NDLI: Study of electrode processes and deposition of cobalt thin films from ionic liquid analogues based on choline chloride

Content Provider	Springer Nature Link
Author	Cojocaru, Anca Mares, Mariana Lili Prioteasa, Paula Anicai, Liana Visan, Teodor
Copyright Year	2014
Abstract	The cathodic processes of cobalt ion in ionic liquids consisting in binary mixtures of choline chloride (ChCl) with urea, ethylene glycol, malonic acid or oxalic acid were investigated using cyclic voltammetry and electrochemical impedance spectroscopy. The as-received hexahydrate cobalt chloride has been the precursor of cobalt ionic species. It was found that the reduction mechanism of Co2+ in ChCl-urea and ChCl-ethylene glycol is a quasi-reversible (or with high degree of irreversibility at high scan rate) and diffusion controlled process, whereas in ChCl-carboxilic acid solvents the cathodic process of Co2+ is overlapped with reduction of protons. By using Pt and vitreous carbon electrodes, one has computed the value for the Co2+ diffusion coefficient in ChCl-urea at 80 °C; in comparison with values obtained in aqueous solutions, this is up to two orders of magnitude lower. The paper also describes preliminary experiments concerning electrodeposition of cobalt thin films on copper substrate from the four ionic liquid analogue solvents containing choline chloride. The crystalline morphology and structural constitution of Co deposits were examined by scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. Good results regarding the quality and cobalt content in films were obtained for Co deposits using ChCl-urea or ChCl-ethylene glycol mixtures as solvents. The behaviour of Co films grown from these media was typical for a ferromagnetic material.
Starting Page	1001
Ending Page	1014
Page Count	14
File Format	PDF
ISSN	14328488
Journal	Journal of Solid State Electrochemistry
Volume Number	19
Issue Number	4
e-ISSN	14330768
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-12-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electrodeposition Cobalt thin film Ionic liquid analogue Choline chloride Magnetism Physical Chemistry Electrochemistry Energy Storage Characterization and Evaluation of Materials Analytical Chemistry Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science Electrical and Electronic Engineering Electrochemistry

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