Development of Pt-Co catalysts supported on carbon nanotubes using the polyol method—tuning the conditions for optimum properties |
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Authors: | E Zagoraiou N Shroti MK Daletou |
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Institution: | Foundation of Research and Technology, Hellas—Institute of Chemical Engineering Sciences, FORTH/ICEHT, Stadiou Str, Platani Rion, P.O. Box 1414, Patras GR-26504, Greece |
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Abstract: | Pt alloys with transition metals supported on carbon substrates are used as improved cathode electrocatalysts for fuel cells. Enhanced catalytic activity is attributed to the structure (Pt-Pt bond distance) and/or electronic effect (Pt d-electron vacancy). This work focuses on the development of Pt3Co/f-MWCNT catalysts (functionalized multiwalled carbon nanotubes f-MWCNT]) using ethylene glycol as the dispersing and reducing agent. The aim is to in parallel achieve fine dispersion, quantitative deposition and alloy formation. As described herein, the pH value of the reaction suspension has a critical effect on the composition and morphology of the synthesized nanoparticles. High pH values favor the formation of Pt3Co alloy, nevertheless negatively influencing the dispersion. A discussion is made on the reduction/deposition mechanism and how to control the conditions to result in optimum properties. |
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Keywords: | Platinum-Cobalt alloy Multiwwalled Carbon nanotubes Functionalized nanotubes Reduction/deposition mechanism |
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