Abstract
The chemistry of the Fe(VI) compound, K 2 FeO 4 , was investigated in aqueous potassium hydroxide electrolyte for its potential use in secondary storage systems. High charge storage K 2 FeO 4 material was synthesized using alkaline hypochlorite oxidation of ferric nitrate and characterized hy in situ X-ray diffraction and Mossbauer spectroscopy. The discharge-charge profile of the cathode, measured vs. a zine anode, was semiquantitatively correlated with changes in Fe 6 + /F3 3 + ratio and the nature of structural transformation at each stage by in situ Mossbauer and in situ synchrotron X-ray diffraction spectroscopy. The data in conjunction with the charge-discharge profile clearly indicates the rechargeability of K 2 FeO 4 with a charge efficiency of about 36% of the total current passed under the prevailing experimental conditions. These results are potentially important to the design of Fe 6 + compound analogs for use in secondary energy storage systems.
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