期刊
JOURNAL OF POWER SOURCES
卷 195, 期 11, 页码 3640-3644出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2009.12.025
关键词
Portable-power; Cathode flooding; Micro-fuel cell; Fuel cell system design; Wick
资金
- U.S. Army Research Office [W911NF-07-1-0258]
- NSF funded renewable energy materials research science and engineering center (NSF-REMRSEC)
In a typical air-breathing fuel cell design, ambient air is supplied to the cathode by natural convection and dry hydrogen is supplied to a dead-ended anode. While this design is simple and attractive for portable low-power applications, the difficulty in implementing effective and robust water management presents disadvantages. In particular, excessive flooding of the open-cathode during long-term operation can lead to a dramatic reduction of fuel cell power. To overcome this limitation, we report here on a novel air-breathing fuel cell water management design based on a hydrophilic and electrically conductive wick in conjunction with an electroosmotic (EO) pump that actively pumps water out of the wick. Transient experiments demonstrate the ability of the EO-pump to resuscitate the fuel cell from catastrophic flooding events, while longer term galvanostatic measurements suggest that the design can completely eliminate cathode flooding using less than 2% of fuel cell power, and lead to stable operation with higher net power performance than a control design without EC-pump. This demonstrates that active EC-pump water management, which has previously only been demonstrated in forced-convection fuel cell systems, can also be applied effectively to miniaturized (<5 W) air-breathing fuel cell systems. (C) 2009 Elsevier B.V. All rights reserved.
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