One step electrochemical synthesis of bimetallic PdAu supported on nafion–graphene ribbon film for ethanol electrooxidation

Codeposition of Palladium and Gold on Nickel Wire Electrodes via Galvanic Replacement Reactions for Ethanol Oxidation

“…Figure A indicates that the CV responses and the increased current magnitude recorded with the present PdAu-deposited Ni wire electrode are similar to those recorded with the Pd electrode (Figure ), but dissimilar to those recorded with the Au-deposited Ni wire electrodes (Figure ). While the electrocatalytic oxidation of ethanol as shown in Figure have been reported with Au electrocatalysts, − the CVs reported for ethanol oxidation with PdAu systems until now − were similar to those recorded with Pd electrocatalysts. Thus, the present result shown in Figure A could be termed as “usual” for the codeposited PdAu.…”

“…To our best knowledge, chemical reductions using reducing reagents have been carried out for preparing PdAu electrocatalysts, − except in one work . Our approach is based on pure galvanic replacement reactions without any reducing reagents and additives, so that the codeposition of PdAu on Ni wire that has shown the above results is discussed on the basis of redox potentials.…”

“…In this decade, carbon-supported PdAu nanocatalysts for ethanol oxidation have been extensively studied, in particular, using Vulcan XC72 carbon as a supporting material. − Although there are various preparation methods, the catalysts were prepared in principle by coreduction or codeposition from the precursor ions of Pd and Au in aqueous solutions using reducing reagents. Recent attention has expanded to the preparation with other supporting materials, such as graphene ribbons, reduced graphene oxides, nitrided carbon, carbon nanotubes, and layered double hydroxides . Also, the coreduction approach has permitted the preparation of unsupported PdAu nanocatalysts, such as PdAu hexoctahedral, PdAu@Pd core–shell nanoflowers, PdAu networks, snowflakelike PdAu nanostructures, and PdAu nanowire networks .…”

Anchoring ternary CuFePd nanocatalysts on reduced graphene oxide to improve the electrocatalytic activity for the methanol oxidation reaction

“…This clearly demonstrates enhanced catalytic activity on the CuFePd/rGO, because the presence of dopant Cu and Fe not only increased the utilization efficiency, but also decreased the d-band center of Pd and thereby altered the electronic properties of the overall catalyst. [16][17][18][19][20][21]53 As a result, the coverage of CO-like carbonaceous species on the Pd surface was reduced, making more active sites available for MOR; this resulted from the diminished affinity toward CO due to the presence of defect sites at the interconnects between Pd and the dopant Cu/Fe segments. 53 The onset potential of CuFePd/rGO was more negative than those of the others, showing that methanol is easier to oxidize on the ternary alloyed catalyst.…”

“…One approach to improve the performance is tuning of the electronic structures of Pd by forming bimetallic structures with a second noble metal such as Ru, Au and Rh. [16][17][18][19][20] Most promisingly, combining Pd with non-noble metals could not only improve the catalytic activity but also reduce the cost of the catalysts. For example, Ni@Pd core-shell nanoparticles supported on multi-walled carbon nanotubes exhibit high electrocatalytic activity and stability compared to its pure Pd counterpart.…”