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In this study, the effect of oxygen vacancy in the CoMn 2 O 4  on pseudocapacitive characteristics was examined, and two tetragonal CoMn 2 O 4  spinel compounds with different oxygen vacancy concentrations and morphologies were synthesized by controlling the mixing sequence of the Co and Mn precursors. The mixing sequence was changed; thus, morphologies were changed from spherical nanoparticles to nanoflakes and oxygen vacancies were increased. Electrochemical studies have revealed that tetragonal CoMn 2 O 4  spinels with a higher number of oxygen vacancies exhibit a higher specific capacitance of 1709 F g −1  than those with a lower number of oxygen vacancies, which have a higher specific capacitance of 990 F g −1 . Oxygen vacancies create an active site for oxygen ion intercalation. Therefore, oxidation–reduction reactions occur because of the diffusion of oxygen ions at octahedral/tetrahedral crystal edges. The solid-state asymmetric pseudocapacitor exhibits a maximum energy density of 32 Wh-kg −1  and an excellent cyclic stability of nearly 100%.

Role of precursors mixing sequence on the properties of CoMn2O4 cathode materials and their application in pseudocapacitor