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Appl. Sci. 2017, 7(1), 64; doi:10.3390/app7010064

High Electrocatalytic Performance of CuCoNi@CNTs Modified Glassy Carbon Electrode towards Methanol Oxidation in Alkaline Medium

1
Materials Science and Technology Program, College of Arts and Science, Qatar University, Doha 2713, Qatar
2
Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt
3
Center for Advanced Materials, Qatar University, Doha 2713, Qatar
*
Authors to whom correspondence should be addressed.
Academic Editor: Jiazhao Wang
Received: 4 November 2016 / Revised: 26 December 2016 / Accepted: 4 January 2017 / Published: 10 January 2017
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Abstract

A novel non-precious multiwalled carbon nanotubes (CNTs)—supported metal oxide electrocatalyst was developed for methanol electrooxidation in alkaline medium. The catalyst was fabricated by simultaneous electrodeposition of copper-cobalt-nickel ternary nanostructures (CuCoNi) on a glassy carbon electrode (GCE) modified with CNTs. The proposed electrode was characterized using X-ray diffraction (XRD), energy dispersive X-ray (EDX), and scanning electron microscopy (SEM). The electrochemical behavior and the electrocatalytic performance of the suggested electrode towards the oxidation of methanol were evaluated by cyclic voltammetry (CV), linear sweep voltammetry (LSV), and chronoamperometry (CA) in alkaline medium. Several parameters were investigated, e.g., deposition time, potential scan rate, etc. Compared to Cu, Co, or Ni mono electrocatalysts, the electrode based on ternary-metals exhibited superior electrocatalytic activity and stability towards methanol electrooxidation. For instance, CuCoNi@CNTs/GCE has shown at least 2.5 times electrocatalytic activity and stability compared to the mono eletrocatalysts. Moreover, the present study found that the optimized loading level is 1500 s of simultaneous electrodeposition. At this loading level, it was found that the relation between the Ip1/2 function and scan rate gives the characteristic features of a catalytic process. The enhanced activity and stability of CuCoNi@CNTs/GCE was attributed to (i) a synergism between three metal oxides coexisting in the same structure; (ii) the presence of CNTs as a support for the metal oxides, that offers high surface area for the deposited tertiary alloy and suppresses the aggregation and sintering of the metals oxide with time; as well as (iii) the increase of the conductivity of the deposited semiconducting metal oxides. View Full-Text
Keywords: methanol; oxidation; CNTs; Cu-Co-Ni nanostructure; electrocatalysis methanol; oxidation; CNTs; Cu-Co-Ni nanostructure; electrocatalysis
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Hamza, A.A.; El-Refaei, S.M.; Elzatahry, A.A.; Abdullah, A.M. High Electrocatalytic Performance of CuCoNi@CNTs Modified Glassy Carbon Electrode towards Methanol Oxidation in Alkaline Medium. Appl. Sci. 2017, 7, 64.

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