Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 43, Issue 30, Pages 13999-14011Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2017.11.029
Keywords
High temperature direct methanol fuel cells; Phosphoric acid; Methanol crossover; Polybenzimidazole (PBI); Numerical model
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Funding
- Technology Innovation Program (Development of Fuel Cell Technology for Charging Secondary Battery in Extreme Environment) - Ministry of Trade, Industry & Energy (MI, Korea) [20143030031330]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20174030201500]
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The high temperature-direct methanol fuel cell (HT-DMFC) based on phosphoric acid (PA) doped polybenzimidazole (FBI) membranes shows promise as a passive-type DMFC system because it can operate using highly concentrated methanol fuel. In this paper, the methanol crossover and cell performance behaviors of the HT-DMFCs were investigated using a one-dimensional (1-D) HT-DMFC system model that fully accounts for the electrochemical reactions, key species transport and heat generation inside a cell, and the evaporation processes of liquid methanol/water fuel in the evaporator. The model was first validated against experimental HT-DMFC data measured over a wide range of methanol feed concentrations and operating current densities, and operating characteristics of HT-DMFCs were then explored in detail. Particular emphasis was placed on conducting a comparative study of HT-DMFCs with traditional liquid feed low temperature-DMFCs based on perfluorosulfonic acid membranes. The simulation results showed that a HT-DMFC can operate well under highly concentrated methanol fuel above 12 M due to the minimal degree of methanol crossover through the PA-doped PBI membrane. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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