Structural and electrochemical characterization of carbon supported Pt-Pr catalysts for direct ethanol fuel cells prepared using a modified formic acid method in a CO atmosphere.
Structural and electrochemical characterization of carbon supported Pt-Pr catalysts for direct ethanol fuel cells prepared using a modified formic acid method in a CO atmosphere.
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DOI：
10.1039/c3cp51183a
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发表时间：
2013-07
期刊：
影响因子：
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通讯作者：
P. Corradini;E. Antolini;J. Perez
中科院分区：
文献类型：
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作者：
P. Corradini;E. Antolini;J. Perez
采用改进的甲酸法制备了 Pt-Pr/C 电催化剂，并将其对一氧化碳和乙醇氧化的活性与 Pt/C 进行了比较。通过 XRD 分析未检测到明显的合金形成。通过 TEM 测量发现，Pt 颗粒尺寸随着催化剂中 Pr 含量的增加和金属前体添加时间的减少而增加。 XPS 测量表明催化剂表面存在 Pt 偏析以及 Pr2O3 和 PrO2 氧化物的存在。 Pr的添加提高了Pt对CO和CH3CH2OH氧化的电催化活性。 Pt-Pr/C 催化剂活性的增强归因于 Pr2O3 的存在引起的电子效应和 PrO2 的存在引起的双功能机制。
Pt-Pr/C electrocatalysts were prepared using a modified formic acid method, and their activity for carbon monoxide and ethanol oxidation was compared to Pt/C. No appreciable alloy formation was detected by XRD analysis. By TEM measurements it was found that Pt particle size increases with an increasing Pr content in the catalysts and with decreasing metal precursor addition time. XPS measurements indicated Pt segregation on the catalyst surface and the presence of Pr2O3 and PrO2 oxides. The addition of Pr increased the electro-catalytic activity of Pt for both CO and CH3CH2OH oxidation. The enhanced activity of Pt-Pr/C catalysts was ascribed to both an electronic effect, caused by the presence of Pr2O3, and the bi-functional mechanism, caused by the presence of PrO2.