Tetragonal CoMn 2 O 4 nanocrystals on electrospun carbon fibers as high-performance battery-type supercapacitor electrode materials

• Published in: Dalton transactions : an international journal of inorganic chemistry 2021-11, Vol.50 (43), p.15669-15678
• Main Authors: Mijailović, Daniel M., Radmilović, Vuk V., Lačnjevac, Uroš Č., Stojanović, Dušica B., Bustillo, Karen C., Jović, Vladimir D., Radmilović, Velimir R., Uskoković, Petar S.
• Format: Article
• Language: English
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/D1DT02829D

We herein report a simple two-step procedure for fabricating tetragonal CoMn 2 O 4 spinel nanocrystals on carbon fibers. The battery-type behavior of these composite fibers arises from the redox activity of CoMn 2 O 4 in an alkaline aqueous solution, which, in combination with the carbon fibers, endows good electrochemical performance and long-term stability. The C@CoMn 2 O 4 electrode exhibited high specific capacity, up to 62 mA h g −1 at 1 A g −1 with a capacity retention of around 90% after 4000 cycles. A symmetrical coin-cell device assembled with the composite electrodes delivered a high energy density of 7.3 W h kg −1 at a power density of 0.1 kW kg −1 , which is around 13 times higher than that of bare carbon electrodes. The coin cell was cycled for 5000 cycles with 96.3% capacitance retention, at a voltage of up to 0.8 V, demonstrating excellent cycling stability.