A review on synthesis and studies on CoMn ₂ O ₄ / nanocomposite (metal oxide/metal sulphide/carbon material) based electrodes in view of supercapacitor applications

Abstract Binary metal oxide nanoparticles have huge attention nowadays because of their capability for use in energy saving systems. Typically, these compounds have an A x B 3-x O 4 structure, here A and B stands for two dissimilar metals such as Co, Ni, Mn, Fe, and Mo etc., This combination of metal cations (NiCo 2 O 4 , CoMn 2 O 4 , MnCo 2 O 4 , CoFe 2 O 4 , NiFe 2 O 4 , CoNi 2 O 4 ,etc.) provides a wide range of redox reactions and intensify electronic conductivity, which upgrades the electrochemical performance. Binary transition metal oxides provide combined effect of the monometallic oxides, which can enhance conductivity, more active sites, stability and storage capacity. Among binary metal oxides, Cobalt Manganese Oxide (CoMn 2 O 4 ) has outstanding capacitive performance as a result of greater tendency of cobalt to gain electrons and strong electron transport property of manganese. Due to these factors, researchers focus on cobalt manganese oxide-based supercapacitor electrodes. Hence a detailed and exhaustive review of works on CoMn 2 O 4 and its composites as potential candidates for supercapacitor electrode materials is carried out in this article.