新型三元DMFC催化剂中铅的作用评价
Evaluating the role of Lead In A Novel Ternary Catalysts For DMFCs
摘要：
低电位下的电流密度是燃料电池技术中非常需要的，也是设计新催化剂的关键。通过将铂与各种其他金属合金化，改进的燃料电池催化剂已经获得了很多关注和兴趣。本文采用微乳液法合成了一种新型的直接甲醇燃料电池阳极催化剂PtPb@Ru。用各种光谱和显微技术对催化剂进行了表征。催化剂的活性和耐久性已经通过在0.1M HClO 4和1 M甲醇中运行循环伏安法测试。为了解释与市售PtRu催化剂相比PtPb@ Ru催化剂的电流密度增加许多倍，在电化学电池中对PtPb @ Ru催化剂在PtL 3边缘处进行原位X射线吸收光谱（XAS）测量（XANES和EXAFS）。在XAS研究中观察到的铂的d带中心的下移可能是这里观察到的更好的活性和高电流密度的原因。
英文摘要：
The current density at lower potential is highly desirable in fuel cell technology and crucial center point for designing a new catalyst. By alloying platinum with various other metals, the improvisation of the fuel cell catalyst has achieved a lot of attention and interests. In this article, a novel porous ternary alloy PtPb@Ru as anode catalysts for direct methanol fuel cell had been synthesized by micro-emulsion technique. The catalysts had been characterized by various spectroscopic and microscopic techniques. The activity and durability of the catalysts had been tested by running cyclic voltammetry in 0.1 M HClO4 and 1M Methanol. To explain the many fold increase in current density of the PtPb@Ru catalysts in comparison to the commercial available PtRu catalysts, in situ X-ray absorption spectroscopy (XAS) measurements, at the PtL3 edge (XANES and EXAFS) were carried out on the PtPb@Ru catalysts in an electrochemical cell. The down-shift in the d-band center of platinum observed in the XAS study, might be responsible for the better activity and high current density observed here.
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