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Electrochemical Evaluation of Pt-Based Binary Catalysts on Various Supports for the Direct Methanol Fuel Cell

机译：直接甲醇燃料电池不同载体上基于Pt的二元催化剂的电化学评估

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Multi-walled carbon nanotubes (MWCNTs), TiO2, MoO2, and carbon black Vulcan XC-72 were investigated as supports for PtRu and PtSn catalysts. X-ray diffraction (XRD) confirmed that all electrocatalysts examined display characteristic patterns similar to that of the Pt/C electrocatalyst, an indication that the catalysts have predominantly the Pt face-centered cubic (fcc) crystal structure. High-resolution transmission electron microscopy (HRTEM) images showed spherical PtRu and PtSn nanoparticles with a narrow particle size distribution, dispersed on the support materials. The metal loading for the prepared electrocatalyst was estimated using energy-dispersive X-ray spectroscopy (EDS), and it was observed to be closest to that of the catalysts supported on Vulcan XC-72. Cyclic voltammograms showed PtSn/C to be the most active, as it possessed a higher electroactive surface area than that of the other catalysts, followed by Pt/C > PtRu/MWCNT > PtRu/C > PtSn/MWCNT > PtSn/MoO2 > PtRu/MoO2 > PtSn/TiO2 > PtRu/TiO2. It was also observed that catalysts supported on MWCNTs were more active than those supported on metal oxides. Furthermore, catalysts supported on MWCNTs proved to be more stable than all the other supported catalysts examined. Therefore, MWCNTs have been proven in this study to be the best material for supporting electrocatalysts for direct methanol fuel cells.
机译：研究了多壁碳纳米管（MWCNT），TiO2，MoO2和炭黑Vulcan XC-72作为PtRu和PtSn催化剂的载体。 X射线衍射（XRD）证实，所检查的所有电催化剂均显示出与Pt / C电催化剂相似的特征图案，这表明该催化剂主要具有Pt面心立方（fcc）晶体结构。高分辨率透射电子显微镜（HRTEM）图像显示球形PtRu和PtSn纳米颗粒具有窄的粒径分布，分散在载体材料上。使用能量分散X射线光谱法（EDS）估算了制备的电催化剂的金属负载量，发现该负载量与负载在Vulcan XC-72上的催化剂最接近。循环伏安图显示PtSn / C具有最高的活性，因为它具有比其他催化剂更高的电活性表面积，其次是Pt / C> PtRu / MWCNT> PtRu / C> PtSn / MWCNT> PtSn / MoO2> PtRu / MoO2> PtSn / TiO2> PtRu / TiO2。还观察到，负载在MWCNT上的催化剂比负载在金属氧化物上的催化剂更具活性。此外，事实证明，负载在MWCNT上的催化剂比所有其他负载的催化剂都更稳定。因此，MWCNTs在这项研究中被证明是支持直接甲醇燃料电池电催化剂的最佳材料。

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