Improvement of the mechanical durability of micro porous layer in a proton exchange membrane fuel cell by elimination of surface cracks

Chun, Jeong Hwan; Jo, Dong Hyun; Kim, Pil Joo; Park, Sun Hee; Lee, Chang Hoon; Kim, Sung Hyun

doi:10.1016/j.renene.2012.04.011

Cited by 86 publications

(37 citation statements)

References 23 publications

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“…The mechanical AST was based on a literature study [25], but a simpler system was set up and already adopted in Reference [5]. A dummy cell was assembled with two GDMs at anodic and cathodic side, separated by a Nafion 212 pure membrane, namely without any catalyst to avoid any possible chemical or electrochemical stress.…”

Section: Accelerated Stress Testsmentioning

confidence: 99%

Performance Evaluation and Durability Enhancement of FEP-Based Gas Diffusion Media for PEM Fuel Cells

et al. 2017

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Nowadays, micro-porous layers (MPLs) for polymer electrolyte membrane fuel cells (PEMFCs) are commonly deposited onto gas diffusion layer (GDL) substrates starting from hydrophobic carbon-based dispersions. In this work, different quantities of fluorinated ethylene propylene (FEP), a fluorinated copolymer proven to be superior to polytetrafluoroethylene (PTFE) for a proper water management, were used to make both GDL and MPL hydrophobic. After the identification of the optimal amount of FEP, carboxymethylcellulose (CMC) was also added to gas diffusion media (GDM) to reduce overall ohmic resistance of the whole device and adhesion of MPLs to GDLs. Ex-situ chemical and mechanical accelerated stress tests (ASTs) were carried out to accelerate degradation of materials aiming to assess their durability. The highest quantity of FEP in GDMs led to the best electrochemical and diffusive properties. The presence of CMC allowed reducing overall ohmic resistance due to a better electrolyte hydration. A satisfactory durability was proven since the fundamental properties related to gas diffusion medium, such as wettability, ohmic and mass transport resistances, revealed to be quasi-stable upon ASTs.

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Section: Accelerated Stress Testsmentioning

confidence: 99%

Performance Evaluation and Durability Enhancement of FEP-Based Gas Diffusion Media for PEM Fuel Cells

et al. 2017

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“…To mimic the erosion of GDL over its lifetime solely by gas flow effect, excessive air flow experiments were conducted by Ha [22] and Chun et al [85]. To eliminate the degradation effect of electrochemical reactions, the catalyst layer was removed from the cell.…”

Section: Erosion Of Gdl By Continuous Gas Flowmentioning

confidence: 99%

“…The 2400 h test found that the carbon paper-type GDL showed larger weight loss than the carbon felt-type GDL (paper-type: À1.1%; felt-type: À0.7%), while showing similar static contact angle loss of substrate from approximately 147°to approximately 135°. Chun et al [85] accelerated the mechanical degradation by supplying a high flow rate of air (10 LPM) into the dummy cell of 25 cm 2 . Through 14 days of both dry and humidified gas experiments, they concluded that the damage on the surface of the MPL is mainly due to the water in the humidified air.…”

Section: Erosion Of Gdl By Continuous Gas Flowmentioning

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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“…Thereby, degradation of MPLs with unintended crack formation might cause deterioration of cell performance. Less observation in relation with crack formation under MPL preparation process can be found in the literature (Chun, et al, 2012. Typically, MPLs were fabricated by mixing carbon powder, PTFE dispersion, isopropyl alcohol and distilled water and then applying to a GDL.…”

Section: Manufacturing Processmentioning

confidence: 99%

An overview of cracks and interfacial voids in membrane electrode assemblies in polymer electrolyte fuel cells

Tsushima

Hirai

2015

JTST

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In this review, an overview of cracks and interfacial voids formed in membrane electrode assemblies in polymer electrolyte fuel cells is presented. State-of-the-art of findings on formation processes of the cracks and the voids are described together with recent advances on development of characterization and diagnostic tools. The drawbacks and potentials of the cracks and the interfacial voids in the MEAs are also discussed. The cracks and the voids possibly deteriorate cell performance due to less electrical contact in the MEAs. On the other hand, the cracks can enhance the liquid and the gas transport in the MEAs that is better for PEFCs. Finally, future perspectives and remaining challenges concerned with the cracks and the interfacial voids are addressed.

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Improvement of the mechanical durability of micro porous layer in a proton exchange membrane fuel cell by elimination of surface cracks

Cited by 86 publications

References 23 publications

Performance Evaluation and Durability Enhancement of FEP-Based Gas Diffusion Media for PEM Fuel Cells

Performance Evaluation and Durability Enhancement of FEP-Based Gas Diffusion Media for PEM Fuel Cells

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

An overview of cracks and interfacial voids in membrane electrode assemblies in polymer electrolyte fuel cells

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