X射线光电子能谱
催化作用
计时安培法
循环伏安法
材料科学
碳纳米管
高分辨率透射电子显微镜
化学工程
合金
电化学
介电谱
核化学
透射电子显微镜
化学
纳米技术
冶金
电极
有机化学
物理化学
工程类
作者
Aykut Çağlar,Hilal Kıvrak
标识
DOI:10.1016/j.ijhydene.2019.03.118
摘要
At present, ethanol electrooxidation study is performed on CNT supported Pd and PdAu catalysts to investigate the effect of Au addition to Pd towards the ethanol electrooxidation activity. NaBH4 reduction method is employed for the synthesis of Pd/CNT, Pd90Au10/CNT, Pd90Au10/CNT, Pd70Au30/CNT, Pd50Au50/CNT, and Pd40Au60/CNT catalysts. These catalysts are characterized via advanced surface analytical techniques namely N2 adsortion-desoprtion measurements,X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM). The characterization results revealed that Pd90Au10/CNT has 205.42 m2/g and 1.18 cm3/g BET surface area (m2/g) and pore volume (cm3/g), respectively. On the other hand, XRD and XPS results revealed that the electronic state of Pd90Au10/CNT catalyst changed by Au addition to Pd. TEM and HRTEM and elemental mapping results reveal that Pd and Au is homogeneously dispersed and alloying of Pd and Au is clearly observed, in agreement with the XRD and XPS results. Ethanol electrooxidation measurements in alkaline environment are performed by Cyclic Voltammetry (CV), Chronoamperometry (CA), Electrochemical impedance spectroscop (EIS) techniques. Pd90Au10/CNT displayed the highest specific and mass activity. The synergistic effect between Pd and Au at optimized metal ratio was utilized to obtain an improvement in specific activity. Furthermore, Pd90Au10/CNT showed the lowest charge transfer resistance (Rct) and a long term stability. As a result, it is clear that PdAu catalyst is a promising catalyst for Alkaline Direct Ethanol Fuel Cells.
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