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首页> 外文期刊>Electrocatalysis >Redox and Oxygen Evolution Electrocatalytic Properties of Nafion and Single-Walled Carbon Nanotube/Hydrous Iron Oxide Composite Films
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Redox and Oxygen Evolution Electrocatalytic Properties of Nafion and Single-Walled Carbon Nanotube/Hydrous Iron Oxide Composite Films

机译：Nafion和单壁碳纳米管/水合氧化铁复合膜的氧化还原和析氧电催化性能

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Novel Nafion and single-walled carbon nanotube composite hydrous iron oxide electrodes have been fabricated using a simple potential cycling methodology and are examined as oxygen evolution electrocatalyst films. Hydrous oxide materials prepared in this manner are typically quite amorphous in nature. Here, we show, using scanning electron microscopy and cyclic voltammetry, that a more uniform oxide growth can be achieved using a Nafion or carbon nanotube matrix as a template. This templated growth produces oxide films with unique surface morphologies and electrical properties. In particular, the composite films exhibit superior conductivity, as shown by electrochemical impedance spectroscopy, with up to eightfold decrease in charge transfer resistance. The ultimate result is an enhancement in the electrocatalytic performance of the hydrous Fe oxide film. Steady-state polarisation studies on the oxygen evolution reaction show a reduction in overpotential of up to 50 mV for the composite electrodes with a threefold increase in turnover frequency.
机译：新型的Nafion和单壁碳纳米管复合水合氧化铁电极已经使用简单的电势循环方法进行了制备，并已被用作氧气析出电催化剂膜。以这种方式制备的含水氧化物材料通常本质上是非常无定形的。在这里，我们显示，使用扫描电子显微镜和循环伏安法，使用Nafion或碳纳米管基质作为模板，可以实现更均匀的氧化物生长。这种模板化生长产生具有独特表面形态和电性能的氧化膜。尤其是，复合膜表现出优异的导电性，如电化学阻抗谱所示，电荷转移电阻可降低多达八倍。最终结果是增强了水合氧化铁膜的电催化性能。氧气逸出反应的稳态极化研究表明，复合电极的超电势降低了50 mV，转换频率增加了三倍。

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