Fabrication of GDL microporous layer using PVDF for PEMFCs

Park, Sung Bum; Kim, Sungjin; Park, Yong-il; Oh, Myung‐Hwan

doi:10.1088/1742-6596/165/1/012046

Cited by 27 publications

(23 citation statements)

References 2 publications

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“…As seen in Figure 4(e), the surface of the electrode does not have any crevices; since the presence of PVDF prevents the cracking of the surface. Park et al have reported similar results for PVDF using GDL preparation 33. Figure 4(f) shows the uniform porous structure of the electrode.…”

Section: Resultssupporting

confidence: 63%

Phosphoric acid doped polybenzimidazole membrane for high temperature PEM fuel cell

Ergün¹,

Devrim²,

Baç³

et al. 2012

J of Applied Polymer Sci

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In the present study, phosphoric acid doped polybenzimidazole (PBI) membranes with potential applications in high temperature PEM fuel cells were investigated. PBI was synthesized by polycondensation of 3,3 0 -diaminobenzidine and isophtalic acid in polyphosphoric acid. The formation of PBI was validated by H 1 -NMR and elemental analysis. PBI membranes were prepared by solution casting method and immersed in phosphoric acid in order to provide ionic conductivity. The phosphoric acid doped membranes were used to prepare membrane electrode assemblies (MEA) for PEMFC operation. Gas diffusion layer (GDL) spraying method was used to prepare the electrodes. In order to determine optimum electrode structure, the effect of electrode preparation technique on fuel cell performances was studied. Two methods were applied in which the binder differs in the catalyst ink. In the first method, 5 wt % PBI solution was used as the binder. In the second method, polyvinylidene fluoride (PVDF) was used in addition to PBI as the binder in the catalyst ink. The MEA were tested in a single cell operating at 100 C without need for humidification of reactant gases. The observed maximum power output was increased considerably from 0.015 to 0.072 W/cm 2 at 150 C when the binder of the catalyst was changed from PBI to PBI and PVDF mixture (PVDF : PBI ¼ 3 : 1). A single cell was operated up to 160 C and the power outputs of 0.032 and 0.063 W/cm 2 were obtained at operating temperatures of 125 and 160 C, respectively.

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Section: Resultssupporting

confidence: 63%

Phosphoric acid doped polybenzimidazole membrane for high temperature PEM fuel cell

Ergün¹,

Devrim²,

Baç³

et al. 2012

J of Applied Polymer Sci

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“…The GDL is a porous layer sandwiched between the catalyst layer (CL) and the flow-field plate. The main functions of the GDL are to uniformly and efficiently distribute the reactant gases to the catalyst layer; improve the electrical contact with the latter; dissipate heat that is mainly generated in the cathode catalyst layer; and drive excessive liquid water away from the electrodes to the flow channels [11][12][13][14][15][16][17][18]. To efficiently perform the above functions, the GDL is usually wet-proofed [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Through-plane gas permeability of gas diffusion layers and microporous layer: Effects of carbon loading and sintering

Orogbemi

Ingham

Ismail

et al. 2018

Journal of the Energy Institute

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Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/) eprints@whiterose. AbstractKnowledge of the absolute permeability for the various porous layers is necessary to obtain accurate profiles for water saturation within the membrane electrode assembly (MEA) in a twophase model of a polymer electrolyte membrane fuel cell (PEMFC). In this paper, the gas permeability of gas diffusion layers (GDLS) coated with micro-porous layers (MPLs) of various carbon loadings for two different carbon blacks have been experimentally measured.The permeability of the GDL was found to decrease by at least one order of magnitude after the MPL-coating. Also, the permeability of the MPLs was shown to be lower than that of the carbon substrate by 2-3 orders of magnitude. Further, it was found that the gas permeability of the MPLs changes significantly from one carbon loading to another despite the use of a single weight composition for all the MPLs coated, namely 20% PTFE and 80% carbon black. This signifies the possible inaccuracy in estimating the MPL permeability through employing the cross-section SEM images as they do not resolve the MPL penetration into the carbon substrate.Finally, the MPL sintering was found to slightly decrease the permeability of the GDL.

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“…1 shows a scanning electron microscopy (SEM) image of commercially available SGL-10BB. The fabrication of the MPL generally involves spraying a mixture of carbon black particles (typically Vulcan XC72) with PTFE suspended in a fluid matrix onto one of the surfaces of the GDL (though other fabrication techniques exist) [16,17]. The MPL coating can be either fully-immersed, where the MPL exists within the pore-space of the GDL, partiallyimmersed, where part of the MPL is within the GDL pore-space and the other part is its own layer, or as a standalone structure [4].…”

Section: The Microporous Layermentioning

confidence: 99%

Impact of polymer electrolyte membrane fuel cell microporous layer nano-scale features on thermal conductance

Botelho

Bazylak

2015

Journal of Power Sources

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Fabrication of GDL microporous layer using PVDF for PEMFCs

Cited by 27 publications

References 2 publications

Phosphoric acid doped polybenzimidazole membrane for high temperature PEM fuel cell

Phosphoric acid doped polybenzimidazole membrane for high temperature PEM fuel cell

Through-plane gas permeability of gas diffusion layers and microporous layer: Effects of carbon loading and sintering

Impact of polymer electrolyte membrane fuel cell microporous layer nano-scale features on thermal conductance

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