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High-precision identification of polarization processes of distribution of relaxation times by polarization curve model for proton exchange membrane fuel cell

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ENERGY CONVERSION AND MANAGEMENT 2022年 268卷

作者： Zhu, Dong Yang, Yanbo Pei, Fenglai Ma, Tiancai Tongji Univ Sch Automot Studies Shanghai 201804 Peoples R China Shanghai Motor Vehicle Inspect Certificat & Tech Shanghai 201804 Peoples R China

The distribution of relaxation times (DRT) is a promising impedance analysis method that is often used to decompose polarization processes with different time constants. However, uncertainty in interpreting polariza-tion processes by DRT arises from two main sources: (1) overlap of the DRT peaks and (2) lack of peak identi-fication methods. Thus, herein, a high-precision polarization process identification method based on polarization curve model involving electrochemical processes of proton exchange membrane fuel cell (PEMFC) was proposed by establishing the intrinsic relationship between polarization curve and electrochemical impedance spectros-copy (EIS) and comparing the quantitative relationship between the steady-state resistance obtained by the inverse slope of polarization curve model and each DRT peak. Then, an improved DRT method based on the characteristic frequency resolution optimization was suggested to avoid the overlap of the DRT peaks in case of the narrow interval time constants of the electrochemical system. Based on these two methods, each polarization resistance of PEMFC and DRT peak was quantitatively analyzed. First, it was determined that the total steady-state resistance has a resistance recovery compared to the low-frequency intercept resistance obtained by the improved DRT method, because of the ultra-low-frequency pseudo-inductive behavior arising mainly from dis-solved water transport. Second, the peak with a characteristic frequency in the range of 7-54 Hz corresponds to two processes: mass transport and dissolved water transport. The peak with a characteristic frequency in the range of 3-20 Hz represents charge transfer. Interestingly, the two DRT peaks in the low-frequency region overlapped at 400 mA cm-2 because their characteristic frequencies changed in opposite directions with the current density. Moreover, the peak with a high characteristic frequency in the range of 250-300 Hz corresponds to proton transport of the catalyst laye

关键词： Proton exchange membrane fuel cell polarization curve model Characteristic frequency resolution Electrochemical impedance spectroscopy Distribution of relaxation times

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A comprehensive review on modelling and maximum power point tracking of PEMFC

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Cleaner Energy Systems 2022年 3卷

作者： George, Sunitha Sehgal, Nitish Rana, K.P.S. Kumar, Vineet Instrumentation and Control Engineering Department Netaji Subhas University of Technology Sector-3 Dwarka New Delhi 110078 India

Working of Proton Exchange Membrane Fuel Cell (PEMFC) can be described using Dynamic Gas Transport model or polarization curve model. Majorly, researchers have employed the latter for investigations on control applications. To carry out scientific advancements, one requires a suitable model of PEMFC for theoretical studies. In this review, several observed issues in recently reported works on the modeling of PEMFC are presented. After examining the modeling issues, the correct model of PEMFC with its detailed theoretical basis is derived. Further, to extract maximum power from PEMFC, one needs to employ a Maximum Power Point Tracking (MPPT) technique. Over time, many MPPT techniques for various applications have been reported. It was felt that a comprehensive review is required to allow the researchers to compare and choose the appropriate MPPT technique for a particular application. Therefore, various applicable MPPT techniques are reviewed and valuable outcomes have been drawn based on the significant parameters used to estimate the performance of a method. Therefore, this review paper has two following contributions to make. First, to provide the correct model of PEMFC, and second, to offer a comprehensive review of MPPT techniques. Further, based on the presented extensive review, this paper also provides future research directions and background for applying suitable MPPT techniques to utilize PEMFC efficiently. © 2022 The Authors

关键词： Dynamic Gas Transport model MPPT Control Techniques PEMFC PEMFC Applications polarization curve model

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