Glycerol Electrooxidation in Alkaline Medium Using Pd/C, Au/C and PdAu/C Electrocatalysts Prepared by Electron Beam Irradiation

Binary and ternary palladium based electrocatalysts for alkaline direct glycerol fuel cell

“…6 provided two major observations: (i) the power densities were higher in the ternary electrocatalysts; (ii) the addition of only one co-catalyst to Pd/C is not efficient for glycerol electro-oxidation. In previous research, Geraldes et al [30] studied binary electrocatalysts (PdAu in different atomic ratios) for glycerol oxidation reaction and observed that the large amount of gold as co-catalyst is not efficient (50 or 70 parts of Au). The highest power densities were 34, 33, 29 and 25 mW cm À2 , obtained with Pd/C, PdAu/C 90:10, PdAu/C 50:50 and PdAu/C30:70 MEAs, respectively.…”

“…These results showed that the addition of Au and/or Sn to Pd/C electrocatalyst provides a beneficial effect on the performance in the whole potential range. The best performance of the binary or ternary electrocatalysts may be attributed to the bifunctional mechanism where Pd species are available for glycerol adsorption and Au and/or Sn provide oxygen species for the oxidation of the intermediates [30]. The electrocatalysts prepared were tested for 30 min to evaluate the electrocatalysts activity, stability and tolerance to poisoning by intermediate species.…”

“…Experiments on a single alkaline direct ethanol fuel cell (ADEFC) were conducted between 50 and 90 C, and the best performance of 44 mW cm À2 in 2.0 mol L À1 ethanol was obtained at 85 C for Pd:Au with Pd:Au atomic ratio 90:10 electrocatalyst. Geraldes et al [30] also studied the glycerol electro-oxidation in single alkaline direct glycerol fuel cell (ADGFC). Cyclic voltammetry (CV) and chronoamperometry showed that PdAu/C electrocatalyst with Pd:Au atomic ratio of 50:50 indicated superior activity for glycerol electro-oxidation at room temperature.…”

“…PtAuBi/C (50:40:10) indicated a superior performance for ethanol electro-oxidation in alkaline medium [28]. Geraldes et al [29,30] prepared carbon-supported Pd, Au and bimetallic PdAu (Pd:Au 90:10, 50:50 and 30:70 atomic ratios) electrocatalysts using electron beam irradiation for ethanol and glycerol electrooxidation. In ethanol electro-oxidation [29], chronoamperometry (CA) experiments, at room temperature, demonstrated that PdAu/C electrocatalysts with Pd:Au ratios of 90:10 and 50:50, presented superior activity.…”

Direct Glycerol Fuel Cells: Comparison with Direct Methanol and Ethanol Fuel Cells

“…[1][2][3][4][5][6][7][8][9] Among all alcohols, direct methanol (DMFC) and ethanol (DEFC) fuel cells have been studied extensively due to their high theoretical energy density of 4.8 and 6.4 kWh L À 1 , respectively. It has a high energy density of 6.26 kWh À l , [4,8,10] non-toxic, non-flammable, with low -volatility. [6] One promising alternative alcohol fuel candidate is glycerol.…”