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首页> 外文期刊>Electrocatalysis >Electrochemical Deposition of Pt-RuO (x) a <...nH(2)O Composites on Conductive Diamond and Its Application to Methanol Oxidation in Acidic Media
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Electrochemical Deposition of Pt-RuO (x) a <...nH(2)O Composites on Conductive Diamond and Its Application to Methanol Oxidation in Acidic Media

机译：导电金刚石上Pt-RuO（x）a <... nH（2）O复合材料的电化学沉积及其在酸性介质中甲醇氧化中的应用

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摘要

Boron-doped diamond (BDD) films were used as substrates for the electrochemical deposition of a platinum-hydrous ruthenium oxide (Pt-RuO (x) a <...nH(2)O) composite with promising electrocatalytic activity for methanol oxidation. The influence of the BDD surface termination was checked, and it was found that oxidized diamond (BDD-O) not only allows more efficient RuO (x) a <...nH(2)O deposition but also enables a higher surface concentration of oxygenated carbon species. Scanning electron microscopy (SEM) and cyclic voltammetry experiments have shown that, with a BDD-O support, an increase of the oxide loading from ca. 3 to ca. 140 mu g cm(-2) results in an enhancement of approximately six times of the specific surface area of deposited Pt particles, with beneficial effects on the electrocatalytic activity for methanol oxidation. However, in terms of resistance to fouling, a lower amount of RuO (x) a <...nH(2)O appeared to be more advantageous, probably due to the fact that, as evidenced by X-ray photoelectron spectroscopy (XPS), it allows higher surface concentration of oxidized species of both carbon and platinum. These species could act as oxygen donors and may facilitate further oxidation of carbon monoxide to CO2.
机译：掺硼金刚石（BDD）薄膜用作电化学沉积铂水合氧化钌（Pt-RuO（x）a ...... nH（2）O）复合材料的基材，该复合材料具有用于甲醇氧化的有希望的电催化活性。检查了BDD表面终止的影响，发现氧化金刚石（BDD-O）不仅允许更有效的RuO（x）a <... nH（2）O沉积，而且还允许更高的表面浓度。含氧碳物质。扫描电子显微镜（SEM）和循环伏安法实验表明，在BDD-O载体的作用下，Ca的氧化物负载量增加。 3至140μg cm（-2）可使沉积的Pt颗粒的比表面积增加约6倍，并对甲醇氧化的电催化活性产生有利影响。然而，就抗结垢性而言，较低的RuO（x）a <... nH（2）O似乎更有利，这可能是由于X射线光电子能谱（XPS）所证明的事实。 ），可以使碳和铂的氧化物质的表面浓度更高。这些物质可以充当供氧体，并可以促进一氧化碳进一步氧化为二氧化碳。

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