Role of sulphide additives on the performance of alkaline iron electrodes

Steady state, galvanostatic and potentiostatic polarisation studies have been used to examine the role of sulphide additives on the performance of porous, alkaline iron electrodes. From a phenomenological analysis of the linear polarisation data of iron electrodes at various states-of-charge values, a criterion to predict the relative values of the energy transfer coefficients is envisaged. The analysis of the data, in the light of depassivation and grain-refinement models, suggests that the incorporation of sulphide enhances the bulk electrode conductivity