Palladium-Based Nanocatalysts for Alcohol Electrooxidation in Alkaline Media

Modibedi, Remegia M.; Ozoemena, Kenneth I.; Mathe, Mkhulu

doi:10.1007/978-1-4471-4911-8_6

Cited by 10 publications

(10 citation statements)

References 82 publications

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“…Fundamental studies on the electrooxidation of aliphatic alcohols carried out in the aqueous phase have shown also an activity trend of methanol>ethanol>iso-propanol [37,52,53]. Based on literature, as the number of C-atoms in the alcohol increases, the overall kinetics of alcohol electrooxidation become slower, due to the formation of strongly adsorbed intermediates and to the need for breaking the C-C bond [57][58][59]. These features will be discussed in section 3.3 of the present manuscript.…”

Section: Deconvolution Of the Overpotential Componentsmentioning

confidence: 99%

Hydrogen from electrochemical reforming of C1–C3 alcohols using proton conducting membranes

Sapountzi

Tsampas

Fredriksson

et al. 2017

International Journal of Hydrogen Energy

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This study investigates the production of hydrogen from the electrochemical reforming of short-chain alcohols (methanol, ethanol, iso-propanol) and their mixtures. High surface gas diffusion Pt/C electrodes were interfaced to a Nafion polymeric membrane. The assembly separated the two chambers of an electrochemical reactor, which were filled with anolyte (alcohol+H2O or alcohol+H2SO4) and catholyte (H2SO4) aqueous solutions. The half-reactions, which take place upon polarization, are the alcohol electrooxidation and the hydrogen evolution reaction at the anode and cathode, respectively. A standard Ag/AgCl reference electrode was introduced for monitoring the individual anodic and cathodic overpotentials. Our results show that roughly 75% of the total potential losses are due to sluggish kinetics of the alcohol electrooxidation reaction. Anodic overpotential becomes larger as the number of C-atoms in the alcohol increases, while a slight dependence on the pH was observed upon changing the acidity of the anolyte solution. In the case of alcohol mixtures, it is the largest alcohol that dictates the overall cell performance.

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Section: Deconvolution Of the Overpotential Componentsmentioning

confidence: 99%

Hydrogen from electrochemical reforming of C1–C3 alcohols using proton conducting membranes

Sapountzi

Tsampas

Fredriksson

et al. 2017

International Journal of Hydrogen Energy

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“…Palladium (Pd)-based catalysts are attracting major attention as the most viable materials for ADAFCs. [13][14][15][16] The interest in Pd stems from its natural abundance and low-cost compared to Pt (Pd currently sells at half the price of Pt), [17][18][19][20][21][22][23] and enhanced electrochemical kinetics in alkaline media and ADAFCs than Pt catalysts.…”

Section: Introductionmentioning

confidence: 99%

Electro-oxidation of ethylene glycol and glycerol at palladium-decorated FeCo@Fe core–shell nanocatalysts for alkaline direct alcohol fuel cells: functionalized MWCNT supports and impact on product selectivity

et al. 2015

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“…electrolysis of iso-propanol shows high anodic overpotentials at both acidic and alkaline polymeric electrolytes, suggesting that iso-propanol electrolysis is not a viable technology under the tested conditions. We assume that the high anodic overpotentials obtained with iso-propanol are mainly related to the formation of strongly adsorbed intermediates [44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60] .…”

Section: Acidic Vs Alkaline Membranesmentioning

confidence: 99%

Overpotential analysis of alkaline and acidic alcohol electrolysers and optimized membrane-electrode assemblies

Sapountzi¹,

Palma

Zafeiropoulos

et al. 2019

International Journal of Hydrogen Energy

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Alcohol electrolysis using polymeric membrane electrolytes is a promising route for storing excess renewable energy in hydrogen, alternative to the thermodynamically limited water electrolysis. By properly choosing the ionic agent (i.e. H + or OH-) and the catalyst support, and by tuning the catalyst structure, we developed membrane-electrode-assemblies which are suitable for cost-effective and efficient alcohol electrolysis. Novel porous electrodes were prepared by Atomic Layer Deposition (ALD) of Pt on a TiO2-Ti web of microfibers and were interfaced to polymeric membranes with either H + or OHconductivity. Our results suggest that alcohol electrolysis is more efficient using OHconducting membranes under appropriate operation conditions (high pH in anolyte solution). ALD enables better catalyst utilization while it appears that the TiO2-Ti substrate is an ideal alternative to the conventional carbon-based diffusion layers, due to its open structure. Overall, by using our developmental anodes instead of commercial porous electrodes, the performance of the alcohol electrolyser (normalized per mass of Pt) can be increased up to ∼30 times.

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Palladium-Based Nanocatalysts for Alcohol Electrooxidation in Alkaline Media

Cited by 10 publications

References 82 publications

Hydrogen from electrochemical reforming of C1–C3 alcohols using proton conducting membranes

Hydrogen from electrochemical reforming of C1–C3 alcohols using proton conducting membranes

Electro-oxidation of ethylene glycol and glycerol at palladium-decorated FeCo@Fe core–shell nanocatalysts for alkaline direct alcohol fuel cells: functionalized MWCNT supports and impact on product selectivity

Overpotential analysis of alkaline and acidic alcohol electrolysers and optimized membrane-electrode assemblies

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