Probing the electrochemical properties of NiMn2O4 nanoparticles as prominent electrode materials for supercapacitor applications

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Vol. 271; p. 115298
• Main Authors: Dhas, Suprimkumar D., Maldar, Parvejha S., Patil, Meenal D., Waikar, Maqsood R., Sonkawade, Rajendra G., Chakarvarti, Shiv K., Shinde, Surendra K., Kim, Dae Y., Moholkar, Annasaheb V.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01-09-2021; Elsevier BV
• Subjects: Capacitance; Crystallites; Cubic spinel structure; Electrochemical analysis; Electrode materials; Electrodes; Electrolytes; Electrons; Mixed transition metal oxides; Nanoparticles; NiMn2O4 (Nickel Manganese Oxide); Sol-gel processes; Sol–gel method; Specific capacitance; Supercapacitors; Specific capacitance; Supercapacitors; Cubic spinel structure; Mixed transition metal oxides; Sol–gel method; NiMn2O4 (Nickel Manganese Oxide)
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2021.115298

NiMn2O4 (NMO) powders are synthesized by the sol–gel route and the NMO1 electrode is fabricated from the powder synthesized at a calcination temperature of 500 °C. The specific capacitance of the NMO1 electrode is improved from 571 Fg−1 to 762 Fg−1 at a scan rate of 5 mVs−1, with an increase in the concentration of KOH electrolyte from 1 M to 6 M.
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NiMn2O4 (NMO) powders have been prepared by facile sol–gel route, and the effect of annealing temperature and the concentration of KOH electrolyte on its electrochemical performance has been investigated. The electrochemical performance of the NMO electrodes is tested via a three electrode arrangement in KOH electrolyte. The NMO electrode (NMO1) prepared from the powder synthesized at a temperature of 500 °C with an approximate crystallite size of 10 nm exhibits maximum specific capacitance of 571 Fg−1 at a scan rate of 5 mVs−1 in 1 M KOH electrolyte. The specific capacitance of the NMO1 electrode is found to be improved from 571 Fg−1 in 1 M KOH to 762 Fg−1 in 6 M KOH electrolyte. The improvement in the specific capacitance of the NMO1 working electrode in 6 M KOH electrolyte can be attributed to good electrochemical utilization and an effective charge storage mechanism.