Synthesis of hydrous ruthenium oxide nanoparticles in sub- and supercritical water and their capacitive properties

Antonius Dimas Chandra Permana, Agung Nugroho, Hong Shik Lee, Seong Min Bak, Kyung Yoon Chung, Byoung Koun Min, Jaehoon Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Hydrous ruthenium oxide (RuO2 · nH2O) nanoparticles with various particle sizes and water contents were synthesized in sub- and supercritical water in a very short reaction time of 15 min. The particle size, surface area, morphology, crystalline structure, and electrochemical properties were analyzed and compared with those of commercial RuO2 particles. Ultrafine spherical RuO2 · 0.6H2O nanoparticles with an average size of 4.2 nm were produced in subcritical water (250°C, 300 bar), while larger and more highly crystalline rod-shaped RuO2 · (0.3-0.5)H2O particles were produced in supercritical water (400°C, 300 bar). The use of NaOH under the supercritical water conditions resulted in a decrease in particle size. The hydrous RuO2 nanoparticles synthesized in subcritical water exhibited a much higher specific capacitance (255 F g-1) at a scan rate of 10 mV s-1 than those synthesized in supercritical water (77 F g-1) and commercial RuO2 (8 F g-1).

Original languageEnglish
Pages (from-to)1259-1269
Number of pages11
JournalChemical Engineering Communications
Volume201
Issue number10
DOIs
Publication statusPublished - 2014 Oct

Keywords

  • Ruthenium oxide
  • Subcritical water
  • Supercapacitor
  • Supercritical water

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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