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Title of Journal: Bull Mater Sci

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Abbravation: Bulletin of Materials Science

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Springer India

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DOI

10.1007/s00401-008-0476-x

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0973-7669

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Cobalt oxide nanoparticlemodified carbon nanotube

Authors: JAHAN BAKHSH RAOOF FERESHTEH CHEKIN VAHID EHSANI
Publish Date: 2015/02/15
Volume: 38, Issue: 1, Pages: 135-140
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Abstract

A simple procedure was developed to prepare cobalt oxide nanoparticles nanoCoOx on multiwall carbon nanotubemodified glassy carbon electrode MWNT/GCE Scanning electron microscopy revealed the electrodeposition of nanoCoOx with an average particle size of 25 nm onto MWNT/GCE Also the presence of nanoCoOx was revealed by energy dispersive Xray spectra The electrocatalytic activity of nanoCoOx and MWNT compositemodified GCE CoOx–MWNT/GCE has been examined towards the oxygen evolution reaction OER by linear sweep voltammetry The OER is significantly enhanced at CoOx–MWNT/GCE as demonstrated by a negative shift in the polarization curves at the CoOx–MWNT/GCE compared with that obtained at the CoOx–GCE and GCE Optimization of the operating experimental conditions ie solution pH and loading level of nanoCoOx has been achieved to maximize the electrocatalytic activity of CoOx–MWNT/GCE The maximum electrocatalytic activity towards the OER was obtained in alkaline media pH = 13 The electrocatalytic activity of CoOx–MWNT/GCE increased with the number of potential cycles employed for the CoOx deposition till a certain loading 20 cycles beyond which an adverse effect is observed The fabricated CoOx–MWNT/GCE exhibited a good stability and durability The value of energy saving per gram of oxygen gas at a current density of 10 mA cm−2 is 19 3 kWh kg−1

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