Facile fabrication and electrocatalytic activity of Pt0.9Pd0.1 alloy film catalysts
Facile fabrication and electrocatalytic activity of Pt0.9Pd0.1 alloy film catalysts
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DOI：
10.1016/j.jpowsour.2007.03.064
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发表时间：
2007-06
影响因子：
9.2
通讯作者：
Yan-hui Xu;Xiangqin Lin
中科院分区：
文献类型：
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作者：
Yan-hui Xu;Xiangqin Lin
采用简便的循环伏安(CV)方法，首次在玻碳电极(GCE)上制备了比表面积大大提高的Pt0.9Pd0.1多孔纳米合金薄膜。通过控制电沉积液的组成可以控制合金的原子比。结果表明，少量合金化Pd是铂催化剂的优良催化增强剂，其中以10%Pd为最佳。用FE-SEM、XPS、X射线衍射仪和电化学技术对Pt0.9Pd0.1合金膜的结构进行了表征。结果表明，Pt0.9Pd0.1薄膜为纳米孔道结构，平均由10.1 nm的微晶组成，使修饰电极(Pt0.9Pd0.1/GCE)的有效比表面积是相应的裸铂盘电极的790倍。Pt0.9Pd0.1/GCE对甲醇电氧化反应(MOR)和氧电还原反应(ORR)的稳定性和催化活性均显著高于相应的电沉积铂修饰GCE。这一优势可以归因于在电极表面制备的循环伏安纳米孔结构。该方法和制备的电极在生物传感器、燃料电池等领域具有广阔的应用前景。
A nano-thickness porous Pt0.9Pd0.1alloy film with a greatly enhanced surface area were firstly synthesized at a glassy carbon electrode (GCE) using a facile cyclic voltammetry (CV) method. The atomic ratio of the alloy can be controlled by controlling the composition of the electrodeposition solution. We found that small amount of alloying Pd is an excellent catalytically enhancing agent for the Pt catalyst, and 10% Pd is the optimal. The structures of the Pt0.9Pd0.1alloy film were characterized by FE-SEM, XPS, XRD and electrochemical techniques. It was found that the Pt0.9Pd0.1film was in nanoporous structure and consisted of crystallites of 10.1nm on average, leading to the modified electrode (Pt0.9Pd0.1/GCE) has an effective surface area as large as 790 times that of a corresponding bare Pt disk electrode. The Pt0.9Pd0.1/GCE exhibited significantly higher stability and catalytic activity for both of the methanol electro-oxidation reaction (MOR) and the oxygen electro-reduction reaction (ORR) than the correspondingly electrodeposited Pt modified GCE. The advantage can be attributed to the CV-prepared nano-porous structure on the electrode surface. This method and the prepared electrode can be expected to have promising applications in biosensors and fuel cells, etc.