COBALT-INDIUM ALLOYS ELECTRODEPOSITION FROM CITRATE ELECTROLYTE AND SPATIO-TEMPORAL PATTERNS FORMATION

  • L. Veleva Center for Investigation and Advanced Studies (CINVESTAV-IPN)
  • M.A. Estrella-Gutiérrez Institute of Physical Chemistry, Bulgarian Academy of Sciences
  • Ts. Dobrovolska Institute of Physical Chemistry, Bulgarian Academy of Sciences
  • I. Krastev Institute of Physical Chemistry, Bulgarian Academy of Sciences
Keywords: electrodeposition, cobalt-indium alloy, cyclic voltammetry, spatio-temporal patterns, XRD, SEM-EDX

Abstract

Cyclic voltammetry technique was used to compare the mechanism of the deposition of In, Co and Co-In from citrate electrolytes. Samples of Co-In coatings were electrodeposited at different current densities to permit the subsequent investigation of their physicochemical characteristics. It was established a strong relation between CoIn phase composition and the electrolysis conditions. At low current densities below the limiting current only In was deposited. At higher current the alloy phase of CoIn3 was formed, besides that of In, and minority phases were Co and Co(OH)2. At higher current densities of about 0.8-1.5 A/dm2, when intensive hydrogen evolution was observed, specific patterns (spirals, waves, targets) were visible onto the Co-In coating surfaces, considered as spatio-temporal structures. The pattern formation could be promoted by the specific hydrodynamic conditions close to the cathode-electrolyte interface and by the concentration fluctuation of the ionic species

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Published
2020-03-19
How to Cite
Veleva, L., Estrella-Gutiérrez, M., Dobrovolska, T., & Krastev, I. (2020). COBALT-INDIUM ALLOYS ELECTRODEPOSITION FROM CITRATE ELECTROLYTE AND SPATIO-TEMPORAL PATTERNS FORMATION. Revista Mexicana De Ingeniería Química, 12(2), 345-350. Retrieved from http://www.rmiq.org/ojs311/index.php/rmiq/article/view/1478
Section
Materials