Observation of flooding-induced performance enhancement in PEMFCs

Choi, Heesoo; Kim, Jaeyeon; Kwon, Obeen; Yoo, Hongnyoung; Kim, Hyeok; Cha, Hyeonjin; Park, Taehyun

doi:10.1016/j.ijhydene.2021.11.234

Cited by 22 publications

(4 citation statements)

References 29 publications

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“…The measurement of 0.96 V using a 1.46 umthick Ag current collecting layer cell was relatively lower than other OCVs. However, a number of prior studies showed around 1.0 V of OCVs [2,3,[5][6][7][16][17][18][19][20]. This is because of the inherent hydrogen permeability of Nafion ® , PTFE gaskets, etc.…”

Section: Resultsmentioning

confidence: 98%

Effects of Ag Current Collecting Layer Fabricated by Sputter for 3D-Printed Polymer Bipolar Plate of Ultra-Light Polymer Electrolyte Membrane Fuel Cells

Jang

Cho

2022

Sustainability

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In this study, 3D-printed polymer bipolar plates were fabricated and applied to the polymer electrolyte membrane fuel cells (PEMFCs). In order to overcome the poor electronic conductivity of polymer bipolar plates, silver current collecting layers were deposited using a sputter process. Influences of the thickness of the current collecting layer were carefully investigated to optimize the thickness. Using a sputter process, current collecting layers were successfully deposited without clear evidence of defects. Additionally, the increment in the total weight of bipolar plates was minimized. The average thickness of the silver current collecting layer was varied from 216 nm to 1.46 um. The results showed the fuel cell with 1.46 um thick Ag current collecting layer coated 3D printed bipolar plates achieved 0.96 V of the open circuit voltage and 308.35 mW/cm2 of performance at 25 °C.

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Section: Resultsmentioning

confidence: 98%

Effects of Ag Current Collecting Layer Fabricated by Sputter for 3D-Printed Polymer Bipolar Plate of Ultra-Light Polymer Electrolyte Membrane Fuel Cells

Jang

Cho

2022

Sustainability

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“…We believe that this sudden fluctuation in the performance of the fuel cell was caused by the liquid water in the parallel flow field. The accumulated liquidwater -related performance fluctuation in PEMFCs has been reported in prior research [39][40][41][42][43]. As previously mentioned, the parallel flow field has an inherent weak point in the removal of liquid water [1].…”

Section: Resultsmentioning

confidence: 99%

Influences of Flow Channel on Electrochemical Characteristics of Polymer Electrolyte Fuel Cells Humidified with NaCl Contained H2O

Yoo

Cho

2023

Sustainability

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In this study, the effects of flow field types on the electrochemical properties of polymer electrolyte membrane fuel cells (PEMFCs) humidified with NaCl solution are systematically investigated. The parallel flow field and serpentine flow field were used to investigate the PEMFCs. Long-term stability was evaluated for 20 h using chronoamperometry. Fuel cells with both parallel and serpentine flow fields showed a decrease in performance because of the NaCl solution. Interestingly, the PEMFC with the serpentine flow field showed significantly more severe degradation during long-term stability evaluation compared to the fuel cell with the parallel flow field. Electrochemical impedance spectroscopy analysis showed that a significant increase in faradaic resistance caused the degradation of the performance. After long-term stability examinations, regenerations of fuel cells were performed with deionized water at a constant voltage (0.4 V). After the regeneration, the performance of the fuel cells with the serpentine flow field was improved more (52.96%) than the PEMFC with the parallel flow field (1.22%).

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“…High-frequency impedance, indicative of proton transfer and ohmic loss, is an effective indicator of membrane water content, and thus can be utilized in the management of shutdown purging and diagnosing membrane drying [6]. Additionally, mid-frequency capacitance loops caused by charge transfer and low-frequency capacitance loops determined by humidity-dependent ionomer properties are important for water management to prevent flooding faults [7]. Specific low-frequency information indicating oxygen transfer and storage in the catalyst layer can further assist with air starvation diagnosis [8].…”

Section: Introductionmentioning

confidence: 99%

Impedance Acquisition of Proton Exchange Membrane Fuel Cell Using Deeper Learning Network

Xie

Yuan

et al. 2023

Energies

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Electrochemical impedance is a powerful technique for elucidating the multi-scale polarization process of the proton exchange membrane (PEM) fuel cell from a frequency domain perspective. It is advantageous to acquire frequency impedance depicting dynamic losses from signals measured by the vehicular sensor without resorting to costly impedance measurement devices. Based on this, the impedance data can be leveraged to assess the fuel cell’s internal state and optimize system control. In this paper, a residual network (ResNet) with strong feature extraction capabilities is applied, for the first time, to estimate characteristic frequency impedance based on eight measurable signals of the vehicle fuel cell system. Specifically, the 2500 Hz high-frequency impedance (HFR) representing proton transfer loss and 10 Hz low-frequency impedance (LFR) representing charge transfer loss are selected. Based on the established dataset, the mean absolute percentage errors (MAPEs) of HFR and LFR of ResNet are 0.802% and 1.386%, respectively, representing a superior performance to other commonly used regression and deep learning models. Furthermore, the proposed framework is validated under different noise levels, and the findings demonstrate that ResNet can attain HFR and LFR estimation with MAPEs of 0.911% and 1.610%, respectively, even in 40 dB of noise interference. Finally, the impact of varying operating conditions on impedance estimation is examined.

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Observation of flooding-induced performance enhancement in PEMFCs

Cited by 22 publications

References 29 publications

Effects of Ag Current Collecting Layer Fabricated by Sputter for 3D-Printed Polymer Bipolar Plate of Ultra-Light Polymer Electrolyte Membrane Fuel Cells

Effects of Ag Current Collecting Layer Fabricated by Sputter for 3D-Printed Polymer Bipolar Plate of Ultra-Light Polymer Electrolyte Membrane Fuel Cells

Influences of Flow Channel on Electrochemical Characteristics of Polymer Electrolyte Fuel Cells Humidified with NaCl Contained H2O

Impedance Acquisition of Proton Exchange Membrane Fuel Cell Using Deeper Learning Network

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