第19卷第4期 2011年4月
文章编号
1004-924X(2011)04-082008
光学精密工程
Optics and Precision Engineering
Vol.19No. 4
Apr.2011
微型直接甲醇燃料电池阴极集流板多孔结构设计
张鹏"，张宇峰1.2，张博，刘晓为1,2
（1.哈尔滨工业大学MEMS中心，黑龙江哈尔滨150001；
2.哈尔滨工业大学微系统与微结构制造教育部重点实验室，黑龙江哈尔滨150001）
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间题，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11 mW/cm"，为便携式微能源系统的应用开发奠定了基础，
关键
调：微型直接甲醇燃料电池；明极集流板；自呼吸；平行沟道
中图分类号：TM911.4
文献标识码：A
doi;10.3788/OPE,20111904.0820
Design of perforated structures of cathode current collectors
inmicro-directmethanolfuelcells
ZHANG Peng', ZHANG Yu-feng-, ZHANG Bo', LIU Xiao-weil-2
(I.MEMSCenter,HarbinInstituteofTechnology,Harbin150001,China, 2.Key Laboratory of Micro-systems and Micro-structures Manufacturing, MinistryofEducation,HarbinInstituteofTechnology,Harbin15o0ol,China)
Abstract: 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 perform-ance 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 rath-er 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 mmX 8 mm was fabricated on the stainless steel plates by utilizing
收稿日期：2010-08-08；修订日期：2010-08-26.
基金项目：国家自然科学基金资助项目（No.60806037；No.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）