Potentiostatic Electrodeposition Method Research Articles

Composite of Pt–Ru supported SnO 2 nanowires grown on carbon paper for electrocatalytic oxidation of methanol

Platinum–ruthenium (Pt–Ru) nanoparticles were successfully deposited, for the first time, on the surface of SnO 2 nanowires grown directly on carbon paper (Pt–Ru/SnO 2 NWs/carbon paper) by potentiostatic electrodeposition method. The resultant Pt–Ru/SnO 2 NWs/carbon paper composites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The electrocatalytic activities of these composite electrodes for methanol oxidation were investigated and higher mass and specific activities in methanol oxidation were exhibited as compared to Pt–Ru catalysts deposited on glassy carbon electrode.

Electrochemical deposition and characterization of Ni–P alloy thin films

Nickel phosphorus (Ni–P) alloy thin films were prepared by electrodeposition on pre-cleaned copper substrates using a potentiostatic cathodic electrodeposition method from sulfate electrolyte baths at various sodium hypophosphite (NaH 2PO 2) concentrations. X-ray diffraction studies reveal polycrystalline cubic alloys at low concentrations of phosphorus (< 13.5 at.%) and these transformed into amorphous alloys at higher concentrations. X-ray photoelectron spectra show the presence of Ni 2p and P 2p lines corresponding to their binding energies. Scanning electron microscopic studies reveal spherical shaped grains at low phosphorus contents and modules of cauliflower type morphology at higher phosphorus concentrations. The effects of phosphorus concentration on the crystal structure, composition and morphology are studied and discussed.

Recovery of heavy metals from spent Ni–Cd batteries by a potentiostatic electrodeposition technique

Two heavy metals, Cd and Ni, have been separately recovered from spent AA-size Ni–Cd batteries by the potentiostatic electrodeposition and chemical precipitation methods, respectively. Various types and concentrations of HCl, H 2SO 4, and HNO 3 acids had been used as leach extractants. Experimental results indicate that the acid with the best leach capability is 4 M HCl. Three complexing reagents of NH 3, sodium acetate, sodium citrate have been chosen and tested. The most effective buffer is sodium citrate. The optimum mole ratio of metallic ion to citrate ion is 1:1. The recovery process for Cd metal is conducted by the potentiostatic electrodeposition in a leach electrolyte with a sodium citrate complex. The optimum applied potential for Cd recovery is in the range −1100 to −1120 mV (versus saturated calomel electrode (SCE)). The current efficiency for the recovery process is between 70 and 90% and depends strongly on the process parameters, e.g. liquor, concentration, applied potential, temperature, type of complex reagents, mole ratio, mass-transfer rate.

Structural and chemical properties of ZnSe-Fe electrodeposited granular films

Potentiostatic electrodeposition methods have been used to grow polycrystalline ZnSe and ZnSe-Fe granular thin films on stainless steel substrates from aqueous solutions. These films were characterized by x-ray diffraction, transmission electron microscopy, x-ray photoelectron spectroscopy and Raman spectroscopy.