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首页> 外文期刊>Electrochimica Acta >Methanol oxidation at platinized lead coatings prepared by a two-step electrodeposition-electroless deposition process on glassy carbon and platinum substrates
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Methanol oxidation at platinized lead coatings prepared by a two-step electrodeposition-electroless deposition process on glassy carbon and platinum substrates

机译：通过两步电沉积-化学沉积工艺在玻璃碳和铂基底上制备的镀铅涂层上的甲醇氧化

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摘要

Platinized lead deposits, Pt(Pb), have been formed on glassy carbon (GC) and platinum electrodes by a two-step process, whereby a controlled amount of Pb was electrodeposited onto the substrates and was subsequently coated with a thin Pt layer upon immersion of the Pb/GC or Pb/Pt electrodes into a chloroplatinic acid solution. The spontaneous surface replacement of Pb by Pt resulted in Pt(Pb)/GC or Pt(Pb)/Pt electrodes which consisted of dispersed Pt(Pb) particles and displayed typical Pt surface electrochemistry in deaerated acid solutions. When tested as methanol oxidation anodes, these electrodes exhibited enhanced electrocatalytic activity both during voltammetric and constant potential experiments. This behaviour is attributed to an electronic effect of the underlying Pb onto the Pt surface layer.
机译：通过两步法在玻璃碳（GC）和铂电极上形成了镀铂的铅沉积物Pt（Pb），从而将受控量的Pb电沉积到基底上，随后在浸入时用薄Pt层涂覆将Pb / GC或Pb / Pt电极放入氯铂酸溶液中。用Pt自发地置换Pb会导致Pt（Pb）/ GC或Pt（Pb）/ Pt电极，它们由分散的Pt（Pb）颗粒组成，并在脱气的酸溶液中显示出典型的Pt表面电化学。当作为甲醇氧化阳极进行测试时，这些电极在伏安法和恒电位实验中均表现出增强的电催化活性。该行为归因于下面的Pb在Pt表面层上的电子效应。

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