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首页> 外文期刊>Applied Surface Science >Electrosynthesis and characterization of PdIr using electrochemical atomic layer deposition for ethanol oxidation in alkaline electrolyte
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Electrosynthesis and characterization of PdIr using electrochemical atomic layer deposition for ethanol oxidation in alkaline electrolyte

机译：电化学原子层沉积法在碱性电解液中乙醇氧化法对PdIr进行电合成和表征

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摘要

This work reports Pd and PdIr thin films electrodeposition via surface limited redox replacement reaction using electrochemical atomic layer deposition technique. Cyclic voltammetry (CV) showed Pd and PdIr voltammetric signatures confirming the successful utilization of Cu as sacrificial metal for Pd and Ir ions. The resulting deposits were further characterized using XRD, EDS, XPS, SEM and AFM, confirming their structural morphology and surface roughness. The catalytic activity of the thin films towards the oxidation of ethanol was determined using CV. PdIr showed a more negative onset potential and higher current (-0.423 V; 0.664 mA) than Pd (-0.402 V; 0.494 mA) thin film, indicating a more catalytic behavior. Further, PdIr showed a higher if/ib ratio of 1.094 than Pd (if/ib = 0.94) indicating higher tolerance to poisoning by ethanol intermediates than Pd. Moreover, chronoamperometry (CA) confirmed that the addition of Ir to Pd improves the stability of the PdIr film. The resultant behaviour was also confirmed by EI spectroscopy with smaller Rct = 0.23 (k Omega) for PdIr than that of Pd; Rct = 14.8 (k Omega) when.Subjected at a fixed potential of -0.2 V. The higher catalytic activity of PdIr towards EOR makes it a promising candidate as electrocatalyst for alkaline direct ethanol fuel cell (DEFCs) than Pd.
机译：这项工作报告了使用电化学原子层沉积技术通过表面有限的氧化还原置换反应进行Pd和PdIr薄膜的电沉积。循环伏安法（CV）显示了Pd和PdIr伏安特征，确认了成功地将Cu用作Pd和Ir离子的牺牲金属。使用XRD，EDS，XPS，SEM和AFM对生成的沉积物进行进一步表征，确认其结构形态和表面粗糙度。使用CV确定薄膜对乙醇氧化的催化活性。与Pd（-0.402 V; 0.494 mA）薄膜相比，PdIr显示出更大的负起始电位和更高的电流（-0.423 V; 0.664 mA），表明具有更高的催化性能。此外，PdIr的if / ib比为1.094，比Pd高（if / ib = 0.94），表明乙醇中间体对中毒的耐受性高于Pd。此外，计时电流法（CA）证实，向Pd中添加Ir可以改善PdIr膜的稳定性。 EI光谱也证实了所得行为，PdIr的Rct = 0.23（k Omega）比Pd小；当Rct = 14.8（k Omega）时，固定电势为-0.2V。PdIr对EOR的更高催化活性使其成为比Pd更有价值的碱直接乙醇燃料电池（DEFCs）电催化剂。

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