title: Highly branched RuO2 nanoneedles on electrospun TiO2 nanofibers as an efficient electrocatalytic platform.
abstract: 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.
authors.forename: Su-Jin
authors.initials: SJ
authors.lastname: Kim
authors.forename: Yu Kyung
authors.initials: YK
authors.lastname: Cho
authors.forename: Jeesoo
authors.initials: J
authors.lastname: Seok
authors.affiliation: ‡National Institute for Nanomaterials Technology (NINT), Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea.
authors.forename: Nam-Suk
authors.initials: NS
authors.lastname: Lee
authors.forename: Byungrak
authors.initials: B
authors.lastname: Son
authors.affiliation: ⊥School of Mechanical and Advanced Materials Engineering, KIST-UNIST-Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, South Korea.
authors.forename: Jae Won
authors.initials: JW
authors.lastname: Lee
authors.affiliation: ⊥School of Mechanical and Advanced Materials Engineering, KIST-UNIST-Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, South Korea.
authors.forename: Jeong Min
authors.initials: JM
authors.lastname: Baik
authors.forename: Chongmok
authors.initials: C
authors.lastname: Lee
authors.forename: Youngmi
authors.initials: Y
authors.lastname: Lee
authors.forename: Myung Hwa
authors.initials: MH
authors.lastname: Kim
keywords: H2O2 electrochemical reaction; electrocatalyst; nanofiber; nanoneedle; ruthenium oxide; titanium oxide