A fast start up system for microfluidic direct methanol fuel cells
A fast start up system for microfluidic direct methanol fuel cells
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DOI：
10.1016/j.ijhydene.2019.08.107
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发表时间：
2019-10
影响因子：
7.2
通讯作者：
J. Massing;N. van der Schoot;C. Kähler;C. Cierpka
中科院分区：
文献类型：
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作者：
J. Massing;N. van der Schoot;C. Kähler;C. Cierpka
对一种简单有效的微流控直接甲醇燃料电池加热系统进行了实验研究。它由纳米厚度的半导体氧化铟锡加热层组成，该加热层被施加到阳极和阴极盖板上并受到高电力的作用。仅在25秒内，膜附近的温度就达到了80摄氏度，这一点得到了实验验证。利用该系统，产生燃料电池的最大输出功率的90%以上所需的时间可以减少到20秒，从而克服了这种类型的燃料电池的大约几分钟的长启动时间的公知问题。此外，更深入地了解对流传热的作用。首次采用发光寿命成像和像散粒子跟踪测速技术同时测量了微流控直接甲醇燃料电池阳极通道内的三维速度和温度分布。实验结果表明，阳极流的冷却效果显著，而阴极流的影响很小。最后，各种可能的未来改进，以提高供热系统的效率。
A novel simple and effective heating system for microfluidic direct methanol fuel cells was characterized experimentally. It consisted of a semi-conductive indium tin oxide heating layer of nanometer thickness that was applied to the anode and cathode cover plates and subjected to high electrical power. Within only 25 s, temperatures of up to 80∘ C were reached in the vicinity of the membrane, which was verified experimentally. With this system the time needed to generate more than 90% of the maximum output power of the fuel cell can be reduced to 20 s, thus overcoming the well known problem of long start up times in the order of minutes of this type of fuel cells. Furthermore, deeper insight into the role of the convective heat transfer is given. For the first time simultaneous measurements of the three-dimensional velocity and temperature distributions within the anode channel of a microfluidic direct methanol fuel cell were performed by means of luminescence lifetime imaging and astigmatism particle tracking velocimetry. The experimental results prove a significant cooling effect of the anode flow, whereas the influence of the cathode flow is small. Finally, various possible future improvements to increase the efficiency of the heating system are identified.