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

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• 作者：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
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：July 22, 2015
• 年：2015
• 卷：7
• 期：28
• 页码：15321-15330
• 全文大小：707K
• ISSN：1944-8252

文摘

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鈥揟iO₂ nanofibers and Ru(OH)₃-TiO₂ nanofibers toward the reduction of [Fe(CN)₆]^{3鈥?/sup> were carefully examined by cyclic voltammetry carried out at various scan rates; the results indicated favorable charge-transfer kinetics of [Fe(CN)₆]3鈥?/sup> reduction via a diffusion-controlled process. Additionally, a test of the analytical performance of the RuO₂ nanoneedles鈥揟iO₂ nanofibers for the detection of a biologically important molecule, hydrogen peroxide (H₂O₂), indicated a high sensitivity (390.1 卤 14.9 渭A mM鈥? cm鈥? for H₂O₂ oxidation and 53.8 卤 1.07 渭A mM鈥? cm鈥? for the reduction), a low detection limit (1 渭M), and a wide linear range (1鈥?000 渭M), indicating H₂O₂ detection performance better than or comparable to that of other sensing systems.}