Influence of hydrophilicity in micro-porous layer for polymer electrolyte membrane fuel cells

Ahn, Minjeh; Cho, Yong‐Hun; Cho, Yoon-Hwan; Kim, Jin-Ho; Jung, Namgee; Sung, Yung‐Eun

doi:10.1016/j.electacta.2010.11.063

Cited by 66 publications

(41 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The diameter of the semicircle in the plot corresponded to the charge transfer resistance attributed to the kinetic rate of the oxygen reduction reaction. The arc in the low frequency corresponded to the mass transfer resistance related to the mass transport characteristics in the membrane electrode assembly [29]. From the EIS at different current density, we can see that the GDL prepared with PVP aqueous solution had a lower ohmic resistance than the GDL with ethanol, especially at the low current density, which might be the main factor resulting in the better fuel cell performance.…”

Section: Fuel Cell Performance and Eis Analysismentioning

confidence: 98%

Preparation of microporous layer for proton exchange membrane fuel cell by using polyvinylpyrrolidone aqueous solution

Sheng¹,

Li²,

Hao³

et al. 2014

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

Section: Fuel Cell Performance and Eis Analysismentioning

confidence: 98%

Preparation of microporous layer for proton exchange membrane fuel cell by using polyvinylpyrrolidone aqueous solution

Sheng¹,

Li²,

Hao³

et al. 2014

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

“…For example, Martinez-Rodriguez et al [37] found that the aperture of the cracks developed in their MPL was in the range of 4.4 microns to 32 microns. Furthermore, the density and aperture of the cracks developed in the MPL appear to increase with its hydrophobicity [38]. To elucidate the role of the cracks in water conduction, we take a MPL with moderate hydrophobicity in that its water contact angle is 110 o as an example.…”

Section: Pore-size Distribution and Water Invasionmentioning

confidence: 99%

Modelling water intrusion and oxygen diffusion in a reconstructed microporous layer of PEM fuel cells

Zhang

Gao

Ostadi

et al. 2014

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

The hydrophobic microporous layer (MPL) in PEM fuel cell improves water management but reduces oxygen transport. We investigate these conflict impacts using nanotomography and porescale modelling. The binary image of a MPL is acquired using FIB/SEM tomography. The water produced at the cathode is assumed to condense in the catalyst layer (CL), and then builds up a pressure before moving into the MPL. Water distribution in the MPL is calculated from its pore geometry, and oxygen transport through it is simulated using pore-scale models considering both bulk and Knudsen diffusions. The simulated oxygen concentration and flux at all voxels are volumetrically averaged to calculate the effective diffusion coefficients. For water flow, we found that when the MPL is too hydrophobic, water is unable to move through it and must find alternative exits. For oxygen diffusion, we found that the interaction of the bulk and Knudsen diffusions at pore scale creates an extra resistance after the volumetric average, and that the conventional dusty model substantially overestimates the effective diffusion coefficient.

show abstract

“…Coating MPL with hydrophobic substances such as fluorinated ethylene propylene (FEP) [91], polytetrafluoroethylene (PTFE) [92,93], or with copolymer containing hydrophilic functional groups [94] and composite carbon black [95], has been suggested as an effective strategy for managing water transport within the cell. The improvement in cell polarisation [91] was clearly due to the change in FEP loading (e.g.…”

Section: Water Distribution and Transportmentioning

confidence: 99%

Degradation aspects of water formation and transport in Proton Exchange Membrane Fuel Cell: A review

Ous

Arcoumanis

2013

Journal of Power Sources

134

View full text Add to dashboard Cite

This is the accepted version of the paper.This version of the publication may differ from the final published version. Permanent repository link AbstractThis review paper summarises the key aspects of Proton Exchange Membrane Fuel Cell (PEMFC) degradation that are associated with water formation, retention, accumulation, and transport mechanisms within the cell. Issues related to loss of active surface area of the catalyst, ionomer dissolution, membrane swelling, ice formation, corrosion, and contamination are also addressed and discussed. The impact of each of these water mechanisms on cell performance and durability was found to be different and to vary according to the design of the cell and its operating conditions. For example, the presence of liquid water within Membrane Electrode Assembly (MEA), as a result of water accumulation, can be detrimental if the operating temperature of the cell drops to sub-freezing.The volume expansion of liquid water due to ice formation can damage the morphology of different parts of the cell and may shorten its life-time. This can be more serious, for example, during the water transport mechanism where migration of Pt particles from the catalyst may take place after detachment from the carbon support. Furthermore, the effect of transport mechanism could be augmented if humid reactant gases containing impurities poison the membrane, leading to the same outcome as water retention or accumulation.Overall, the impact of water mechanisms can be classified as aging or catastrophic. Aging has a longterm impact over the duration of the PEMFC life-time whereas in the catastrophic mechanism the impact is immediate. The conversion of cell residual water into ice at sub-freezing temperatures by the water retention/ accumulation mechanism and the access of poisoning contaminants through the water transport mechanism are considered to fall into the catastrophic category. The effect of water mechanisms on PEMFC degradation can be reduced or even eliminated by (a) using advanced materials for improving the electrical, chemical and mechanical stability of the cell components against deterioration, and (b) implementing effective strategies for water management in the cell.

show abstract

Influence of hydrophilicity in micro-porous layer for polymer electrolyte membrane fuel cells

Cited by 66 publications

References 41 publications

Preparation of microporous layer for proton exchange membrane fuel cell by using polyvinylpyrrolidone aqueous solution

Preparation of microporous layer for proton exchange membrane fuel cell by using polyvinylpyrrolidone aqueous solution

Modelling water intrusion and oxygen diffusion in a reconstructed microporous layer of PEM fuel cells

Degradation aspects of water formation and transport in Proton Exchange Membrane Fuel Cell: A review

Contact Info

Product

Resources

About