Two-step oxygen reduction on spinel NiFe2O4 catalyst: Rechargeable, aqueous solution- and gel-based, Zn-air batteries

Electrocatalysts that lead to a four electron oxygen reduction reaction are generally proposed for metal-air batteries. Herein, we show that spinel NiFe2O4 catalyses oxygen reduction reaction by a two step process through stable peroxide species in aqueous medium. Further, it acts as an efficient bi...

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Bibliographic Details
Published in:Electrochimica acta 2018-12, Vol.292, p.268-275
Main Authors: Naik, Keerti M., Sampath, S.
Format: Article
Language:English
Subjects:
Batteries
Bifunctional electrocatalyst
Rechargeable zinc-air
Spinel NiFe2O4
Two step oxygen reduction
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Summary:Electrocatalysts that lead to a four electron oxygen reduction reaction are generally proposed for metal-air batteries. Herein, we show that spinel NiFe2O4 catalyses oxygen reduction reaction by a two step process through stable peroxide species in aqueous medium. Further, it acts as an efficient bifunctional catalyst for oxygen reduction and oxygen evolution reactions with favourable rechargeable-battery characteristics. The kinetic parameters are deduced using electrochemical techniques. Rechargeable zinc-air batteries have been assembled using aqueous solution-as well as gel-based electrolytes and the battery characteristics are studied. [Display omitted]
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2018.08.138