Evaluación de la actividad catalítica de los electrodos en la REH

En general, el buen rendimiento de un catalizador se caracteriza por presentar altas densidades de corriente de intercambio, así como bajos valores de la pendiente de Tafel [24]. No obstante, la densidad de corriente de intercambio no es un parámetro válido en la evaluación de la actividad catalítica intrínseca, debido a que está relacionada con el área geométrica del electrodo y no con toda la superficie electroquímicamente activa. Por lo tanto, es necesario tomar en cuenta la superficie real del electrodo, la cual se puede determinar conociendo la rugosidad superficial.

Otro parámetro que resulta de importancia es el sobrepotencial a una densidad de corriente aparente específica, el cual provee información del sobrepotencial necesario para producir una determinada cantidad de hidrógeno. Dicho parámetro ha sido ampliamente utilizado en la comparación del rendimiento de electrodos en la REH [34–36,40,57].

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