Nickel Foam Supported-Co3O4 Nanowire Arrays for H2O2 Electroreduction

Nickel Foam Supported-Co3O4 Nanowire Arrays for H2O2 Electroreduction
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用于 H2O2 电解还原的泡沫镍 Co3O4 纳米线阵列

DOI:
10.1021/cm901928b
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发表时间:
2009-10
影响因子:
8.6
通讯作者:
Cheng, Lin
Cheng, Lin
中科院分区:
材料科学2区
文献类型:
--
作者:
Wang, Guiling;Cao, Dianxue;Yin, Cuilei;Gao, Yinyi;Yin, Jinling;Cheng, Lin

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采用无模板生长法制备了泡沫镍负载Co3O4纳米线阵列,并对其进行了扫描电子显微镜、透射电子显微镜、X射线衍射仪、红外光谱、热重和差热分析等表征。Co3O4纳米线直径约2 5 0 nm,长达15μm,Brunauer-Emmett-Teller表面积为78.4m2 g−1。它们几乎垂直于泡沫镍骨架表面生长,密集堆积,均匀覆盖整个泡沫镍骨架表面。用循环伏安法、计时电流法和交流阻抗谱研究了碱性介质中Co3O4纳米线阵列上H_2O_2的电还原行为。Co3O4纳米线电极对H_2O_2电还原具有良好的活性、稳定性和传质性能。当−为0.4V、0.4moldm−_3H_2O_2和3.0mol dm−_3NaOH时,室温下的电流密度为90 mA cm−_2。每克电流..。
Ni foam supported-Co3O4 nanowire arrays are prepared by a template-free growth method, followed by a thermal treatment in air, and are characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, infrared spectroscopy, and thermogravimetric and differential thermal analysis. The Co3O4 nanowires have a diameter of about 250 nm, a length up to 15 μm, and a Brunauer-Emmett-Teller surface area of 78.4 m2 g−1. They grow almost vertically from the surface of Ni foam skeleton, pack densely, and uniformly cover the entire surface of Ni foam skeleton. Electroreduction of H2O2 on Co3O4 nanowire arrays in alkaline medium is investigated by cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. The Co3O4 nanowire electrode exhibits superior activity, stability, and mass transport property for H2O2 electroreduction. A current density of 90 mA cm−2 is achieved at −0.4 V in 0.4 mol dm−3 H2O2 and 3.0 mol dm−3 NaOH at room temperature. The per gram current...
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