Reaction analysis of a direct methanol fuel cell employing a porous carbon plate operated at high methanol concentrations
Reaction analysis of a direct methanol fuel cell employing a porous carbon plate operated at high methanol concentrations
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DOI：
10.1016/j.jpowsour.2008.09.117
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发表时间：
2009-01-01
影响因子：
9.2
通讯作者：
Noda, Reiji
中科院分区：
文献类型：
--
作者：
Nakagawa, Nobuyoshi;Sekimoto, Kazuya;Noda, Reiji
众所周知，直接甲醇燃料电池(DMFC)会排放少量的中间产物，如甲醛、甲酸等。这些中间体的产率受阳极上的甲醇和水浓度的影响，而且这些产物的分布也是不同的。我们研究了含多孔碳板(PCP)的被动式直接甲醇燃料电池(PCP)的中间产物的产生，由于多孔碳板(PCP)对甲醇传输的高阻性，它允许在高浓度下使用高达100%的甲醇。不仅测量了使用不同传输阻力的PCP的DMFC的中间产物的产率及其分布，也测量了不使用PCP的DMFC的中间产物的生成速度和分布。检测到的中间体为甲醛。甲酸和甲酸甲酯，与以前的报告一致。中间产物的产率强烈地依赖于MCO的通量，而不是表观甲醇浓度。当DMFC运行在PCP传输甲醇的限速条件下时，中间产物的产率较低。但在限速条件外操作时，产率随甲醇穿透速率的增加而增加。(C)2008爱思唯尔B.V.保留所有权利。
It is known that a small amount of intermediate products, i.e., formaldehyde, formic acid and so on, is exhausted from a direct methanol fuel cell (DMFC). The production rates of such intermediates are affected by the methanol and water concentrations at the anode, and also the distribution of these products is variable. We investigated the production of the intermediates from a passive DMFC containing a porous carbon plate (PCP), which allows the use of methanol at high concentrations up to 100% due to the high resistivity to the methanol transport through the PCR The production rates of each intermediate and their distribution were measured not only for a DMFC employing various PCPs with different transportation resistivities, but also for a DMFC without PCR The results were analyzed in terms of the rate of methanol crossover (MCO) and water flux through the membrane. The detected intermediates were formaldehyde. formic acid, and methylformate, in accordance with previous reports. The production rates of the intermediates were strongly dependent on the flux of the MCO rather than the apparent methanol concentration. When the DMFC was operated under the rate limiting conditions of the methanol transport by the PCP, the production rates of the intermediates were low. However, when it was operated outside of the rate limiting conditions, the production rate increased with the increasing rate of methanol crossover. (c) 2008 Elsevier B.V. All rights reserved.