运行条件对小型直接甲醇燃料电池性能影响  

Influence of operating conditions on performance of small direct methanol fuel cell

作　　者：岳鹿[1] 李伟善[1,2] 张庆龙[1] 李伟[1] 

机构地区：[1]华南师范大学化学与环境学院,广东广州510006 [2]广东高校电化学储能与发电技术重点实验室,广东广州510631

出　　处：《电源技术》2008年第10期677-680,共4页Chinese Journal of Power Sources

基　　金：国家自然科学基金资助(20573039);科技部国际科技合作重点项目计划(2005DFA60580);广东省攻关项目(2005B50101003)

摘　　要：采用转压法制作4cm2的膜电极,装配出小型直接甲醇燃料(DMFC)单体电池,对电池最佳运行条件进行实验研究。结果表明:电池经过70℃热水循环24h后性能基本稳定,电池的性能受温度和甲醇浓度影响较大。23℃时,用1.5mol/L甲醇溶液电池性能较好;在60℃时,用1.0mol/L甲醇溶液电池性能较好;80℃时,在低电流密度区,用0.2mol/L的甲醇溶液电池性能较好,在高电流密度区,用0.5mol/L的甲醇溶液电池性能较好。60℃工作温度下,电池运行所需要的最佳甲醇流速为1mL/min,最佳氧气流量为250mL/min。A miniature membrane-electrode assembly （MEA） with 4 cm^2 active area was fabricated by the catalyst coated membrane method.With this MEA,a single direct methanol fuel cell （DMFC） was prepared. The best operating conditions of this DMFC were investigated in detail. The results show that the cell performance is steady after being activated for 24 h in 70 ℃ hot water and depends on temperature and methanol concentration to a great extent. For example, the best methanol concentration is 1.5 mol/L at 23 ℃ and 1.0 mol/L at 60 ℃. At 80 ℃, better cell performance can be obtained with 0.2 mol/L methanol for low current density, but with 0.5 mol/L methanol for high current density. At 60℃, the best flow rate is 1.0 mL/min and 250 mL/min for methanol and oxygen, respectively.

关 键 词：直接甲醇燃料电池 小型化 运行条件 性能 极化曲线 

分 类 号：TM911.4[电气工程—电力电子与电力传动]