Dynamic Evaluation of Membrane-Electrode Assembly in Operation of a Direct Methanol Fuel Cell by Simultaneous Measurements of Crossovers of Methanol and CO2

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Kosuke Kamata¹  Nobuyoshi Nakagawa¹  Kazumasa Kobayashi¹  Yikun Xiu¹  Tsutomu Nakazato¹ 

[1] Department of Biological and Chemical Engineering, Gunma University

关键词: Methanol Crossover;    Carbon Dioxide Crossover;    Diffusion Mechanism;    Membrane Electrode Assembly;    Fuel Cell;   

DOI  :  10.1252/jcej.40.348

来源: Maruzen Company Ltd

【 摘 要 】

References(20)Cited-By(2)Simultaneous measurement of methanol crossover (MCO) at the anode and CO2 crossover (CCO) at the cathode is carried out for the proper evaluation of a membrane-electrode assembly (MEA) in operation of a direct methanol fuel cell (DMFC). The effects of temperature (293–363 K), concentration of methanol in aqueous solution (1–3 mol/dm3), current density (0–0.4 A/cm2) and gas/liquid flow rate and relative humidity of gas at the cathode on MCO and CCO fluxes are investigated. With an increase in the current density, the MCO flux linearly decreases, while the CCO flux increases to a certain value, and reaches 15% of MCO flux at high current density (0.4 A/cm2). The MCO flux is strongly affected by the methanol concentration, temperature and current density, and slightly affected by the gas/liquid flow rate. An empirical equation is proposed for the MCO flux through an MEA in operation of a DMFC under ambient pressure, where liquid methanol and dry oxygen are fed to the anode and cathode, respectively.

【 授权许可】

Unknown