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Highly porous and uniform sphere shape Fe powder with a nano‐porous structure can be prepared successfully with a spray pyrolysis method and applied for solid oxide Fe–air rechargeable battery, which is consisted of solid oxide reversible cells using an H2O/H2 redox mediator. The prepared Fe powder modified with both Cr2O3 and Ce0.6Mn0.3Fe0.1O2 shows a high redox reaction rate as well as cycle stability...
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