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Performance Characteristics of Direct Methanol Fuel Cell with Methanol Concentration  

Cho, Chang-Hwan (Department of Mechanical Engineering, Korea University)
Kim, Yong-Chan (Department of Mechanical Engineering, Korea University)
Chang, Young-Soo (Korea Institute of Science and Technology)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.20, no.3, 2008 , pp. 197-204 More about this Journal
Abstract
DMFC(Direct Methanol Fuel Cell) is one of promising candidates for power sources of small mobile IT devices like notebook, cell phone, and so on. Efficient operation of fuel cell system is very important for long-sustained power supply because of limited fuel tank size. It is necessary to investigate operation characteristics of fuel cell stack for optimal control of DMFC system. The generated voltage was modeled according to various operating condition; methanol concentration, stack temperature, and load current. It is inevitable for methanol solution at anode to cross over to cathode through MEA(membrane electrode assembly), which reduces the system efficiency and increases fuel consumption. In this study, optimal operation conditions are proposed by analyzing stack performance model, cross-over phenomenon, and system efficiency.
Keywords
Direct methanol fuel cells; System efficiency; Static model; Crossover;
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