Laminar flow-based micro fuel cell utilizing grooved electrode surface
Laminar flow-based micro fuel cell utilizing grooved electrode surface
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DOI：
10.1016/j.jpowsour.2014.06.005
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发表时间：
2014-12
影响因子：
9.2
通讯作者：
Seung-Mo Ha;Y. Ahn
中科院分区：
文献类型：
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作者：
Seung-Mo Ha;Y. Ahn
微流体燃料电池由于反应耗尽区的产生而具有低功率密度和差的燃料利用率。在这项研究中，电池电极图案化的凹槽提出了被动控制的耗尽区，其中的二次运输流的凹槽电极pushes耗尽层。所提出的无膜燃料电池是由在光致抗蚀剂微通道壁上的聚二甲基硅氧烷层和包含铂电极的玻璃基板组成。基于计算流体动力学模拟，设计了最佳的电极间隙和沟槽高度。过氧化氢既可用作燃料（与氢氧化钠混合时），也可用作氧化剂（与硫酸混合时）。在实验过程中，不同长度的电极被集成在Y通道的底部。实验结果表明，槽对电池性能的影响与燃料比和燃料浓度无关，但当电极长度较大时，槽对电池性能的影响显著。与平面电极相比，沟槽电极的峰值功率密度提高了最大13.93%。这种槽形电极燃料电池有望成为一种有用的微型发电装置。
Microfluidic fuel cells have low power density and poor fuel utilization due to the generation of a reaction depletion zone. In this study, cell electrodes patterned with grooves are proposed for passive control of the depletion zone, where a secondary transport flow over the grooved electrode replenishes the depleted layers. The proposed membrane-less fuel cell is composed of a polydimethylsiloxane layer over a photoresist microchannel wall and a glass substrate that contains platinum electrodes. The optimum gap between the electrodes and the height of grooves are designed based on a computational fluid dynamics simulation. Hydrogen peroxide is used both as a fuel (when it is mixed with sodium hydroxide) and as an oxidant (when it is mixed with sulfuric acid). During the experiments, electrodes of various lengths are integrated on the bottom of the Y-channel. Experimental results show that the effect of grooves on cell performance is independent of fuel rate and fuel concentration, but the effect is remarkable when the length of the electrode is large. The peak power density with grooved electrodes improves by a maximum of 13.93% compared to that of planar electrodes. This grooved electrode-based fuel cell is expected to be a useful microdevice for power generation.