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Investigation of real-time changes and recovery of proton exchange membrane fuel cell in voltage reversal

机译：对电压反转中质子交换膜燃料电池实时变化及恢复的研究

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Hydrogen starvation at the anode of a proton exchange membrane fuel cell (PEMFC) causes cell voltage reversal followed by water electrolysis and carbon corrosion due to an increasing anode voltage. This study designed a set of online testing methods in different regions to take a closer look at the real-time changes of the internal current density and local temperature during the voltage reversal process. Mass spectrometer is used to test the anode tail gas to quantitatively characterize the progress of the reversal. Local Electrochemical Impedance Spectroscopy (Local EIS) and local Pt shedding before and after the reversal are innovatively performed to analyze the performance degradation of the fuel cell in different regions. In addition, the performance of fuel cell before and after the recovery process after the reversal is analyzed. Results show that the carbon corrosion in the outlet region of the reversal anode is the most severe, and the temperature at the inlet region due to the consumption of residual hydrogen is the highest. Compared with the inlet region, the Pt loss and High-Frequency Resistance (HFR) increase in the outlet is more serious. The process of performance recovery after reversal can make the current density distribution in fuel cell more uniform. Besides, the recovery process conducts a more positive impact on fuel cell outlet region than on inlet region. Data of mass spectrometer prove that water electrolysis and carbon corrosion disappear in the second reversal process, and then appear again in the third reversal process due to the performance recovery process.
机译：质子交换膜燃料电池（PEMFC）的阳极处的氢饥饿导致电池电压反转，然后由于阳极电压的增加而导致水电解和碳腐蚀。本研究在不同地区设计了一组在线测试方法，仔细研究内部电流密度和局部温度的实时变化在电压反转过程中。质谱仪用于测试阳极尾气，以定量表征反转的进度。局部电化学阻抗光谱（局部EIS）和逆转前后的局部PT脱落是创新性的，以分析不同地区燃料电池的性能下降。此外，分析了逆转后恢复过程前后燃料电池的性能。结果表明，逆转阳极的出口区域中的碳腐蚀是最严重的，并且由于残留氢的消耗导致的入口区域的温度最高。与入口区域相比，出口的PT损耗和高频电阻（HFR）增加更严重。逆转后性能恢复过程可以使燃料电池中的电流密度分布更均匀。此外，回收过程对燃料电池出口区域进行比入口区域更积极的影响。质谱仪数据证明，水电解和碳腐蚀在第二个反转过程中消失，然后由于性能恢复过程，在第三逆转过程中再次出现。

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