Manganese dioxide nanoparticles synthesized by electrochemical method and its catalytic activity towards oxygen reduction reaction

Mahmudi Mahmudi, Widiyastuti Widiyastuti, Puspita Nurlilasari, Samsudin Affandi, Heru Setyawan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Manganese dioxide having nanorod and nanoflake morphologies have been successfully prepared by electrolysis of KMnO4 at a temperature of 60°C. The acidity of the solution substantially influenced the particle morphology. The particles had nanorod morphology at a very acid solution (pH 0.2) whereas they had nanoflake shape at the base condition (pH 9). X-ray diffraction analysis revealed that the particles generated at very acid condition were -MnO2. On the other hand, the particles synthesized at base condition were amorphous MnO2. The electrocatalytic activity towards oxygen reduction reaction (ORR) of the materials was studied in oxygensaturated 0.6M KOH solution. The electrons transferred per oxygen molecules of ORR for nanorod and nanoflake MnO2 particles were 2.23 and 1.75, respectively. The results suggest that nanorod MnO2 particles exhibit better ORR activity corresponding to 2-electron transferred ORR mechanism.

Original languageEnglish
Pages (from-to)906-913
Number of pages8
JournalJournal of the Ceramic Society of Japan
Volume126
Issue number11
DOIs
Publication statusPublished - Nov 2018

Keywords

  • Electrocatalytic
  • Manganese oxide
  • Nanoflake
  • Nanorod
  • ORR activity

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