The Electrochemical Behavior of Positive Cobalt/Aluminum and Cobalt/Iron Hydroxide Electrodes

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Abstract
Doping with M3+ (Al3+, Fe3+) ions by coprecipitation of the nitrate or sulfate salts at leads to compounds in which the usual electrochemical inertness of is overcome. Products of molar ratio have the highest charge capacity. They crystallize in the double layer structure of the pyroaurite type, consisting of Co/M hydroxide cations , and anion interlayers . The pyroaurite structure favors the formation of various hydrogen bonds. These hydrogen bonds facilitate both the proton availability, which increases as the anion is changed from to (as indicated by the increase of capacity and stability of cycles), and also the electrochemical oxidation of cobalt, leading to a maximal oxidation state of +3.7. The iron compounds are not pure; in addition to the pyroaurite phase, they contain some , which lowers the capacity.

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