Effect of water concentration in the anode catalyst layer on the performance of direct methanol fuel cells operating with neat methanol
Effect of water concentration in the anode catalyst layer on the performance of direct methanol fuel cells operating with neat methanol
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DOI：
10.1016/j.ijhydene.2011.12.111
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发表时间：
2012-04
影响因子：
7.2
通讯作者：
Qixing Wu;S. Shen;Yaling He;T. Zhao
中科院分区：
文献类型：
--
作者：
Qixing Wu;S. Shen;Yaling He;T. Zhao
本文报道了一种基于色谱的直接甲醇燃料电池（DMFC）阳极催化层（CL）中水浓度的测定方法。通过该方法，在纯甲醇直接甲醇燃料电池中，研究了阳极CL中水浓度对甲醇氧化反应产物分布（莫尔）、阳极电位和电池内阻的影响.有趣的是，发现即使当阳极CL中的水浓度极低时，阳极莫尔的主要产物仍然是二氧化碳。实验数据还表明，在阳极CL中的水浓度的增加降低了内部电阻，副产物（甲酸甲酯和甲缩醛）的生产，和阳极电位。然而，当水与甲醇的摩尔比增加超过临界值时，内阻和阳极电位都趋于稳定在稀甲醇操作条件下的点处。
This paper reports on a chromatography-based method for determining the water concentration in the anode catalyst layer (CL) of a direct methanol fuel cell (DMFC). By this method, the effect of the water concentration in the anode CL on the product distribution of the methanol oxidation reaction (MOR), the anode potential, and the cell internal resistance is experimentally investigated in a DMFC operating with neat methanol. Interestingly, it is found that the main product of the anode MOR is still carbon dioxide even when the water concentration in the anode CL is extremely low. The experimental data also show that an increase in the water concentration in the anode CL decreases the internal resistance, the production of by-products (methyl formate and methylal), and the anode potential. As the mole ratio of water to methanol increases beyond a critical value, however, both the internal resistance and the anode potential tend to be stabilized at the points under diluted methanol operating conditions.