On-line Measurement for Ohmic Resistance in Direct Methanol Fuel Cell by Current Interruption Method

• Published in: Chinese journal of chemical engineering Vol. 18; no. 5; pp. 843 - 847
• Main Author: 刘敏 王金海 王树博 谢晓峰 周涛 V.K．Mathur
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2010
• Subjects: current interruption method; direct methanol fuel cell (DMFC); electrochemical impedance spectroscopy (EIS); membrane resistance; ohmic resistance; 中断法; 在线测量; 注册商标; 电化学阻抗谱; 电阻比; 直接甲醇燃料电池; 高电流密度; electrochemical impedance spectroscopy (EIS); direct methanol fuel cell (DMFC); current interruption method; ohmic resistance; membrane resistance
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/S1004-9541(09)60137-3

Electrochemical impedance spectroscopy （EIS） is widely used in fuel cell impedance analysis. However, for ohmic resistance （R Ω）, EIS has some disadvantages such as long test period and complex data analysis with equivalent circuits. Therefore, the current interruption method is explored to measure the value of RΩ in direct methanol fuel cells （DMFC） at different temperatures and current densities. It is found that RΩ decreases as temperature increase, and decreases initially and then increases as current density increases. These results are consistent with those measured by the EIS technique. In most cases, the ohmic resistances with current interruption （R iR ） are larger than those with EIS （R EIS ）, but the difference is small, in the range from –0.848% to 5.337%. The errors of R iR at high current densities are less than those of R EIS . Our results show that the R iR data are reliable and easy to obtain in the measurement of ohmic resistance in DMFC.