Electrochemical studies of metallic chromium electrodeposition from a Cr(III) bath

Autor:	António F. Silva, Elisabete S. C. Ferreira, Carlos M. Pereira
Rok vydání:	2013
Předmět:	Chemistry General Chemical Engineering Inorganic chemistry Nucleation chemistry.chemical_element Chronoamperometry Electrochemistry Analytical Chemistry Metal chemistry.chemical_compound Chromium visual_art Ionic liquid visual_art.visual_art_medium Cyclic voltammetry Choline chloride
Zdroj:	Journal of Electroanalytical Chemistry. 707:52-58
ISSN:	1572-6657
DOI:	10.1016/j.jelechem.2013.08.005
Popis:	In this work we describe the electrochemical behavior of an ionic liquid formed between choline chloride (ChCl) and chromium chloride hexahidrated (CrCl3⋅6H2O) in the ratio of 2.5:1 containing 20 wt.% of added ultrapure water, using cyclic voltammetry and chronoamperometry. The reduction of Cr(III) occurs in two steps, Cr(III) to Cr(II) and Cr(II) to Cr(0), respectively. The first step is controlled by diffusion. For the first time a thorough study of the nucleation of chromium from Cr(III) ionic liquid solutions is described. Furthermore for less cathodic potentials there is a diffusion control of nuclei growth. For more cathodic potentials the lattice incorporation of adatoms to the growing nuclei is the limiting process. The additive free bright chromium deposit obtained is formed by semi-spherical nuclei. The effect of hydrogen evolution is only observed for E
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2bfbcad7c3cf6420c1dfe4f3c8325700 https://doi.org/10.1016/j.jelechem.2013.08.005 Zobrazit plný text záznamu Full Text from ScienceDirect