On the electrochemical impedance spectroscopy of direct methanol fuel cell |
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Authors: | Chien-Ming Lai Jing-Chie Lin Kan-Lin Hsueh Chiou-Ping Hwang Keh-Chyun Tsay Li-Duan Tsai Yu-Min Peng |
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Affiliation: | 1. Department of Mechanical Engineering/Institute of Materials Science and Engineering, National Central University, No. 300 Jhongda Road, Jhongli City, Taoyuan County 320, Taiwan;2. Materials Research Laboratories, Industrial Technology Research Institute, Building 77, 195-5 Chung Hsing Road, Section 4, Chutung, Hsinchu 310, Taiwan |
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Abstract: | The direct methanol fuel cell (DMFC) was operated under a variety of current densities to monitor the electrochemical impedance spectroscopy (EIS) for understanding its reaction mechanism. Based on the EIS analysis, the impedance of the cell reaction is divided into three components, two of them are current dependent and the remainder is current independent. Through detailed exploration of the impedance components, the high-frequency impedance was attributed to interfacial behavior, the medium-frequency impedance to electrochemical reactions, and the low-frequency impedance to the adsorption/relaxation of CO. Based on EIS analysis, a qualitative model is proposed to delineate the reaction mechanisms of DMFC, which is confirmed quantitatively by one set of equivalent circuit elements. The experimental data are satisfactorily consistent with the results simulated from the proposed model. |
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Keywords: | Electrochemical impedance spectroscopy Direct methanol fuel cell Membrane electrode assembly Equivalent circuit elements Interfacial impedance |
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