Abstract
Abstract >> A lightweight 200W direct methanol fuel cell (DMFC) stack is designed and fabricated to powera small scale Unmanned Aerial Vehicle (UAV). The DMFC stack consists of 33-cells in which membrane-electrodeassemblies (MEAs) having an active area of 88 cm 2 are sandwiched with lightweight composite bipolar plates.The total stack weight is around 3.485 kg and stack performance is tested under various methanol feed concentrations. The DMFC stack delivers a maximum power of 248 W at 13.2 V and 71.3℃ under methanol feed concentrationof 1.2 M. In addition, the voltage of individual cell in the 33-cell stack is measured at various current levelsto ensure the stability of DMFC stack operations. The cell voltage distribution data exhibit the maximum cell voltage deviation of 28 mV at 15 A and hence the uniformity of cell voltages is acceptable. These results clearlydemonstrate that DMFC technology becomes a potential candidate for small-scale UAV applications. Key words : Direct methanol fuel cell, DMFC(직접메탄올연료전지), Unmanned aerial vehicle, UAV(무인비행기),Fuel cell stack(연료전지 스택), Methanol crossover(메탄올 크로스오버)
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