Electrocatalytic oxidation of ethylene glycol at palladium-bimetallic nanocatalysts (PdSn and PdNi) supported on sulfonate-functionalised multi-walled carbon nanotubes

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Authors

Ramulifho, Tendamudzimu
Ozoemena, Kenneth I.
Modibedi, Remegia M.
Jafta, Charl Jeremy
Mathe, Mkhulu K.

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Publisher

Elsevier

Abstract

Electrocatalytic oxidation of ethylene glycol (EG) in alkaline medium using nano-scaled palladium-based bimetallic catalysts (PdM, where M = Ni and Sn) supported on sulfonated multi-walled carbon nanotubes (SF-MWCNTs) is compared. The bimetallic mixture (i.e., SF-MWCNT–PdSnmix and SF-MWCNT–PdNimix) showed better electrocatalysis towards EG oxidation than the SF-MWCNT–Pd. At the SF-MWCNT– PdSnmix platform, oxidation of EG occurred at lower onset and peak potentials, higher current density, and faster kinetics (lower impedance) than at the SF-MWCNT–PdNimix platform. EG oxidation at the SF-MWCNT–PdNimix is more stable than at the SF-MWCNT–PdSnmix. Indeed, Sn is a more favoured cocatalyst with Pd in EG electro-oxidation.

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Keywords

Ethylene glycol, Electro-oxidation, Bimetallic catalysts, PdSn nanocatalyst

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Citation

Ramulifho, T, Ozoemena, KI, Modibedi, RM, Jafta, CJ, Mathe, MK 2013, 'Electrocatalytic oxidation of ethylene glycol at palladium-bimetallic nanocatalysts (PdSn and PdNi) supported on sulfonate-functionalised multi-walled carbon nanotubes', Journal of Electroanalytical Chemistry, vol. 692, pp. 26-30.