Abstract
A new type of aqueous iron–air (Fe–air) battery is demonstrated with an alkaline anode electrolyte (anolyte) and an acidic cathode electrolyte (catholyte). The anolyte and catholyte are separated by an alkali-metal-ion (Li+-ion or Na+-ion) solid-electrolyte separator in which the alkali metal ion serves as an ionic mediator to sustain the redox reactions at the anode and cathode. Coupling the acidic air cathode with the alkaline iron anode demonstrates a voltage-enhanced Fe–air battery. To reduce the cell overpotential, the Fe–air battery is operated with decoupled bifunctional air cathodes comprising an IrO2/Ti (iridium oxide on titanium mesh) electrode for the oxygen evolution reaction and a Pt/C (carbon-supported platinum) electrode for the oxygen reduction reaction.
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