Electrocatalysts for ethanol and ethylene glycol oxidation reactions. Part II: Effects of the polyol synthesis conditions on the characteristics and catalytic activity of Pt–Ru/C anodes
Electrocatalysts for ethanol and ethylene glycol oxidation reactions. Part II: Effects of the polyol synthesis conditions on the characteristics and catalytic activity of Pt–Ru/C anodes
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DOI：
10.1016/j.ijhydene.2015.06.154
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发表时间：
2014-10
影响因子：
7.2
通讯作者：
D. González-Quijano;W. Pech-Rodríguez;J. A. González‐Quijano;J. I. Escalante-García;G. Vargas-Gutiérrez;I. Alonso-Lemus;F. J. Rodríguez-Varela
中科院分区：
文献类型：
--
作者：
D. González-Quijano;W. Pech-Rodríguez;J. A. González‐Quijano;J. I. Escalante-García;G. Vargas-Gutiérrez;I. Alonso-Lemus;F. J. Rodríguez-Varela
本文介绍了多元醇合成条件对铂基合金的物理化学和电催化性能的影响。采用多元醇法合成了Pt：Ru原子比为1：1的Pt-Ru/C合金。将Pt-Ru/C催化剂作为乙醇和乙二醇氧化反应的阳极进行测试。X射线衍射分析表明，Pt-Ru/C催化剂的结晶度较低，这限制了对催化剂平均粒径、合金化程度和晶格常数等重要因素的分析。这种结构特征归因于非常小的颗粒尺寸，如通过TEM分析所证实的。通过EDS的化学组成表明，Pt：Ru 1：1的比例可以在大多数合成条件下实现。此外，氧化物的形成是一个恒定的特性，无论水存在或不存在的合成过程中。电化学表征表明，合成条件对Pt-Ru/C合金的电催化活性有重要影响。与Pt/C催化剂相比，所有的合金显示出较低的氧化反应的起始电位，但其中几个提供较小的氧化电流密度。
This paper presents a continuation about the effects of polyol synthesis conditions on the physicochemical and electrocatalytic characteristics of Pt-based alloys. Pt–Ru/C alloys with nominal Pt:Ru atomic ratio of 1:1 were synthesized by a polyol process with different ethylene glycol:ethanol:water volume ratios. The Pt–Ru/C catalysts were tested as anodes for the Ethanol and the Ethylene Glycol Oxidation Reactions. X-ray diffraction showed that the Pt–Ru/C catalysts have low crystallinity, which limited the analysis of some important factors such as average particle size, degree of alloying and lattice parameter. Such structural feature was attributed to a very small particle size, as confirmed by TEM analysis. The chemical composition by EDS indicated that the Pt:Ru 1:1 ratio can be achieved under most of the synthesis conditions. Moreover, the formation of oxides was a constant characteristic, whether water was present or absent during the synthesis. The electrochemical characterization showed that the synthesis conditions have an important effect on the electrocatalytic activity of the Pt–Ru/C alloys for both oxidation reactions. Compared to a Pt/C catalyst, all of the alloys showed lower onset potentials for the oxidation reactions, but several of them delivered smaller oxidation current densities.