Kim, D Lee, J Lim, TH Oh, IH Ha, HY 2024-01-21T03:05:39Z 2024-01-21T03:05:39Z 2021-09-01 2006-04-21 0378-7753 https://pubs.kist.re.kr/handle/201004/135569 The characteristics of a 50W direct methanol fuel cell (DMFC) stack were investigated under various operating conditions in order to understand the behavior of the stack. The operating variables included the methanol concentration, the flow rate and the flow direction of the reactants (methanol and air) in the stack. The temperature of the stack was autonomously increased in proportion to the magnitude of the electric load, but it decreased with an increase in the flow rates of the reactants. Although the operation of the stack was initiated at room temperature, under a certain condition the internal temperature of the stack was higher than 80 degrees C. A uniform distribution of the reactants to all the cells was a key factor in determining the performance of the stack. With the supply of 2 M methanol, a maximum power of the stack was found to be 54 W (85 MW cm(-2)) in air and 98 W (154 mW cm(-2)) in oxygen. Further, the system with counter-flow reactants produced a power output that was 20% higher than that of co-flow system. A post-load behavior of the stack was also studied by varying the electric load at various operating conditions. (c) 2005 Elsevier B.V. All rights reserved. English ELSEVIER METHANOL FUEL-CELL PERFORMANCE CROSSOVER DESIGN Operational characteristics of a 50 W DMFC stack Article 10.1016/j.jpowsour.2005.04.033 1 JOURNAL OF POWER SOURCES, v.155, no.2, pp.203 - 212 JOURNAL OF POWER SOURCES 155 2 203 212 scie scopus 000237003000014 2-s2.0-33645705991 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article METHANOL FUEL-CELL PERFORMANCE CROSSOVER DESIGN direct methanol fuel cell stack voltage distribution flow direction autonomous temperature load following