Highly Efficient Electrochemical Responses on Single Crystalline Ruthenium–Vanadium Mixed Metal Oxide Nanowires

다국어 초록 (Multilingual Abstract)

<P>Highly efficient single crystalline ruthenium–vanadium mixed metal oxide (Ru<SUB>1–<I>x</I></SUB>V<SUB><I>x</I></SUB>O<SUB>2</SUB>, 0 ≤ <I>x</I> ≤ 1) nanowires were prepared on a SiO<SUB>2</SUB> substrate and a commercial Au microelectrode for the first time through a vapor-phase transport process by adjusting the mixing ratios of RuO<SUB>2</SUB> and VO<SUB>2</SUB> precursors. Single crystalline Ru<SUB>1–<I>x</I></SUB>V<SUB><I>x</I></SUB>O<SUB>2</SUB> nanowires show homogeneous solid-solution characteristics as well as the distinct feature of having remarkably narrow dimensional distributions. The electrochemical observations of a Ru<SUB>1–<I>x</I></SUB>V<SUB><I>x</I></SUB>O<SUB>2</SUB> (<I>x</I> = 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)<SUB>6</SUB>]<SUP>3–/4–</SUP> and Ru(NH<SUB>3</SUB>)<SUB>6</SUB><SUP>3+/2+</SUP> couples compared to that of a bare Au microelectrode. The catalytic activity of Ru<SUB>1–<I>x</I></SUB>V<SUB><I>x</I></SUB>O<SUB>2</SUB> for oxygen and H<SUB>2</SUB>O<SUB>2</SUB> 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.</P><P><B>Graphic Abstract</B>
<IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-17/am4016445/production/images/medium/am-2013-016445_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am4016445'>ACS Electronic Supporting Info</A></P>