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首页> 外文期刊>International Journal of Electrochemical Science >Synthesis, Characterization and Electrocatalytic Activity of Bi- and Tri-metallic Pt-Based Anode Catalysts for Direct Ethanol Fuel Cells
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Synthesis, Characterization and Electrocatalytic Activity of Bi- and Tri-metallic Pt-Based Anode Catalysts for Direct Ethanol Fuel Cells

机译：直接乙醇燃料电池双金属和三金属铂基阳极催化剂的合成，表征和电催化活性

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Three Pt-based anode catalysts supported on Vulcan XC-72R (VC) were prepared by using a modifiedpolyol process. These materials were characterized and tested by X-Ray Diffraction (XRD), X-RayFluorescence (XRF) and Transmission Electron Microscopy (TEM). XRD and TEM analysis indicatedthat especially the ternary anode catalysts consisted of uniform nanosized particles with sharpdistribution. The Pt lattice parameter was smaller, in the ternary PtSnIr catalyst whereas it increasedwith the addition of Sn and Rh, in the corresponding binary and ternary catalysts. Cyclic voltammetry(CV) measurements showed that Sn, Ir and Rh may act as promoter of Pt enhancing ethanol electro- oxidation activity. It was found that the direct ethanol fuel cell (DEFC) performances weresignificantly improved with these modified anode catalysts. This effect on the DEFC performance isattributed to the so-called bi-tri-functional mechanism and to the electronic interaction between Pt andadditives. The performance increased significantly with the temperature. However, it was alsopossible to observe some decay with time for all catalysts due to the formation of surface poisons,probably consisting in CO-like species. At 60 C, the PtSnIr catalyst showed the best performance, as aresult of a proper morphology and promoting effect.
机译：通过使用改进的多元醇工艺制备了三种负载在Vulcan XC-72R（VC）上的Pt基阳极催化剂。通过X射线衍射（XRD），X射线荧光（XRF）和透射电子显微镜（TEM）对这些材料进行了表征和测试。 XRD和TEM分析表明，特别是三元阳极催化剂由分布均匀，分布均匀的纳米颗粒组成。在三元PtSnIr催化剂中，Pt晶格参数较小，而在相应的二元和三元催化剂中，Pt晶格参数随Sn和Rh的添加而增加。循环伏安法（CV）测量表明，Sn，Ir和Rh可能充当Pt的促进剂，增强乙醇的电氧化活性。发现使用这些改性的阳极催化剂显着改善了直接乙醇燃料电池（DEFC）的性能。这种对DEFC性能的影响归因于所谓的双三功能机制以及Pt与添加剂之间的电子相互作用。性能随温度显着提高。然而，由于表面毒物的形成，所有催化剂随着时间的流逝也可能出现衰减，这可能是由类CO物质组成的。由于在适当的形貌和促进作用下，PtSnIr催化剂在60℃时表现出最好的性能。

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