Relation between water adsorption in polymer-electrolyte fuel cell and its electric power
Relation between water adsorption in polymer-electrolyte fuel cell and its electric power
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DOI：
10.1016/j.enconman.2013.03.023
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发表时间：
2013-07
影响因子：
10.4
通讯作者：
S. Fukada;Kazuto Ohba;Atsushi Nomura
中科院分区：
文献类型：
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作者：
S. Fukada;Kazuto Ohba;Atsushi Nomura
吸附在安装在聚合物电解质燃料电池（PEFC）系统内的Nafion117膜上的H2O的量被确定为温度和H2O蒸气压的函数。它的实验值与电流和终端电压的产品时，阳极和阴极室提供部分潮湿（0%至90%的相对湿度）的H2和O2气体在大气压下，分别。在水蒸气压低于2×104Pa的条件下，安装在PEFC组件内部的膜上的水吸附量与未安装在电池内部的非固定无力条件下测得的水吸附量接近。但当水蒸气压大于2×104Pa时，吸附量比自由状态下的吸附量小。在较高的蒸气压下，在安装状态下产生的电力也变得低于根据未固定状态下的吸附量预期的值。因此，实验表明，FC功率与膜上吸附的H2O的量密切相关。H2O吸附量取决于是否通过外部模具在FC中压缩。
The amount of H2O adsorbed on a Nafion® 117 membrane mounted inside a polymer-electrolyte fuel cell (PEFC) system is determined as a function of temperature and H2O vapor pressure. Its experimental values are related with a product of electric current and terminal voltage when the anode and cathode compartments are supplied with partially moist (0% to 90% in relative humidity) H2and O2gases at atmospheric pressure, respectively. Under conditions of H2O vapor pressure lower than 2×104Pa, the amount of H2O adsorbed on the membrane mounted inside the PEFC module is near to its original one that was determined under an unfixed force-free condition, where it is not mounted in cell. However, under conditions of H2O vapor pressure higher than 2×104Pa, the adsorption amount under the mounted state becomes smaller than its original value determined under the unfixed force-free state. At the higher vapor pressure, the electric power generated under the mounted state also becomes lower than its value expected from the adsorption amount under the unfixed state. Thus, it is experimentally clarified that the FC power is deeply related with the amount of H2O adsorbed on the membrane. The H2O adsorption amount depends on whether it is compressed in a FC by an outside mold or not.