Methanol crossover effect for direct methanol fuel cells: Applicability of methanol activity in polymer electrolyte membrane
- Authors
- Yang, Jung Ho; Bae, Young Chan
- Issue Date
- Jan-2008
- Publisher
- ELECTROCHEMICAL SOC INC
- Citation
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.155, no.2, pp.B194 - B199
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY
- Volume
- 155
- Number
- 2
- Start Page
- B194
- End Page
- B199
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/179087
- DOI
- 10.1149/1.2818782
- ISSN
- 0013-4651
- Abstract
- We developed a cell voltage model as a function of the current density response of the direct methanol fuel cell (DMFC). The impact on cell performance by methanol crossover, which lowers the cell performance, is discussed. We employ a srmethanol activity term to take into account the methanol crossover effect. A methanol activity equation is derived from the Helmholtz energy of mixing. In this study, we use a simplified expression of the Helmholtz energy of mixing and correct the mathematical approximation defect using the fractional form. To take the specific interaction into account, a secondary lattice concept, perturbation to a fixed reference system, is introduced. A cell voltage equation with reasonable boundary conditions, including a methanol crossover effect that plays a major role in determining the cell voltage of DMFC, is developed. It can also be found that the methanol crossover increases with an increase in membrane chain length.
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