Highly efficient electrochemical responses on single crystalline ruthenium-vanadium mixed metal oxide nanowires

Sung Hee Chun, Hyun A. Choi, Minkyung Kang, Moonjee Koh, Nam Suk Lee, Sang Cheol Lee, Minyung Lee, Youngmi Lee, Chongmok Lee, Myung Hwa Kim

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Highly efficient single crystalline ruthenium-vanadium mixed metal oxide (Ru1-xVxO2, 0 ≤ x ≤ 1) nanowires were prepared on a SiO2 substrate and a commercial Au microelectrode for the first time through a vapor-phase transport process by adjusting the mixing ratios of RuO2 and VO2 precursors. Single crystalline Ru1-xVxO2 nanowires show homogeneous solid-solution characteristics as well as the distinct feature of having remarkably narrow dimensional distributions. The electrochemical observations of a Ru1-xVxO2 (x = 0.28 and 0.66)-decorated Au microelectrode using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) demonstrate favorable charge-transfer kinetics of [Fe(CN)6]3-/4- and Ru(NH3)6 3+/2+ couples compared to that of a bare Au microelectrode. The catalytic activity of Ru1-xVxO2 for oxygen and H2O2 reduction at neutral pH increases as the fraction of vanadium increases within our experimental conditions, which might be useful in the area of biofuel cells and biosensors.

Original languageEnglish
Pages (from-to)8401-8406
Number of pages6
JournalACS Applied Materials and Interfaces
Volume5
Issue number17
DOIs
StatePublished - 11 Sep 2013

Keywords

  • electrocatalyst
  • HO reduction
  • nanowire
  • oxygen reduction reaction
  • ruthenium-vanadium mixed oxide

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