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

›› 2010, Vol. 18 ›› Issue (5): 843-847.

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

刘敏^1,2, 王金海², 王树博², 谢晓峰², 周涛¹, V.K.Mathur³

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

收稿日期:2010-04-06 修回日期:2010-06-22 出版日期:2010-10-28 发布日期:2010-10-28
通讯作者: ZHOU Tao,E-mail:xiexf@tsinghua.edu.cn;zhoutao@mail.csu.edu.cn
基金资助:
Supported by the National High Technology Research and Development Program of China (2007AA05Z150);the National Natural Science Foundation of China (50911140287, 50973055)

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

LIU Min^1,2, WANG Jinhai², WANG Shubo², XIE Xiaofeng², ZHOU Tao¹, V. K. Mathur³

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

Received:2010-04-06 Revised:2010-06-22 Online:2010-10-28 Published:2010-10-28
Supported by:
Supported by the National High Technology Research and Development Program of China (2007AA05Z150);the National Natural Science Foundation of China (50911140287, 50973055)

摘要/Abstract

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 R_Ω in direct methanol fuel cells (DMFC) at different temperatures and current densities. It is found that R_Ω 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

Abstract: 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 R_Ω in direct methanol fuel cells (DMFC) at different temperatures and current densities. It is found that R_Ω 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.

Key words: direct methanol fuel cell (DMFC), ohmic resistance, current interruption method, electrochemical impedance spectroscopy (EIS), membrane resistance

刘敏, 王金海, 王树博, 谢晓峰, 周涛, V.K.Mathur. On-line Measurement for Ohmic Resistance in Direct Methanol Fuel Cell by Current Interruption Method[J]. , 2010, 18(5): 843-847.

LIU Min, WANG Jinhai, WANG Shubo, XIE Xiaofeng, ZHOU Tao, V. K. Mathur. On-line Measurement for Ohmic Resistance in Direct Methanol Fuel Cell by Current Interruption Method[J]. , 2010, 18(5): 843-847.

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

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

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