Facile Route for Fabrication of Ferrimagnetic Mn 3 O 4 Spinel Material for Supercapacitors with Enhanced Capacitance

Wenjuan Yang, Mohamed Nawwar and Igor Zhitomirsky
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Wenjuan Yang: Department of Materials Science and Engineering, McMaster University, Hamilton, ON L8S4L7, Canada
Mohamed Nawwar: Department of Materials Science and Engineering, McMaster University, Hamilton, ON L8S4L7, Canada
Igor Zhitomirsky: Department of Materials Science and Engineering, McMaster University, Hamilton, ON L8S4L7, Canada

Energies, 2022, vol. 15, issue 5, 1-12

Abstract: The purpose of this investigation was the development of a new colloidal route for the fabrication of Mn 3 O 4 electrodes for supercapacitors with enhanced charge storage performance. Mn 3 O 4 -carbon nanotube electrodes were fabricated with record-high capacitances of 6.67 F cm −2 obtained from cyclic voltammetry tests at a scan rate of 2 mV s −1 and 7.55 F cm −2 obtained from the galvanostatic charge–discharge tests at a current density of 3 mA cm −2 in 0.5 M Na 2 SO 4 electrolyte in a potential window of 0.9 V. The approach involves the use of murexide as a capping agent for the synthesis of Mn 3 O 4 and a co-dispersant for Mn 3 O 4 and carbon nanotubes. Good electrochemical performance of the electrode material was achieved at a high active mass loading of 40 mg cm −2 and was linked to a reduced agglomeration of Mn 3 O 4 nanoparticles and efficient co-dispersion of Mn 3 O 4 with carbon nanotubes. The mechanisms of murexide adsorption on Mn 3 O 4 and carbon nanotube are discussed. With the proposed method, the time-consuming electrode activation procedure for Mn 3 O 4 electrodes can be avoided. The approach developed in this investigation paves the way for the fabrication of advanced cathodes for asymmetric supercapacitors and multifunctional devices, combining capacitive, magnetic, and other functional properties.

Keywords: manganese oxide; carbon nanotube; electrode; supercapacitor; capping agent; synthesis; dispersant (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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