Browsing by Autor "Jair A. Corona-Castro"

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    A Kinetic Study of Silver Electrodeposition Onto Pt Ultramicroelectrodes From Amoniacal Solutions
    (Croatian Chemical Society, 2020) Jair A. Corona-Castro; Giaan Arturo Álvarez‐Romero; Margarita Rivera; José M. Sausedo-Solorio; Clara Hilda Rios-Reyes; Luis Humberto Mendoza-Huízar
    A kinetic study of the Ag electrodeposition onto Pt ultramicroelectrodes of 10, 15 and 25 m of diameter from an aqueous solution containing AgNO3 1 mM + NH4NO3 0.1 M was conducted at overpotential conditions through potentiostatic studies. The analysis of the current density transients indicates the existence of two 2D nucleation and growth processes previous to the 3D nucleation and growth process.
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    AN ELECTROCHEMICAL STUDY OF THE COBALT ELECTRODEPOSITION ONTO A CARBON FIBER ULTRAMICROELECTRODE
    (Sociedad Chilena de Química, 2022) Jair A. Corona-Castro; Giaan Arturo Álvarez‐Romero; Margarita Rivera; Clara Hilda Rios-Reyes; L.E. Bañuelos-García; Eduardo García Sánchez; Luis Humberto Mendoza-Huízar
    A kinetic study of the cobalt electrodeposition onto a carbon fiber ultramicroelectrode of 11 m 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 cm 2 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.