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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5693

Title: Fast microwave-assisted solvothermal synthesis of metal nanoparticles (Pd, Ni, Sn) supported on sulfonated MWCNTs: Pd-based bimetallic catalysts for ethanol oxidation in alkaline medium
Authors: Ramulifho, T
Ozoemena, KI
Modibedi, RM
Jafta, CJ
Mathe, MK
Keywords: Microwave synthesis
Ethanol oxidation
Sulfonated carbon nanotubes
Pd–M nanoparticle catalysts
Voltammetry
Issue Date: Jan-2012
Publisher: Elsevier
Citation: Ramulifho, T, Ozoemena, KI, Modibedi, RM, Jafta, CJ and Mathe, MK. 2012. Fast microwave-assisted solvothermal synthesis of metal nanoparticles (Pd, Ni, Sn) supported on sulfonated MWCNTs: Pd-based bimetallic catalysts for ethanol oxidation in alkaline medium. Electrochimica Acta, vol. 59, pp. 310-320
Series/Report no.: Workflow;8596
Abstract: The preparation of metal nanoparticles (Pd, Ni, Sn) supported on sulfonated multi-walled carbon nanotubes (SF-MWCNTs) using a very rapid microwave-assisted solvothermal strategy has been described. Electrocatalytic behaviour of the SF-MWCNT-Pd and its "mixed" bimetallic electrocatalysts (i.e., SF-MWCNT-PdSn mix and SF-MWCNT-PdNi) towards ethanol oxidation in alkaline medium was investigated. The result shows that the mixed Pd-based catalysts (obtained by simple ultrasonic-mixing of the individual MWCNT-metal nanocomposites) gave better electrocatalytic activity than their alloy nanoparticles (obtained by co-reduction of metal salts) or Pd alone. The SF-MWCNT platform gave better electrocatalytic performance compared to the unsulfonated and commercial Vulcan carbons. Detailed electrochemical studies (involving cyclic voltammetry, chronoamperometry, chronopotentiometry, and impedance spectroscopy) prove that the mix electrocatalytic oxidation of ethanol at the platform is more stable, ours at lower potential, gives lower Tafel slopes, with faster charge-transfer kinetics compared to its SF-MWCNT-PdSn mix SF-MWCNT-PdNi counterpart. Also, result revealed that SF-MWCNT-PdNi is more tolerant to CO poisoning than the SF-MWCNT-PdSn. The results provide some important insights into the electrochemical response of microwave-synthesised Pd-based bimetallic catalysts for potential application in direct ethanol alkaline fuel cell technology.
Description: Copyright: 2011 Elsevier. This is a post-print version of the work. The definitive version is published in Electrochimica Acta, vol. 59, pp 310-320
URI: http://www.sciencedirect.com/science/article/pii/S0013468611016239
http://hdl.handle.net/10204/5693
ISSN: 0013-4686
Appears in Collections:Sustainability science
Sustainable energy futures
Nanotechnology
CSIR ScienceScope
Analytical science
General science, engineering & technology
General research interest

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