Abstract
The alkaline iron electrode forms the anode in both nickel-iron and iron-air secondary batteries. The iron electrode reaction in alkaline medium proceeds in two steps. The first step involves conversion of iron metal to Fe(OH)2 which transforms to 6FeOOH during the second step. In the literature [15], several potentiostatic and galvanostatic polarization, as well as rotating disc, measurements have been conducted on the alkaline-iron electrode reaction in these two steps and it has been shown that, while the first step proceeds via a dissolution-precipitation process, the second step involves a solid-state mechanism. In this study we have measured steadystate, open circuit potentials (o.c.p.'s) at various state-of-charge (s.o.c.) values of porous-iron electrodes both with and without sulphide additives and have inferred that these measurements indicate the mechanisms involved during the two discharge steps of the alkaline iron electrode.
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