Mass spectroscopy for the anode gas layer in a semi-passive DMFC using porous carbon plate Part I: Relationship between the gas composition and the current density
Mass spectroscopy for the anode gas layer in a semi-passive DMFC using porous carbon plate Part I: Relationship between the gas composition and the current density
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DOI：
10.1016/j.jpowsour.2009.07.027
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发表时间：
2009-12
影响因子：
9.2
通讯作者：
M. S. Masdar;T. Tsujiguchi;N. Nakagawa
中科院分区：
文献类型：
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作者：
M. S. Masdar;T. Tsujiguchi;N. Nakagawa
采用毛细管探针对采用多孔碳板（PCP）的半被动直接甲醇燃料电池（DMFC）的阳极气体层进行了原位质谱分析，以评估与阳极接触的气体成分。将不同类型的磷酸钙用于直接甲醇燃料电池，然后研究气体层中的气体组成与电流密度之间的关系。在电流密度和阻力的基础上，讨论了CO2气体压力、甲醇和水蒸气压力的分布。电流密度随甲醇分压（[公式：见正文]）的增加而线性且相同地增加，在高达7.5 kPa的气体层中，与PCP的类型无关，这表明电流是[公式：见正文]的函数，并且它受到甲醇向阳极传输的速率限制。在最佳条件下，计算得到的液相甲醇浓度相当于气层中被测气体混合物的浓度约为5- 7 M。这证实了具有PCP的DMFC的阳极上的实际甲醇活性由PCP控制，并且即使当储液器中存在非常高浓度的甲醇时也与通常的液体进料DMFC的甲醇活性相似。
In situ mass spectroscopy with a capillary probe was conducted for the anode gas layer of a semi-passive direct methanol fuel cell (DMFC) employing a porous carbon plate (PCP) in order to evaluate the gas composition in contact with the anode. Different types of PCPs were used for the DMFC, and then the relationship between the gas composition in the gas layer and the current density was investigated. The profiles of the CO2gas pressure, methanol and water vapor pressures were discussed on the basis of the current density and the resistance for the methanol and CO2transport through the PCP. The current density linearly and identically increased with the increase in the partial pressure of methanol, [Formula: see text] , in the gas layer up to 7.5kPa irrespective of the type of the PCP suggesting that the current was a function of [Formula: see text] and it was rate limited by the methanol transport to the anode. The calculated liquid methanol concentration equivalent to the measured gas mixture in the gas layer was about 5–7M in the optimum conditions. This confirmed that the actual methanol activity on the anode of the DMFC with the PCP was controlled by the PCP and was similar to that of the usual liquid feed DMFC even when a very high concentration of methanol was in the reservoir.