene Defects for the CoII/III(bpy)3 Dye-Sensitized Solar Cell Redox Mediator
| Autor: | Joseph D. Roy-Mayhew, Christian Punckt, Michael A. Pope, Ilhan A. Aksay |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Graphene Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Platinum nanoparticles Photochemistry Electrocatalyst 01 natural sciences 0104 chemical sciences Catalysis law.invention Dye-sensitized solar cell Electron transfer chemistry law Monolayer General Materials Science 0210 nano-technology Platinum |
| Zdroj: | ACS Applied Materials & Interfaces. 8:9134-9141 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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