Abstract
The development of sintered iron electrodes for the NiFe battery is mainly aimed at increasing the discharge capacity and minimising self-discharge. Electrodes were prepared by either introducing additives into the iron powder before sintering or adding to powder before pressing. To evaluate the self-discharge characteristics, electrochemically-impregnated additives were studied by chronopotentiometry to determine the discharge behaviour and open-circuit-potential recovery transients of iron electrodes in the NiFe cell. Mercury and sulphur benefit the iron electrode by increasing the discharge capacity and retarding the formation of FeOOH.
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