The Relationship between Microstructure and the Thermal Equilibrium Diagram of Au-Co Alloy Electrodeposit

Abstract

An Au-Co alloy with an extensive composition range was electrodeposited from a gold sulfite and cobalt sulfate mixture. The Au-Co alloy electrodeposits were analyzed by XRD and TEM and the relationship between the phase and thermal equilibrium diagrams was investigated. The Au-Co alloy electrodeposits formed a solid solution over an extensive composition range. It was also revealed that the composition of the electrodeposited Au-Co alloy was equal to that of the quenched phase at a high temperature, about 950 C.

Synthesis of MCF-supported AuCo nanoparticle catalysts and the catalytic performance for the CO oxidation reaction

“…Though these features indicated the characteristics of a AuCo intermetallic structure, the intensities of these particular peaks were weak and indicated that only a partially ordered alloy was formed. 27 Thus, the observed small shi in our case suggested that only a small part of the surface Co species has been alloyed with Au nanoparticles. In addition, neither Co nor CoO x phases were detected in the AuCo/MCF catalysts, suggesting that Co might exist as highly dispersed species.…”

Pulsed laser irradiation of colloidal nanoparticles: a new synthesis route for the production of non-equilibrium bimetallic alloy submicrometer spheres

“…Nowadays, the generation of bimetallic alloy particles has been investigated using chemical methods and the milling of powders. [9][10][11][12][13][14][15] However, the use of these methods may lead to contamination of the product as a result of chemical precursors or the abrasion of grinding elements. 16 A laser ablation-in-liquid technique is considered a safe, simple and versatile way to produce nanocrystals and nano-sized oxides.…”

Communication—A Cyanide-Free Electrolyte for Hard Gold (Au-Co) Electrodepositing Utilizing DMH as Complexing Agent

“…They found the structure of Au-Co alloy film were composed of cobalt supersaturated gold solid solution at cobalt content less than approximately 18.0 at.%, and gold supersaturated ε-Co solid solution at cobalt content above approximately 94.0 at.%. 20 Take the non-equilibrium process of electrodepositing into consideration, the diffraction peaks 1), (Au-JCPDS: 04-0784; Cu-JCPDS: 04-0836), respectively. Almost all patterns performed gold lattice, few cobalt diffraction peaks were found, as reported.…”

“…Different electrolyte composition will result in various Au-Co alloy electrodeposits. 19,20 SIII. SEM and a scanner were used to analysis micromorphology and micromorphology of electrodeposits, respectively.…”