EFFECTS OF Mg2+ CONTAMINANT AT CATHODE ON PEMFC ELECTROCHEMICAL PERFORMANCE AND ELECTROCHEMICAL IMPEDANCE

Xu Lifeng; Tan Jinzhu; Li Yihuizi; Zhu Jingyu; Hou Qiong; Wei Yanqiang

doi:10.19912/j.0254-0096.tynxb.2022-1728

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (3) : 269-276. DOI: 10.19912/j.0254-0096.tynxb.2022-1728

EFFECTS OF Mg²⁺ CONTAMINANT AT CATHODE ON PEMFC ELECTROCHEMICAL PERFORMANCE AND ELECTROCHEMICAL IMPEDANCE

Xu Lifeng, Tan Jinzhu, Li Yihuizi, Zhu Jingyu, Hou Qiong, Wei Yanqiang

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Abstract

During long-term operation, the components （such as bipolar plates and elastomeric gaskets）of proton exchange membrane fuel cell （PEMFC） may degrade and produce the metal ion contaminants （e.g. Ca²⁺, Mg²⁺）. This could affect the long-term stability and durability of the PEMFC for its applications. In this paper, polarization curves and electrochemical impedance spectroscopy （EIS） were investigated experimentally by introducing the various concentration （i.e. 100 mg/L, 300 mg/L and 500 mg/L） Mg²⁺ solutions into the cathode air stream of the PEMFC, and then the effects of Mg²⁺ contaminant at the cathode on the PEMFC electrochemical performance and electrochemical impedance were analyzed. The polarization curve results show that the cathodic Mg²⁺ contaminant with three levels of concentrations had significantly negative effects on the electrochemical performance of the fuel cell, the current density of the fuel cell contaminated by Mg²⁺ decreased, and the current density decreased more drastically with the increase of Mg²⁺ concentration and contamination time. The theoretical analysis results of polarization curves indicate that the cathodic Mg²⁺ contaminant with three levels of concentrations could affect the permeability of the proton exchange membrane and increase the H⁺ impedance in the proton exchange membrane, and the performance of the proton exchange membrane deteriorated more severely with the increase of contamination time. The EIS results show that the cathodic Mg²⁺ contaminant with three levels of concentrations could increase the H⁺ impedance in the proton exchange membrane and the cathode Faraday resistance, and the H⁺ impedance in the proton exchange membrane and cathode Faraday resistance increase with the increase of contamination time, and the cathode electric double-layers are not significantly affected by the Mg²⁺ contaminant at the cathode in this work.

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proton exchange membrane fuel cells / magnesium ions / electrochemical impedance spectroscopy / electrochemical performance

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Xu Lifeng, Tan Jinzhu, Li Yihuizi, Zhu Jingyu, Hou Qiong, Wei Yanqiang. EFFECTS OF Mg²⁺ CONTAMINANT AT CATHODE ON PEMFC ELECTROCHEMICAL PERFORMANCE AND ELECTROCHEMICAL IMPEDANCE[J]. Acta Energiae Solaris Sinica. 2024, 45(3): 269-276 https://doi.org/10.19912/j.0254-0096.tynxb.2022-1728

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