Construction and electrochemical performance analysis of high performance graphene oxide intercalation composite zinc manganese oxide (ZnMn2O4) air electrode catalyst for potassium-oxide batteries

Inhalt:
Potassium-oxide batteries as promising energy storage systems have attracted more and more attention in recent years. Nevertheless, air electrode catalyst directly affects the electrochemical performances. In this paper, a type of graphene oxide intercalation composite zinc manganese oxide (ZnMn2O4) is used as air electrode catalyst for potassium-oxide batteries. Structural composition and micromorphology discover that ZnMn2O4 can composite into the graphene oxide intercalation and emerge some fluffy distribution morphology. When as air electrode catalyst for potassium-oxygen batteries, this can expose more active sites and supply more mass transmission channels for the electrochemical reaction. Electrochemical test results show that the air electrode with graphene oxide intercalation composite zinc manganese oxide as catalyst can successfully complete the oxygen reduction and oxygen evolution reaction along with excellent reversibility and low charge transfer resistance. Initial discharge specific capacity can achieve to 3078.02 mAh.g^-1 at 0.1 mA.cm^-2 current density and complete 3 time charging and discharging cycles at the condition of limited capacity to 300 mAh.g^-1.