摘要
针对自呼吸微型直接甲醇燃料电池阴极氧气传质效率低和性能差等问题,对微型直接甲醇燃料电池阴极集流板多孔结构进行了设计和实验研究。通过建立甲醇燃料电池阴极模型,分析了集流板开孔形状和开孔率的变化对电池性能的影响,指出开孔形状对阴极电流几乎没有影响,开孔率在一定范围内变化时阴极电流变化较小。然后对得出的结果进行了实验验证。提出了一种具有平行沟道的阴极集流板多孔结构,通过对阴极氧气浓度、速度和电流密度的模拟仿真,说明了提出的结构可以有效改善氧气传质和提高电池性能。利用微精密加工技术实现了有效面积为8mm×8mm的自呼吸微型直接甲醇燃料电池,室温下测试显示,当甲醇溶液浓度为1mol/L,流速为1ml/min时,最大输出功率达到11mW/cm2,为便携式微能源系统的应用开发奠定了基础。
To solve the low efficiency of oxygen mass transport and weak performance of self-breathing micro-direct methanol fuel cells（μDMFCs）,the different cathode current collectors with a perforated structure were designed.Firstly,the effects of opening shapes and opening ratios on the cell performance were studied by establishing the cathode model of μDMFC,which indicates that the opening shapes have little effect on the cathode current density,and the variations of cathode current are rather small in the range of opening ratios.Then,experiments were performed to verify the simulations.Based on the above analysis,a cathode perforated structure with parallel channels was presented.Compared with conventional structures,the simulation results illustrate that the improved structure can effectively improve the oxygen mass transport to increase the cell performance.A self-breathing μDMFC with the active area of 8 mm×8 mm was fabricated on the stainless steel plates by utilizing micromachining technology.Test results show that the peak power density of the μDMFC is 11 mW/cm2 with methanol solution of 1 mol/L and speed of 1 ml/min at room temperature.In conclusion,the improved self-breathing cathode structure can be contribute to further development of portable micro power source systems.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2011年第4期820-827,共8页
Optics and Precision Engineering
基金
国家自然科学基金资助项目(No.60806037No.61076105)
教育部高校博士点基金资助项目(No.20102302110026)
中央高校基本科研业务费专项基金资助项目(No.HIT.NSRIF.2009008)
关键词
微型直接甲醇燃料电池
阴极集流板
自呼吸
平行沟道
Micro-direct Methanol Fuel Cell（μDMFC）
cathode current collector
self-breathing
parallel channels
