NDLI: Electrochemical synthesis of Au–MnO<sub>2</sub> on electrophoretically prepared graphene nanocomposite for high performance supercapacitor and biosensor applications

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Electrochemical synthesis of Au–MnO₂ on electrophoretically prepared graphene nanocomposite for high performance supercapacitor and biosensor applications

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Inside back cover

Back cover

Journal of Materials Chemistry A Vol - 4 Issue - 8

Journal of Materials Chemistry A Vol - 4 Issue - 7

Journal of Materials Chemistry A Vol - 4 Issue - 6

Journal of Materials Chemistry A Vol - 4 Issue - 5

Journal of Materials Chemistry A Vol -3

Journal of Materials Chemistry A Vol -2

Journal of Materials Chemistry A Vol -1

Electrochemical synthesis of Au–MnO₂ on electrophoretically prepared graphene nanocomposite for high performance supercapacitor and biosensor applications

Content Provider	Royal Society of Chemistry (RSC)
Author	Veeramani, Vediyappan Dinesh, Bose Saraswathi, Ramiah Chen, Shen-Ming
Copyright Year	2016
Abstract	Herein, we report a facile electrochemical synthesis of an Au–MnO2 nanocomposite highly dispersed on an electrophoretically prepared graphene surface for the first time. Fascinatingly, we obtained a nanowires-like morphology for the MnO2 by using a simple in situ electrochemical deposition method. The as-synthesized Au–MnO2–graphene nanocomposite is characterized by various analytical and spectroscopic techniques viz. SEM, EDX, TEM, XRD, Raman spectroscopy and XPS. The as-prepared nanocomposite is employed in an electrochemical supercapacitor and for the sensitive detection of epinephrine. The supercapacitor performance is evaluated in 0.5 M NaOH by both cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) methods. The MnO2 : Au ratio during deposition plays a vital role to influence the capacitance properties. The highest specific capacitance of 575 F g−1 for 1 : 0.01 (MnO2 : Au) at a current density of 2.5 A g−1 has been obtained. The effect of current density, MnO2 : Au ratio, scan rate, mass loading and electrolyte concentration were also optimized and good cycle stability was demonstrated. The comparison of specific capacitance over MnO2–graphene and Au–MnO2–graphene nanocomposites suggests that the incorporation of Au nanoparticles on MnO2–graphene surfaces has a highly substantial effect for enhancement of capacitive behaviour. Furthermore, the epinephrine sensor performance of an Au–MnO2–graphene nanocomposite modified glassy carbon electrode is evaluated by CV and differential pulse voltammetry (DPV) techniques. Interestingly, the DPV sensor exhibited a very low detection limit of 24 nM and an excellent current sensitivity value of 35.6 μA μM−1 cm−2, surpassing several related modified electrodes and demonstrating several practical industrial applications.
Starting Page	3304
Ending Page	3315
Page Count	12
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	4
Issue Number	9
Journal	Journal of Materials Chemistry A
DOI	10.1039/c5ta10515c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Raman Electrochemistry Nanocomposite Graphene Transmission electron microscopy X-ray crystallography Raman spectroscopy Supercapacitor Epinephrine Cyclic voltammetry Capacitance Electric current Electrolyte Carbon Electrode Differential pulse voltammetry
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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