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

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• 作者：Joseph D. Roy-Mayhew ; Michael A. Pope ; Christian Punckt ; Ilhan A. Aksay
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：April 13, 2016
• 年：2016
• 卷：8
• 期：14
• 页码：9134-9141
• 全文大小：428K
• 年卷期：0
• ISSN：1944-8252

文摘

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.