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

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

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

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

URI: http://hdl.handle.net/2263/31898

Date: 2013-03

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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