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Hongnyoung Yoo,Jaeyeon Kim,Obeen Kwon,Hyeok Kim,Geon Hwi Kim,Heesoo Choi,Hyeonjin Cha,Dasol Kim,Segeun Jang,Taehyun Park 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.8 No.3
This article reports on a flexible polymer electrolyte membrane fuel cell (PEMFC) with a pre-bent flow field. The performances in the flat and bent positions were lower and higher, respectively than that of the traditional flexible fuel cells. The low performance in the flat position was attributed to the void space induced incomplete contact at the interface of the membrane electrode assembly (MEA) and flow-field plates, which resulted in poor performance due to the high ohmic resistance (5.85 Ω cm2) and faradaic resistance (4.17 Ω cm2). However, when bending stress was applied to the MEA, a decreased ohmic resistance (0.954 Ω cm2), faradaic resistance (0.737 Ω cm2), and an enhanced power density (88.7 mW/cm2) were observed because of the improved interfacial contact property between the MEA and the flow-field plates from the increased compressive stress. These experimental results were further analyzed and visualized with aid of the finite element analysis. Despite the relatively low performance in the flat shape, the proposed pre-bent design of the flexible PEMFC possesses promising applicability especially in flexible electronics where the curved shapes are highly required.
Investigation of Gas Diffusion Layers for Flexible Polymer Electrolyte Membrane Fuel Cells
Yoonho So,Hongnyoung Yoo,Jaeyeon Kim,Obeen Kwon,Seokhun Jeong,Heesoo Choi,Hyeonjin Cha,Taehyun Park 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.4
In this study, we report the investigation of the gas diffusion layers (GDLs) in flexible polymer electrolyte membrane fuel cells (PEMFCs) and measure the cell assembly pressure via force sensitive resistor (FSR). We confirmed the performance of the flexible PEMFCs using carbon cloth (pristine CC), carbon paper (CP), and carbon cloth with MPL (MPL CC) as GDLs. The performance of flexible PEMFCs in the flat position with pristine CC, CP, and MPL CC are 54.2, 24.2, and 22.8 mW/cm2, respectively. On the other hand, that of flexible PEMFCs in the bent position is 94.5, 52.9, and 46.0 mW/cm2, respectively. The cell assembly pressure depending on GDLs, is confirmed via FSR measurements. The cell assembly pressure based on curvatures is higher in the order of CP, MPL CC, and pristine CC. We investigated the application of GDLs because optimization is complicated based on the bending characteristics in flexible PEMFCs. This study can be helpful for the selection of GDLs in flexible PEMFCs.