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首页> 外文期刊>Applied Surface Science >A nanogravimmetric investigation of the charging processes on ruthenium oxide thin films and their effect on methanol oxidation
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A nanogravimmetric investigation of the charging processes on ruthenium oxide thin films and their effect on methanol oxidation

机译：纳米重量法研究氧化钌薄膜的充电过程及其对甲醇氧化的影响

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摘要

The charging processes and methanol oxidation that occur during the oxidation-reduction cycles in a ruthenium oxide thin film electrode (deposited by the sol-gel method on Pt covered quartz crystals) were investigated by using cyclic voltammetry, chronoamperometry and electrochemical quartz crystal nanobalance techniques. The ruthenium oxide rutile phase structure was determined by X-ray diffraction analysis. The results obtained during the charging of rutile ruthenium oxide films indicate that in the anodic sweep the transition from Ru(II) to Ru(VI) occurs followed by proton de-intercalation. In the cathodic sweep, electron injection occurs followed by proton intercalation, leading to Ru(II). The proton intercalation/de-intercalation processes can be inferred from the mass/charge relationship which gives a slope close to I g mol(-1) (multiplied by the Faraday constant) corresponding to the molar mass of hydrogen. From the chronoamperometric measurements, charge and mass saturation of the RuO2 thin films was observed (440 ng cm(-2)) during the charging processes, which is related to the total number of active sites in these films. Using the electrochemical quartz crystal nanobalance technique to study the methanol oxidation reaction at these films was possible to demonstrate that bulk oxidation occurs without the formation of strongly adsorbed intermediates such as COads, demonstrating that Pt electrodes modified by ruthenium oxide particles can be promising catalysts for the methanol oxidation as already shown in the literature. (c) 2006 Elsevier B.V. All rights reserved.
机译：利用循环伏安法，计时安培法和电化学石英晶体纳米天平技术研究了氧化钌薄膜电极（通过溶胶-凝胶法沉积在Pt覆盖的石英晶体上）的氧化还原循环过程中发生的充电过程和甲醇氧化。通过X射线衍射分析确定氧化钌金红石相结构。在金红石型氧化钌薄膜充电过程中获得的结果表明，在阳极扫描中，发生了从Ru（II）到Ru（VI）的过渡，随后发生了质子脱嵌。在阴极扫描中，发生电子注入，随后插入质子，从而生成Ru（II）。质子的嵌入/脱嵌过程可以从质荷关系推导出，质荷关系的斜率接近于1 g mol（-1）（乘以法拉第常数），对应于氢的摩尔质量。从计时电流法测量，在充电过程中观察到RuO2薄膜的电荷和质量饱和度（440 ng cm（-2）），这与这些薄膜中活性位点的总数有关。使用电化学石英晶体纳米天平技术研究这些膜上的甲醇氧化反应，可能表明发生了本体氧化，而没有形成强吸附的中间体（如COads），这表明用氧化钌颗粒改性的Pt电极可能是制备Pd电极的催化剂。甲醇氧化已在文献中显示。 （c）2006 Elsevier B.V.保留所有权利。

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