A Comparative Study of the Catalytic Performance of Pt-Based Bi and Trimetallic Nanocatalysts Towards Methanol, Ethanol, Ethylene Glycol, and Glycerol Electro-Oxidation.
A Comparative Study of the Catalytic Performance of Pt-Based Bi and Trimetallic Nanocatalysts Towards Methanol, Ethanol, Ethylene Glycol, and Glycerol Electro-Oxidation.
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DOI：
10.1166/jnn.2020.18559
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发表时间：
2020-10
影响因子：
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通讯作者：
H. S. Ferreira;M. Gocyla;H. S. Ferreira;R. Araujo;C. Almeida;M. Heggen;R. Dunin‐Borkowski;K. Eguiluz;P. Strasser;Giancarlo Richard Salazar Banda
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文献类型：
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作者：
H. S. Ferreira;M. Gocyla;H. S. Ferreira;R. Araujo;C. Almeida;M. Heggen;R. Dunin‐Borkowski;K. Eguiluz;P. Strasser;Giancarlo Richard Salazar Banda
碳载铂在以低分子量醇为燃料的低温燃料电池中用作阳极和阴极电催化剂。Pt的成本及其对这些燃料的完全氧化的低活性是这些类型的燃料电池的广泛使用的显著障碍。在这里，我们报告的发展PtRhNi纳米催化剂支持碳使用还原化学方法与不同的原子速率。研究了所开发的催化剂对甲醇、乙醇、乙二醇和甘油在酸性介质中电氧化的催化活性。将所得催化剂与商品Pt/C和二元Pt 75 Ni 25/C催化剂进行了性能比较。的纳米结构进行了表征，采用电感耦合等离子体发射光谱仪，X射线衍射，扫描透射电子显微镜，和能量色散X射线光谱。二元催化剂呈现约2nm的平均粒度。而三元催化剂呈现相似尺寸的颗粒，并具有一些大的合金和核壳结构。使用计时电流法3600 s后测量的醇氧化起始电位和电流密度对催化剂对甲醇、乙醇、乙二醇和甘油的氧化的催化活性进行分类。最佳PtRhNi/C催化剂组合物（即，Pt 43 Rh 43 Ni 14/C催化剂对醇类的氧化活性最高，表明适当的组分调整对催化剂的活性有影响。Pt 43 Rh 43 Ni 14/C催化剂的催化活性增强是由于Pt、Ni和Rh三金属化合物的协同作用。
Carbon-supported platinum is used as an anode and cathode electrocatalyst in low-temperature fuel cells fueled with low-molecular-weight alcohols in fuel cells. The cost of Pt and its low activity towards the complete oxidation of these fuels are significant barriers to the widespread use of these types of fuel cells. Here, we report on the development of PtRhNi nanocatalysts supported on carbon made using a reduction chemistry method with different atomic rates. The catalytic activity of the developed catalysts towards the electro-oxidation of methanol, ethanol, ethylene glycol, and glycerol in acidic media was studied. The obtained catalysts performances were compared with both commercial Pt/C and binary Pt75Ni25/C catalyst. The nanostructures were characterized, employing inductively coupled plasma optical emission spectrometer, X-ray diffraction, scanning transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The binary catalyst presents a mean particle size of around 2 nm. Whereas the ternary catalysts present particles of similar size and with some large alloy and core-shell structures. The alcohol oxidation onset potential and the current density measured after 3600 s of chronoamperometry were used to classify the catalytic activity of the catalysts towards the oxidation of methanol, ethanol, ethylene glycol, and glycerol. The best PtRhNi/C catalyst composition (i.e., Pt43Rh43Ni14/C) presented the highest activity for alcohols oxidation compared with all catalysts studied, indicating the proper tuning composition influence in the catalytic activity. The enhanced activity of Pt43Rh43Ni14/C can be attributed to the synergic effect of trimetallic compounds, Pt, Ni, and Rh.