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首页> 外文期刊>Electrocatalysis >Synthesis, Characterization of Nanostructured Rhodium Films and their Electrochemical Behavior towards Carbon Monoxide Oxidation
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Synthesis, Characterization of Nanostructured Rhodium Films and their Electrochemical Behavior towards Carbon Monoxide Oxidation

机译：纳米铑膜的合成，表征及其对一氧化碳氧化的电化学行为

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摘要

Rhodium nanostructured thin film catalysts were prepared by pulsed laser deposition. The depositions were performed under vacuum and at different He background gas pressures ranging from 1 to 5 Torr. SEM, TEM, X-ray diffraction, and X-ray photoelectron spectroscopy were used to evaluate the morphology, the structure, the surface composition, and the electronic structure of the catalysts. Their electrochemical properties were studied towards CO stripping measurements in acidic solution; a reaction of critical issue to liquid fuel cells. It was discovered that rhodium (Rh) film deposited under 5 Torr of He background pressure showed the highest electroactive surface area, and the lowest onset potential of CO oxidation demonstrating an enhancement of the CO poisoning resistance. The reason for such enhanced electrocatalytic activity is ascribed to the high porosity and roughness of the Rh surface. Compared to Pt films made under similar processing conditions (5 Torr of He), Rh film displayed higher roughness factor of 58.5 (vs. 30 for Pt), a net charge due to oxidation and desorption of the CO adlayer of 385 μC cm~(-2) (vs. 350 μC cm~(-2) for Pt), and an onset potential for CO oxidation of 30 mV less anodic than that at Pt electrode.
机译：通过脉冲激光沉积制备铑纳米结构的薄膜催化剂。沉积是在真空和在1至5 Torr的不同He背景气压下进行的。 SEM，TEM，X射线衍射和X射线光电子能谱用于评估催化剂的形态，结构，表面组成和电子结构。研究了它们的电化学性质，以用于在酸性溶液中进行CO汽提测量。关键问题对液体燃料电池的反应。发现在5 Torr的He背景压力下沉积的铑（Rh）膜显示出最高的电活性表面积，并且CO氧化的起始电位最低，这表明CO抗中毒性增强。如此增强的电催化活性的原因归因于Rh表面的高孔隙率和粗糙度。与在类似工艺条件下（He为5 Torr）制成的Pt膜相比，Rh膜显示出更高的粗糙度系数58.5（Pt相对于30），由于CO吸附层的氧化和解吸而产生的净电荷为385μCcm〜（ -2）（与Pt相比为350μCcm〜（-2）），CO氧化的起始电位比Pt电极的阳极电位低30 mV。

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