(a–c) FE‐SEM; (d) TEM; and (e) is the SAED pattern of Mn3O4 with (211) in the FMcHFiMMcHoniioRgnmgdnRnmu‐3ui3OTp‐3crOrOTpaeEoe44tE/o sM4ir1/1/ivsMGtr..Ri ee Gt(O(s gieaaomO.os–i, –f...