Premlatha, S. and Sivasakthi, P. and Ramesh Bapu, G.N.K. (2017) Synthesis of Co-CeO2 nanoflake arrays and their application to highlysensitive and selective electrochemical sensing of hydrazine. Journal of Electroanalytical Chemistry, 788. pp. 107-117. ISSN 1572-6657

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A highly sensitive hydrazine sensor was successfully fabricated based on Co-CeO2 modified nanocomposites by employing a simple, cost effective and versatile electrodeposition technique. The surfacemorphology and the elemental composition were examined from SEM, FESEM and EDAX analysis. The oxidation states of Co and CeO2 nanoparticleswere characterized using XPS. The crystallite structure and the preferred orientationwere analyzed with XRD patterns. FESEMimages showed the hierarchical cobalt nanoflakes morphology inwhich the spherical shaped CeO2 nanoparticleswere embedded over the electrode surface. The electrochemical determination of hydrazine was characterized using cyclic voltammetry and chronoamperometric methods. Interestingly, compared with pure Co, themodified Co-CeO2 electrodeminimizes the overpotential at 0.28 V and largely enhances the oxidation peak current (2.6 mA) for hydrazine electro-oxidation. Amperometric experiments for hydrazine exhibited two linear ranges from0.005mMto 0.1mMand from0.13mMto 0.37mM. In particular the detection limits obtained for the Co-CeO2 modified electrodes were 6 and 12 nm respectively. The extreme sensitivity and selectivity of the proposed senor material could be due to the porous nature of the material. The analytical parameters revealed that Co-CeO2 nanocomposites are the promising electrocatalyst for hydrazine sensing

Item Type: Article
Uncontrolled Keywords: Electrodeposition;Co-CeO2;Electrocatalyst;Hydrazine electrooxidation;Chronoamperometry
Subjects: Electrodeposition
Electrodics and Electrocatalysis
Depositing User: Dr. N Meyyappan
Date Deposited: 15 May 2019 10:08
Last Modified: 15 May 2019 10:08

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