Electrocatalytic activity of bimetallic Pd Au nanostructure supported on nanoporous stainless steel surface using galvanic replacement reaction toward the glycerol oxidation in alkaline media

Glycerol Electro-Oxidation in Alkaline Media and Alkaline Direct Glycerol Fuel Cells

“…Finally, Au has a very high degree of resistance to the formation of poisoning oxides such as CO [38]. For these reasons and to enhance the GOR activity and short term electrochemical stability, the effect of Au addition to Pt [20,29,[39][40][41][42] and Pd [18,40,[43][44][45][46][47][48][49][50] catalysts on their electrochemical properties in alkaline media was investigated. The GOR activity, in terms of both onset potential and peak current density, and the poisoning tolerance of all PtAu and PdAu catalysts was higher than that of bare Pt and Pd, as can be seen in Table 1.…”

“…25 Au%, while for the data from Zhou et al [20] the maximum was at 65 Au%. The higher GOR activity of Au-containing catalysts than pure metals was ascribed mainly to the bifunctional effect [20,40,41,[43][44][45]48,50] but also to electronic effects [29,39,41,[47][48][49][50] and the higher electrochemically active surface area (ECSA) [39,40]. According to Mougenot et al [43], the PdAu surface alloy composition has a negligible effect on the catalytic activity, but the improvement of the GOR activity is due to the presence of non-alloyed gold sites on the catalyst surface, where GLY is adsorbed on Pd atoms and OH-species are adsorbed on Au atoms, allowing the oxidation of GLY oxidation intermediate species at low potentials by the bifunctional mechanism.…”

Electrochemical Deposition of PdBiSn Catalyst for Glycerol Oxidation in Alkaline Medium

“…Glycerol is a major by product from biodiesel production, making the use of glycerol in DAFC a more environmentally clean process [5,6]. The notable merits of using glycerol in DAFC are that it is non-toxic, less flammable and volatile, and most importantly because of its high theoretical volumetric energy density (6.4 KWh L À 1 ) [5,6]. The challenge is the removal of poisonous intermediates at low over-potentials, as these intermediates decreases the total efficiency of the system.…”

“…Studies have shown that Pd catalysts have high activity in alkaline media than in acidic environment [7,8]. Further studies have also shown that the addition of a co-catalytic element or promoter to Pd can enhance oxidation of alcohols [5,[8][9][10][11]. Zalineeva and co-workers [12] reported the use of Bi modified Pd nanoparticles synthesised using a colloidal method.…”

“…The types of alcohols used include methanol, ethanol, ethylene glycol and glycerol. Glycerol is a major by product from biodiesel production, making the use of glycerol in DAFC a more environmentally clean process [5, 6]. The notable merits of using glycerol in DAFC are that it is non‐toxic, less flammable and volatile, and most importantly because of its high theoretical volumetric energy density (6.4 KWh L −1 ) [5, 6].…”