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Graphene-family nanomaterials assembled with cobalt oxides and cobalt nanoparticles as hybrid supercapacitive electrodes and enzymeless glucose detection platforms

Published online by Cambridge University Press:  27 December 2016

Sanju Gupta*
Affiliation:
Department of Physics and Astronomy and Applied Materials Institute, Western Kentucky University, KY 42101, USA
Sara B. Carrizosa
Affiliation:
Department of Chemistry, Western Kentucky University, KY 42101, USA
Benjamin McDonald
Affiliation:
Department of Geology, Western Kentucky University, KY 42101, USA
Jacek Jasinski
Affiliation:
Department of Chemical Engineering and Conn Center for Renewable Energy Research, University of Louisville, Kentucky, KY 40292, USA
Nicholas Dimakis
Affiliation:
Department of Physics, The University of Texas-Rio Grande Valley, TX 78539, USA
*
a) Address all correspondence to this author. e-mail: sanju.gupta@wku.edu
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Abstract

We report the development of hybrids consisting of supercapacitive graphene oxide (GO), reduced GO (rGO), electrochemically reduced GO (ErGO), multilayer graphene (MLG) decorated with pseudocapacitive nanostructured cobalt oxides (CoO, Co3O4) and nanoparticles (CoNP) via electrodeposition and hydrothermal synthesis facilitating chemically bridged (covalently and electrostatically anchored) interfaces with tunable properties. These hybrid samples showed heterogeneous transport behavior determining diffusion coefficient (4 × 10−8–6 × 10−6 m2/s) following CoO/MLG < Co3O4/MLG < Co3O4/rGOHT < CoO/ErGO, CoNP/MLG and delivering the maximum specific capacitance >550 F/g for Co3O4/ErGO and Co3O4/MLG. We found an ultrahigh sensitivity of 4.57 mA/(mM cm2) and excellent limit of glucose detection <50 nM following Co3O4/rGOHT < CoO/ErGO < CoNP/MLG < Co3O4/MLG. These findings are due to open pore network and topologically multiplexed conductive pathways provided by graphene nanoscaffolds to ensure rapid charge transfer and ion conduction. Density functional theory determined density of states in the vicinity of Fermi level in-turn providing contribution toward electroactivity due to orbital re-hybridization.

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Copyright
Copyright © Materials Research Society 2016 

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