Highly Branched RuO2 Nanoneedles on Electrospun TiO2 Nanofibers as an Efficient Electrocatalytic Platform

Su Jin Kim, Yu Kyung Cho, Jeesoo Seok, Nam Suk Lee, Byungrak Son, Jae Won Lee, Jeong Min Baik, Chongmok Lee, Youngmi Lee, Myung Hwa Kim

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32 Scopus citations


Highly single-crystalline ruthenium dioxide (RuO2) nanoneedles were successfully grown on polycrystalline electrospun titanium dioxide (TiO2) nanofibers for the first time by a combination of thermal annealing and electrospinning from RuO2 and TiO2 precursors. Single-crystalline RuO2 nanoneedles with relatively small dimensions and a high density on electrospun TiO2 nanofibers are the key feature. The general electrochemical activities of RuO2 nanoneedles-TiO2 nanofibers and Ru(OH)3-TiO2 nanofibers toward the reduction of [Fe(CN)6]3- were carefully examined by cyclic voltammetry carried out at various scan rates; the results indicated favorable charge-transfer kinetics of [Fe(CN)6]3- reduction via a diffusion-controlled process. Additionally, a test of the analytical performance of the RuO2 nanoneedles-TiO2 nanofibers for the detection of a biologically important molecule, hydrogen peroxide (H2O2), indicated a high sensitivity (390.1 ± 14.9 μA mM-1 cm-2 for H2O2 oxidation and 53.8 ± 1.07 μA mM-1 cm-2 for the reduction), a low detection limit (1 μM), and a wide linear range (1-1000 μM), indicating H2O2 detection performance better than or comparable to that of other sensing systems.

Original languageEnglish
Pages (from-to)15321-15330
Number of pages10
JournalACS Applied Materials and Interfaces
Issue number28
StatePublished - 22 Jul 2015

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.


  • HO electrochemical reaction
  • electrocatalyst
  • nanofiber
  • nanoneedle
  • ruthenium oxide
  • titanium oxide


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