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Contabilidad del comportamiento oxidativo dinámico de los ánodos de níquel

Rodney D L Smith¹, Curtis P Berlinguette¹

¹Departments of Chemistry and Chemical & Biological Engineering, The University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T1Z1, Canada.

Journal of the American Chemical Society

|February 2, 2016

Resumen

Las películas amorfas de níquel oxihidróxido (a-NiOx) se someten a una oxidación de cuatro electrones durante el primer escaneo, formando especies de peróxido de níquel. Este mecanismo explica la catálisis de la reacción de evolución del oxígeno (OER) en los electrodos de níquel.

Área de la Ciencia:

La electroquímica
Ciencias de los materiales

Sus antecedentes:

Las películas amorfas de níquel oxihidróxido (a-NiOx) son cruciales en las aplicaciones electroquímicas.
Comprender su comportamiento dinámico es clave para optimizar los procesos catalíticos.

Objetivo del estudio:

Para investigar el comportamiento de pico anódico de las películas a-NiOx en medios básicos.
Elucidar los procesos de transferencia de electrones y los mecanismos de reacción durante la oxidación.

Principales métodos:

Se utilizó la cronocoulometría para estudiar las películas con concentraciones conocidas de níquel.
Se utilizó la voltametría cíclica para analizar la respuesta electroquímica.

Principales resultados:

Se observó una oxidación de cuatro electrones por sitio de níquel en el pico anódico (1,32 V) durante el escaneo inicial.
Las exploraciones posteriores mostraron señales anódicas y catódicas de dos electrones.
Se detectó una reacción catalítica de evolución del oxígeno (OER) a un potencial más bajo de lo que se suponía anteriormente.

Conclusiones:

Se propone un mecanismo que implica la conversión de hidróxido de níquel (II) en especies de peróxido de níquel.
Este modelo de oxidación de cuatro electrones concilia diversos datos de la literatura sobre la catálisis OER del electrodo de níquel.

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