NDLI: Ethylene Glycol Oxidation at Pt/TiO$_{2}$/Carbon Hybrid Catalysts Modified Glassy Carbon Electrodes in Alkaline Media

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Ethylene Glycol Oxidation at Pt/TiO$_{2}$/Carbon Hybrid Catalysts Modified Glassy Carbon Electrodes in Alkaline Media

Content Provider	Springer Nature Link
Author	Corchado García, Juan Cabrera, Carlos R.
Copyright Year	2014
Abstract	Biomass-based fuels in conjunction with direct alcohol alkaline fuel cells are an emerging technology that may be able to wean us of our dependency of fossil fuels. However, their adoption is stalled by their high production costs (i.e., precious metal loading) and low electrocatalytic efficiencies. In this study, the platinum loading of 20 % Pt/C catalyst for use in ethylene glycol electrooxidation was reduced by mixing with TiO$_{2}$ nanopowder in different mass ratios. This was followed by surface activation and cyclic voltammograms of the hydrogen adsorption and Pt oxide potential regions in 0.1 M KOH showed peak potential changes that are attributed to platinum interactions with TiO$_{2}$. The catalysts were further tested for the electrochemical oxidation of ethylene glycol in alkaline media, where the titanium-modified catalysts showed a maximum increase in peak current density by 91 %, when compared to the commercial Pt/C catalyst. When the peak current was normalized by Pt surface area and mass, a maximum increase of 322 % was found. Tafel plot analysis showed increased exchange currents for the rate determining step of ethylene glycol oxidation at Pt/TiO$_{2}$/C hybrid catalysts up to 7.35 × 10$^{−7}$A/cm$^{2}$. This is nearly 8.7 times larger than, 8.47 × 10$^{-8}$A/cm$^{2}$, the ethylene glycol exchange current density for the rate determining step in commercial Pt/C catalysts. Finally, chronoamperometric studies showed that the hybrid catalysts possessed increased stability and activity for ethylene glycol electrooxidation in 0.1 M ethylene glycol in 0.1 M KOH at an applied potential of −0.350 V vs. Ag/AgCl. This study shows that TiO$_{2}$ can modify the platinum surface catalyst activity without the need of a TiO$_{2}$ support. This avoids loss in electrical conductivity of the catalyst and lowers the total catalyst mass without sacrificing catalytic mass activity.
Starting Page	402
Ending Page	407
Page Count	6
File Format	PDF
ISSN	18682529
Journal	Electrocatalysis
Volume Number	5
Issue Number	4
e-ISSN	18685994
Language	English
Publisher	Springer US
Publisher Date	2014-05-24
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ethylene glycol Electrocatalysis Pt/TiO$_{2}$ Electrochemistry Physical Chemistry Catalysis Energy Technology
Content Type	Text
Resource Type	Article
Subject	Electrochemistry

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