摘要
通过调控2种碳材料科琴黑[Ketjen Black EC-600JD(KB)]和黑珍珠[Black Pearls 2000(BP)]的比例,优化了室温下空气"自呼吸"式直接甲醇燃料电池膜电极集合体阴极微孔扩散层的孔结构,提高了氧气在阴极的传质,避免了液态水在阴极的累积。实验结果表明,阴极微孔扩散层中BP的添加对电池性能有较大的影响。当阴极微孔扩散层中的KB和BP碳材料以质量比9∶1混合时,25℃、空气"自呼吸"条件下,直接甲醇燃料电池的最大功率密度达20.8×10-3W/cm2,电池具有好的稳定性。高的功率密度和好的稳定性可归属于少量BP的添加改善了阴极微孔扩散层的孔结构。
By adjusting the proportion of Ketjen black EC-600JD （KB） and Black pearls 2000 （BP）, the optimal pore structure of the cathode mieroporous diffusive layer of an air-breathing direct methanol fuel cell （DMFC） can be obtained, which improves the mass transfer of oxygen and avoids the water flooding within the cathode. The experimental results show that the addition of BP in the cathode diffusive layer has a significant influence on DMFC＇s performance. When the mass ratio of KB and BP is ca. 9： 1, an air-breathing DMFC at a temperature of 25 ℃ exhibits the highest power density of 20. 8 × 10^ -3 W/cm^2 with the best stability. It is believed that the enhanced power density and improved stability of the DMFC could be ascribed to an improvement in cathode porous structure due to the addition of small amounts of BP.
出处
《应用化学》
CAS
CSCD
北大核心
2009年第2期135-139,共5页
Chinese Journal of Applied Chemistry
基金
国家科技部“八六三”计划(2006AA05Z136,2006AA04Z342,2007AA05Z141)
国家自然科学基金(20673136,20706056)
中国科学院“百人计划”择优支持
上海浦江计划(06PJ14110)
关键词
直接甲醇燃料电池
空气“自呼吸”
阴极微孔层
阴极水管理
膜电极集合体
direct methanol fuel cell, air-breathing, cathode microporous layer, cathode water management, membrane electrode assembly
