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

作　　者：刘敏 王金海 王树博 谢晓峰 周涛 V.K.Mathur 

机构地区：[1]College of Chemistry and Chemical Engineering, Central South University.Changsha 410083, China [2]Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China [3]Department of Chemical Engineering, University of New Hampshire, NH 03824, USA

出　　处：《Chinese Journal of Chemical Engineering》2010年第5期843-847,共5页中国化学工程学报（英文版）

基　　金：Supported by the National High Technology Research and Development Program of China （2007AA05Z150）; the National Natural Science Foundation of China （50911140287 50973055）

摘　　要：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.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.

关 键 词：direct methanol fuel cell （DMFC） ohmic resistance current interruption method electrochemical impedance spectroscopy （EIS） membrane resistance 

分 类 号：TM911.4[电气工程—电力电子与电力传动] TQ114.262[化学工程—无机化工]