期刊
ACS APPLIED MATERIALS & INTERFACES
卷 4, 期 12, 页码 6998-7005出版社
AMER CHEMICAL SOC
DOI: 10.1021/am302253e
关键词
graphene oxide; reduced graphene oxide; dye sensitized solar cell; cobalt redox shuttle; electrochemical impedance spectroscopy
资金
- Academy of Sciences of the Czech Republic [IAA 400400804, KAN 200100801]
- project Molesol [256617]
- European Research Council (ERC) [247404]
- Korea Foundation for International Cooperation in Science & Technology through the Global Research Lab
Thin semitransparent films were fabricated on F-doped SnO2 (FTO) from single-layer graphene oxide (GO) either pure or in a composite with graphene nanoplatelets. Electrocatalytic activity of prepared films was tested for the Co(bpy)(3)(3+/2+) redox couple in acetonitrile electrolyte solution. Pristine GO showed almost no activity, resembling the properties of basal plane pyrolytic graphite. However, electrochemical performance of graphene oxide improved dramatically upon chemical reduction with hydrazine and/or heat treatment. All GO-containing films were firmly bonded to FTO, which contrasted with the poor adhesion of sole graphene nanoplatelets to this support. The activity loss during long-term aging was considerably improved, too. Enhanced stability of GO-containing films together with high electrocatalytic activity is beneficial for application in a new generation of dye-sensitized solar cells employing Co(bpy)(3)(3+/2+) as the redox shuttle.
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