Reproducible, stable and fast electrochemical activity from easy to make graphene on copper electrodes

Literature Information

Publication Date 2015-09-17
DOI 10.1039/C5CP04070A
Impact Factor 3.676
Authors

Zachary P. L. Laker, Jonathan P. Rourke, Neil R. Wilson


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Abstract

The electrochemical activity of graphene is of fundamental importance to applications from energy storage to sensing, but has proved difficult to unambiguously determine due to the challenges innate to fabricating well defined graphene electrodes free from contamination. Here, we report the electrochemical activity of chemical vapour deposition (CVD) graphene grown on copper foil without further treatment, through appropriate choice of electrolyte. Fast electron transfer kinetics are observed for both inner and outer sphere redox couples with fully covered graphene on copper electrodes (k° = 0.014 ± 0.001 cm s−1 or k° = 0.012 ± 0.001 cm s−1 for potassium ferrocyanide(II) and hexaamineruthenium(III) chloride, respectively). Unlike highly oriented pyrolytic graphite electrodes, the electrochemical response of the graphene on copper electrodes is stable, with no apparent electrode fouling even with inner sphere redox couples, and reproducible independent of the time between growth and measurement. Comparison between fully covered electrodes, and partial coverage of graphene with varying graphene grain sizes (from roughly 50 μm to <10 μm) shows that in this instance the basal plane of graphene is electrochemically active. These CVD grown graphene on copper electrodes are quick, cheap and reproducible to make and hence provide a convenient platform for further investigation of graphene electrochemistry and the effect of covalent and non-covalent modification.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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