| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent degradation of characteristics of a direct methanol fuel cell and obtain operating conditions and quality control for stably generating power for a ling period of time. <P>SOLUTION: Elution of a fuel electrode material to fuel is monitored in the direct methanol fuel cell 2. The elution is caused by an elution of perfluorosulfonic acid polymer in a fuel electrode into fuel in the case of high-density fuel of 2 M or more at an operating temperature of 80°C or more, which makes electrode catalyst elute into the fuel and deteriorate the characteristics. The elution is prevented by limiting fuel density to less than 2 M, and the operating temperature to 80°C or less, and elution characteristics are evaluated at manufacturing of the fuel cell to effect a quality control. Further, presence of the elution is detected from a color of the fuel or the like, and if detected, an upper limit of the operating temperature and the fuel density is lowered to prevent further elution. With this, elution of the fuel electrode material is prevented to improve durability of the direct methanol fuel cell 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
