An electrochemical study of the cobalt electrodeposition onto a carbon fiber ultramicroelectrode

• Autores: Jair A. Corona-Castro, Giaan Arturo Alvarez Romero, Margarita Rivera Hernandez, C.H. Rios Reyes, L.E. Bañuelos-García, Ernesto García Sánchez, L.H. Mendoza Huizar
• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 67, Nº. 2, 2022, págs. 5500-5502
• Idioma: inglés
• Enlaces
  • Texto completo
• Resumen

  • A kinetic study of the cobalt electrodeposition onto a carbon fiber ultramicroelectrode of 11 μm of diameter was conducted in overpotential conditions from an aqueous solution containing 0.01 M CoCl2 + 0.1 M NH4Cl. From the voltamperometric and chronoamperometric studies, it was found that the value of the diffusion coefficient is 1.2x10−5 cm2 s−1. The analysis of the current density transients suggests that cobalt electrodeposition onto a carbon fiber electrode follows an instantaneous nucleation process controlled by spherical diffusion mass transport. Also, the number of active nucleation sites increases as the applied potential decreases.