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首页> 外文期刊>International Journal of Electrochemical Science >Faradaic Efficiencies for Methanol Oxidation in Proton- Exchange Membrane Electrolysis and Fuel Cells with Various Anode Catalysts
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Faradaic Efficiencies for Methanol Oxidation in Proton- Exchange Membrane Electrolysis and Fuel Cells with Various Anode Catalysts

机译：质子交换膜电解和带有各种阳极催化剂的燃料电池中甲醇氧化的法拉第效率

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摘要

The energy efficiency of a direct methanol fuel cell (DMFC) is dependent on the cell voltage, crossoverof oxygen and/or methanol through the polymer electrolyte membrane, and stoichiometry of themethanol oxidation reaction (i.e., the average number of electrons transferred per methanol molecule(n av )). The stoichiometry is determined by the product distribution (carbon dioxide: formic acid:formaldehyde) and the amount of methanol consumed. The influence of crossover is investigated byusing air and N 2 at the cathode. Accurate determination of n av requires analysis of the methanol andproducts from both the anode and cathode and quantitative determination of the consumption ofmethanol. In this work, n av values obtained from the analysis of the cell exhausts by proton NMR andinfrared spectrometry are compared with values obtained from a simple electrochemical method basedon the dependence of the current on the flow rate of the methanol solution. The methodology presentedhere provides a comprehensive evaluation of methanol oxidation, along with a full determination of themethanol consumption and hence the fuel efficiency of the cell. The methods are suitable for rapidevaluation of catalysts in fuel cell hardware with low-cost online sensors for determination of productdistributions.
机译：直接甲醇燃料电池（DMFC）的能效取决于电池电压，氧气和/或甲醇穿过聚合物电解质膜的交叉以及它们的化学计量比（即每个甲醇分子转移的平均电子数（ n av））。化学计量由产物分布（二氧化碳：甲酸：甲醛）和消耗的甲醇量决定。通过在阴极处使用空气和N 2来研究交叉的影响。要准确测定n av，需要分析甲醇和阳极和阴极的产物，并定量测定甲醇的消耗量。在这项工作中，将通过质子NMR和红外光谱分析电池排气所获得的n av值与根据电流对甲醇溶液流速的依赖性从简单电化学方法获得的n av值进行比较。本文介绍的方法提供了对甲醇氧化的全面评估，并全面确定了它们的乙醇消耗量以及电池的燃料效率。该方法适用于通过低成本在线传感器快速评估燃料电池硬件中的催化剂，从而确定产品分布。

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