Investigation on the electrochemical performance of hausmannite Mn3O4 nanoparticles by ultrasonic irradiation assisted co-precipitation method for supercapacitor electrodes

R. Tholkappiyan, A. Nirmalesh Naveen, K. Vishista, Fathalla Hamed

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

Abstract

Spinel type manganese oxide (Mn3O4) nanoparticles were synthesized by ultrasonic irradiation assisted co-precipitation method using PEG and NaOH. The formation of tetragonal hausmannite phase (Mn3O4) with spinel structure was confirmed from XRD and FTIR studies. The average crystallite size of Mn3O4 nanoparticles was determined from Scherrer formula (39.9 nm) and Williamson–Hall relation (36.5 nm). The presence of elements, the overall oxidation state of manganese (Mn2+, Mn3+ and Mn4+) and chemical composition of these nanoparticles were determined from Mn 2p, Mn 3s and O 1s spectra using XPS. The spherically shaped morphology of these nanoparticles was analysed by SEM. The expected chemical composition of Mn3O4 nanoparticles was analysed by EDS. The electrochemical performance of these Mn3O4 nanoparticles was studied by CV, CP and AC impedance analysis. The maximum specific capacitance of Mn3O4 nanoparticles was found to be 296 F/g at a current density of 1 A/g2. Nyquist plot shows lower value of resistance that indicates the good electrical conductivity of the Mn3O4 electrode, which accounts for the improved electrochemical performance of the supercapacitors. Hence, the use of surfactant and the presence of ultrasonic irradiation in the synthesis process plays a dominant role in the electrochemical performance of Mn3O4 supercapacitors.

Original languageEnglish
Pages (from-to)669-677
Number of pages9
JournalJournal of Taibah University for Science
Volume12
Issue number5
DOIs
Publication statusPublished - 2018

Keywords

  • MnO nanoparticles
  • Spinel
  • electrochemical performance
  • electrode
  • oxidation state

ASJC Scopus subject areas

  • General Agricultural and Biological Sciences
  • General Environmental Science
  • General Physics and Astronomy
  • General Mathematics
  • General Chemistry
  • General Biochemistry,Genetics and Molecular Biology
  • General Earth and Planetary Sciences

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