Controlling gas diffusion layer oxidation by homogeneous hydrophobic coating for polymer electrolyte fuel cells

Hiramitsu, Yusuke; Sato, Hitoshi; Kobayashi, Kenji; Hori, Michio

doi:10.1016/j.jpowsour.2011.01.099

Cited by 21 publications

(17 citation statements)

References 23 publications

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“…18 Despite the tremendous studies on the GDL, the impacts of the hydrophobicity loss of GDL on the transports of reactant gases and liquid water through the GDL and the causes for the hydrophobicity loss of GDL in a PEMFC are not yet well understood. 19 We have investigated the hydrophobicity loss of GDL under acid solution in a previous paper. 20 The present work is to investigate how the hydrophobicity of GDL degrades under electrochemical oxidation and the effects of its degradation on H 2 /air fuel cell performance.…”

Section: Introductionmentioning

confidence: 99%

Study on hydrophobicity loss of the gas diffusion layer in PEMFCs by electrochemical oxidation

Sheng

Liu

et al. 2014

RSC Adv.

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aThe hydrophobicity loss of the gas diffusion layer (GDL) in proton exchange membrane fuel cells (PEMFCs) was investigated by an accelerated stress test of electrochemical oxidation at a constant potential. The fresh and oxidized GDLs were characterized by cyclic voltammetry, contact angle measurements and water permeability. Results showed the occurrence of the oxidation of carbon and the decrease of the hydrophobicity of GDL. To discuss the reasons for the hydrophobicity loss, scanning electron microscopy, X-ray photoelectron spectroscopy and thermogravimetry were analyzed. It was found that the hydrophobicity loss was closely associated with the losses of the carbon materials and polytetrafluoroethylene (PTFE) in GDL under test conditions. In addition, the mass loss of carbon materials was more than that of PTFE.

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Section: Introductionmentioning

confidence: 99%

Study on hydrophobicity loss of the gas diffusion layer in PEMFCs by electrochemical oxidation

Sheng

Liu

et al. 2014

RSC Adv.

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“…The GDL becomes hydrated by the water produced during the electrochemical reaction or supplied with hydrogen or oxygen gas. The accumulated water on the GDL can dissolve the GDL carbon material and generate hydroxide, oxides, and other species [74,75].…”

Section: Dissolution Effect On Gdlmentioning

confidence: 99%

A review of the gas diffusion layer in proton exchange membrane fuel cells: Durability and degradation

et al. 2015

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“…Others [58], [59] have pointed to the effect of carbon film coating on improving the mechanical and electrical properties of gas diffusion layers. In [60] the role of homogeneous coating in controlling the diffusion overvoltage from the gas diffusion layers was revealed. Several other studies [61][62][63][64][65][66] stressed the importance of coating for bipolar plates to prevent surface corrosion.…”

Section: Technology Development Organisation (Nedo) and The Europeanmentioning

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

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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.

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Controlling gas diffusion layer oxidation by homogeneous hydrophobic coating for polymer electrolyte fuel cells

Cited by 21 publications

References 23 publications

Study on hydrophobicity loss of the gas diffusion layer in PEMFCs by electrochemical oxidation

Study on hydrophobicity loss of the gas diffusion layer in PEMFCs by electrochemical oxidation

A review of the gas diffusion layer in proton exchange membrane fuel cells: Durability and degradation

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

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