Abstract
Cathodes comprised of Fe(VI) salts, and capable of three-electron reduction, are useful for the formation of energetic super-iron batteries. Several solid phase modifiers can significantly impact the electrochemical characteristics of the Fe(VI) cathode. The average discharge potential of the super-iron alkaline battery may be increased by ∼150 mV by addition of a few percent by weight of solid Co(III) salts, such as Co 2O 3. This potential may be decreased by ∼200 mV, through manganate or permanganate coating of the Fe(VI) particles with small amounts (for example, 1%) of MnO 2. Evidence indicates that the modifier effects are electrocatalytic in origin. The addition of In, such as In 2O 3, to the cathode improves (decreases) the reversible charging potential of the Fe(VI) cathode and improves the cycle life of the super-iron metal hydride battery.
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