Influence of cathode gas diffusion media on the performance of the PEMFCs

Mani, Prasanna; Ha, Hy.; Cho, EunAe; Hong, Seong Ahn; Oh, Ingyu

doi:10.1016/j.jpowsour.2004.01.030

Cited by 145 publications

(105 citation statements)

References 8 publications

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“…2 Lim et al 1 reported that the coating preferentially accumulates at multiple intersecting graphite fibers during the application process, which may lead to a blockage of the pores under certain conditions. This finding is supported by the coating distributions published by Prasanna et al, 3 who reported that high coating loads (up to 40 wt%) lead to almost complete clogging of the GDL. A more detailed characterization of the change in the pore size distribution has been performed by Park and Popov 4 with mercury intrusion measurements.…”

supporting

confidence: 75%

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Impact of Hydrophobic Coating on Mass Transport Losses in PEFCs

Biesdorf

Forner‐Cuenca

Schmidt

et al. 2015

J. Electrochem. Soc.

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Experimental results about the impact of hydrophobic coating inside commercial gas diffusion layers (GDL) of polymer electrolyte fuel cells (PEFC) were obtained with four different combinations of PTFE-loadings on both anode and cathode. The measurements were performed on differential PEFCs which were characterized with high resolution neutron radiography (NR) combined with two electrochemical methods: a pulsed gas analysis (PGA) and limiting current density measurements. Using the combination of the neutron radiographs with these two electrochemical measurements, a new insight on the impact of water on mass transport losses was obtained. Under high humidification conditions, GDLs without hydrophobic coating do not accumulate more water than coated GDLs, but the water distributes differently and accumulates in the region under the channel of the flow field. Cells with high PTFE coating show higher mass transport losses despite the relatively small quantity of water, which can be explained by a different morphology of water accumulation. Polymer electrolyte fuel cells (PEFCs) are electrochemical energy converters to provide electric power for stationary, automotive and portable applications. In particular, highest power densities are required for mobile and automotive applications implying cell operation at high current densities (≥1 Acm −2 ). At these operational conditions, mass transport losses (MTL) become dominant and lead to a significant drop in performance. MTL essentially originate from an excessive water accumulation inside the gas diffusion layer (GDL), as the removal of water and the supply of reactant gases share the same pathways.Inside a GDL, liquid water propagates under the effect of capillary forces from the catalyst layer (CL) to the flow channel.

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supporting

confidence: 75%

“…Lim et al 1 explained the poor performance at high coating loads by the fact that their coating process results in a thin film on the surface of the GDL which leads to a substantial diffusion resistance of the reactant gases. Prasanna et al 3 reported about a better water removal at low coating loads of 10 wt% PTFE.…”

mentioning

confidence: 99%

Impact of Hydrophobic Coating on Mass Transport Losses in PEFCs

Biesdorf

Forner‐Cuenca

Schmidt

et al. 2015

J. Electrochem. Soc.

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“…As expected, gas (or water vapour) permeability reduces with the Teflon content due to the blockage of part of the macroporosity by the Teflon (Prasanna et al, 2004a;Prasanna et al, 2004b;Soler et al, 2003;Williams et al, 2004). It is especially significant the value of the water vapour permeability, since in this type of fuel cell, water product will be in this state.…”

Section: Physical Characterisationmentioning

confidence: 59%

“…Secondly, cell performance clearly worsens with an increase of the Teflon content. Unlike the carbon support, in this case the overall cell performance seems to result affected by an excess of Teflon binder, as Prasanna et al (Prasanna et al, 2004a) also observed for Nafion ® -based PEMFC. Therefore, the MPL does not only have influence in terms of mass transfer limitations, but in kinetic and ohmic ones due to an excess of insulator material.…”

Section: A) Physical Characterisationmentioning

confidence: 65%

“…This layer is made of a carbonaceous support, onto which it can be deposited another layer, the microporous layer (MPL), formed by carbon black and a certain amount of a polymer binder. In traditional low temperature, this GDL also playes the role of an effective removal of the liquid water is produced in the cathode, in order to avoid the flooding of the electrode (Benziger et al, 2005;Mathias et al, 2003;Prasanna et al, 2004a). The catalytic layer is the part of the cell where the electrochemical reactions take place.…”

mentioning

confidence: 99%

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