| Definition: | current delivered by a fuel cell, at a given voltage, referred to the mass of electrocatalyst in the electrodes Note 1 to entry: The specific activity can also be referred to the electrochemical surface area, or the volume of the catalyst layer. These can be referred to as area specific activity or volume specific activity, respectively. Note 2 to entry: The specific activity is usually expressed in A/g, and can be expressed as A/cm2 or A/cm3.
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