Pd–Ni electrocatalysts for efficient ethanol oxidation reaction in alkaline electrolyte

Electrochemical behavior of electrodeposited Pd and PdNi coatings for the ethanol oxidation reaction in alkaline solution

“…The results of the Tafel polarization study corroborate the findings of CV. Nearly the same values of Tafel plots were obtained on graphene supported NiPd binary catalysts [6], binary composite films of Pd and Ni on multiwalled carbon nanotubes (MWCNT) [36], carbon supported PdNi nanoparticles [35,37] and rather higher on PdNi nanoparticles supported on sulfonated MWCNT [38]. Figure 6 shows the CVs obtained at Pd 0.74 Ni 0.26 catalyst in 1 M NaOH +1.0 M C 2 H 5 OH solution at different scan rates.…”

“…It can be pointed out that improved catalytic activity of investigated binary coatings can be achieved through the optimization of the Ni content and appropriate surface morphology. Considering the literature, it can be stated that the best ratio of Pd and Ni for the EOR vary, depending on several factors as was explained in [29] whereby excess Ni decrease the activity for EOR due to the active surface blocking [6,35]. It can be found that carbon supported PdNi catalyst with atomic ratio of 40:60 synthesized by the simultaneous reduction method using NaBH 4 as reductant exhibits 2 times higher activity and better stability than does the Pd/C catalyst [34].…”

“…It can be found that carbon supported PdNi catalyst with atomic ratio of 40:60 synthesized by the simultaneous reduction method using NaBH 4 as reductant exhibits 2 times higher activity and better stability than does the Pd/C catalyst [34]. Also the optimized carbon supported PdNi catalyst synthesized through a modified solution phase-based nanocapsule method, with atomic ratio of 44:56 represents the promising anode catalyst for alkaline DEFCs giving 180 mV more negative EOR onset potential and the 33 times higher exchange current density than Pd/C [35]. Graphene supported PdNi catalyst prepared by chemical reduction method, with atomic ratio of 50:50 showed the lower onset potential on CV and better long-term stability on amperometric measurements of EOR in a series of investigated binary alloyed Ni x Pd 100-x /G catalysts [6].…”

Palladium–nickel materials as cathode electrocatalysts for alkaline fuel cells

“…The low intensity of these signals indicates a relatively low crystallinity degree. Previous works in the literature observed that as a consequence of the nickel presence, the particle size decreases and thus, the amount of crystalline facets [31]. Moreover, the presence of crystalline -Ni(OH)2 was evidenced from the peak located at ~20º, which corresponds to the reflection of the (001) facet for this specie [32].…”

Preparation and Electrocatalytic Characteristics of PdW/C Catalyst for Ethanol Oxidation

“…It is noted that they all exhibit significantly high anodic and cathodic current densities. The oxidation peak at lower anodic potential during the forward scan is ascribed to the formation of the adsorbed hydroxyl OHads while the peaks at high positive potential are related to the formation of Pd oxides [31,32]. The potential region from −1.1 to −0.6 V versus SCE on the CV curve of the catalyst is associated with the hydrogen adsorption/desorption.…”