Trimetallic amorphous catalyst with low amount of platinum: Comparative study for ethanol, bioethanol and CO electrooxidation
Trimetallic amorphous catalyst with low amount of platinum: Comparative study for ethanol, bioethanol and CO electrooxidation
复制标题
低铂量三金属非晶态催化剂：乙醇、生物乙醇和CO电氧化的比较研究
DOI：
10.1016/j.ijhydene.2013.05.168
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发表时间：
2014
影响因子：
7.2
通讯作者：
N. Ruiz
中科院分区：
文献类型：
--
作者：
J. Barroso;A. R. Pierna;T. C. Blanco;N. Ruiz
乙醇和生物乙醇的使用证明了汽油替代燃料的可行性，并具有最佳的能源用途。开发合适的催化剂是提高直接醇类燃料电池（DAFC）电性能的基础。为此，采用机械合金化（MA）方法制备了一系列添加三种不同过渡金属（Y，Z = Cu，Ru和Sn）的非晶Ni 59Nb 40 Pt 0.6Y 0.2Z 0.2（PtYZ）合金。使用电化学技术，如循环伏安法（CV），计时电流法和CO汽提实验的低量的Pt和双功能电子的助催化剂的作用进行了分析。对于醇的电氧化反应，含Cu的合金表现出最好的催化性能。然而，它的使用受到Cu在酸性介质中溶解的限制。PtYZ催化剂表现出更高的CO耐受性，PtRuSn合金实现更小的中毒率（δ）。CO剥离表明，CO氧化与Ru合金发生在较低的电极电位。实验结果表明，该催化剂具有较好的电性能，但对生物乙醇的电氧化有较高的催化表面中毒率。高效液相色谱法检测到生物乙醇中存在乙醛和甲酸，影响了电化学响应。
The use of ethanol and bioethanol demonstrates the viability of alternative fuels to gasoline with optimum energy purposes. The development of suitable catalysts is fundamental to improve the electrical performance in Direct Alcohol Fuel Cells (DAFCs). For that reason, a series of amorphous Ni59Nb40Pt0.6Y0.2Z0.2(PtYZ) alloys adding three different transition metals (Y, Z = Cu, Ru and Sn) were manufactured by Mechanical Alloying (MA) method. The low amount of Pt and bifunctional-electronic role of cocatalysts was analyzed using electrochemical techniques such as Cyclic Voltammetry (CV), chronoamperometry and CO stripping experiments. Concerning to reactivity towards alcohol electrooxidations, alloys with Cu showed the best catalytic performance. However, its use is limited by Cu dissolution in acid media. The PtYZ catalysts showed higher CO tolerance, achieving smaller rates of poisoning (δ) for PtRuSn alloy. CO stripping reveals that CO oxidation on alloys with Ru takes place at lower electrode potentials. The experimental results showed better electric performance, but higher poisoning of the catalytic surface for bioethanol electrooxidation. Acetaldehyde and formic acid were found in bioethanol by HPLC, influencing the electrochemical response.