Hi,
Faradaic current warning indicates that the reactant concentration is 0 at the wall where reactions occur. This can happen if the current is very large and may lead to divergence. The reaction rates will be concentration dependent only if the rate exponent "gamma_k,r" is set to 1. Please check if this is the case. If it is 0, the faradaic current will be non-zero even though the reactants are not available