Template electrosynthesis of La(OH)3 and Nd(OH)3 nanowires using porous anodic alumina membranes

Abstract

High quality arrays of Ln(OH) 3 (Ln = La, Nd) nanowires have been successfully fabricated for the first time by an electrochemical process using anodic alumina membrane templates. A physico-chemical characterisation of electrodeposited hydroxides has been carried out by different techniques (XRD, SEM and EDX). The results show that the synthesized nanostructures are crystalline, dense, continuous, well aligned, and with high aspect ratio, suggesting further development of possible applications in the lanthanide family species.

From ceria nanotubes to nanowires through electrogeneration of base

“…Oxide can be directly produced via electrogeneration of base from properly selected organic solvent or indirectly by thermal treating the corresponding hydroxide. This technique has been recently adapted as a soft electrochemical route to the preparation of nanotubes/nanowires metal hydroxides and/or oxides through the employment of a template [5][6][7][8][9]. The deposition of metal hydroxides involves two steps at the cathode/electrolyte interface: the cathodic generation of hydroxyl ions and the chemical precipitation of the hydroxide.…”

Room temperature electrodeposition of photoactive Cd(OH)2 nanowires

“…In the case of Cd, the reduction of Cd 2+ ions to metallic Cd has a standard equilibrium potential higher with respect to the other metals whose hydroxides have been precipitated into AAMs [7,9,10]. Thus, the reduction process involving Cd 2+ can completely suppress the OH -generation from H 2 O reduction, as reported in…”

“…Recently, template-assisted electrochemical synthesis has been shown to be a versatile, simple and low temperature approach for the preparation of metals oxide/hydroxide nanostructures [6][7][8][9][10]. The deposition usually occurs through a mechanism of electroprecipitation, according to which base is generated at the cathode/ electrolyte interface, where the hydroxide reaches its solubility product owing to the local increase of pH [11,12].…”

Electrochemical Synthesis of Rare Earth Ceramic Oxide Coatings

“…However, lanthanum hydroxide, La(OH) 3 , has been electrochemically deposited. Bocchetta et al first showed that it was possible to obtain La(OH) 3 from a solution of lanthanum nitrate using galvanostatic deposition at a cathodic current of 1 mA/cm 2 [40]. They obtained nanowires on an Al substrate, and the authors proposed that deposition occurred through a base generation mechanism.…”

“…There are only a few papers reporting the attempt to electrodeposit lanthanum oxides from aqueous solutions [39][40][41][42]. In practice, La 2 O 3 has not been deposited directly using electrodeposition.…”