Synthesis of Ni@PbPt supported on graphene by galvanic displacement reaction for improving ethanol electro-oxidation

Abstract

The high-performance Ni@PbPt electrocatalyst supported on graphene has been synthesized by a galvanic displacement reaction. The method is simple and can be carried out at room temperature without using any capping agents. Transmission electron microscopy reveals that the Ni@PbPt is well distributed with no obvious aggregation. Cyclic voltammetry and chronoamperometry results indicate that the material has higher electrochemical active surface area, electrocatalytic activity, more negative onset oxidative potential and stability for the electro-oxidation of ethanol compared to PtRu and the Ni@PbPt electrocatalyst supported on XC-72 carbon black.

Bimetallic core–shell Ag@Pt nanoparticle-decorated MWNT electrodes for amperometric H2 sensors and direct methanol fuel cells

“…This significant activity enhancement in methanol oxidation is attributed to a high electrochemically active surface area, effective electronic interactions between Pt and Ag due to the ligand and geometric effects [19,20]. The metal-MWNT interactions have been reported to give positive effects on the electrocatalysis [33]. On the other hand, since the anodic peak in the backward scan was related to the removal of CO-like carbonaceous species accumulated on the catalyst surface during the forward scan, the ratio of I f /I b (defined by the ratio of the forward and backward anodic peak current densities) can be utilized to evaluate the CO-tolerance of catalysts [19].…”

“…Since Ag + and PtCl 6 2− continuously diffuse across the shell for the Pt growth, the Pt shell must be porous and the replacement of inner Ag has to be slow. As a result, the GRR is regarded as a simple, excellent approach to the production of core-shell NPs due to its growth characteristics [19,33].…”

Star-like PtCu nanoparticles supported on graphene with superior activity for methanol electro-oxidation

“…3e, g above. (c) The rGO structure has unique electronic properties and the metal-rGO interaction has positive effects on the electrocatalysis [26,[49][50][51][52].…”

Electrocatalytic Oxidation of Ethanol on the Surface of Graphene Based Nanocomposites: An Introduction and Review to it in Recent Studies

“…The rapidly decaying current represented the poisoning of the electrocatalysts, triggered by the intermediates and poisoning species formed throughout the ethanol oxidation reaction. Throughout the whole time, the current density of ethanol oxidation referring to the Ni@PbPt/G composite (curve a in Figure ) was higher and the current density decay was much slower in comparison with those of the other catalysts …”