Chemical degradation of Nafion ionomer at a catalyst interface of polymer electrolyte fuel cell by hydrogen and oxygen feeding in the anode

Kurniawan, Dodik; Arai, Hiromichi; Morita, Shigeaki; Kitagawa, Kuniyuki

doi:10.1016/j.microc.2012.10.004

Cited by 17 publications

(8 citation statements)

References 21 publications

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“…[27][28][29][30][31] Nafion is known as a relatively stable polymer but in the fuel cell particularly during power generation it was found to be decomposed by the generated hydrogen peroxide. [31][32][33][34][35] It should be noted that X-ray and g-ray induced radiation damage of Nafion has been also reported. [36][37][38][39][40][41] In order to follow the response by external stimuli as well as the degradation, in situ observations of model cells similar to practical equipment [5][6][7][15][16][17][18][19]21,22,28,[33][34][35] are essentially important.…”

Section: Introductionmentioning

confidence: 98%

“…[31][32][33][34][35] It should be noted that X-ray and g-ray induced radiation damage of Nafion has been also reported. [36][37][38][39][40][41] In order to follow the response by external stimuli as well as the degradation, in situ observations of model cells similar to practical equipment [5][6][7][15][16][17][18][19]21,22,28,[33][34][35] are essentially important.…”

Section: Introductionmentioning

confidence: 98%

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In situ S-K XANES study of polymer electrolyte fuel cells: changes in the chemical states of sulfonic groups depending on humidity

Isegawa

Nagami

Jomori

et al. 2016

Phys. Chem. Chem. Phys.

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Changes in the chemical states of sulfonic groups of Nafion in polymer electrolyte fuel cells (PEFCs) under gas-flowing conditions were studied using in situ S-K XANES spectroscopy. The applied potential to the electrodes and the humidity of the cell were changed under flowing H gas in the anode and He gas in the cathode. While the potential shows no significant effect on the S-K XANES spectra, the humidity is found to induce reversible changes in the spectra. Comparison of the spectral changes with simulations based on the density functional theory calculations indicates that the humidity influences the chemical state of the sulfonic group; under wet conditions the sulfonic group is in the form of a sulfonate ion. By drying treatment the sulfonate ion binds to hydrogen and becomes sulfonic acid. Furthermore, a small fraction of the sulfonic acid irreversibly decomposes to atomic sulfur. The peak energy of the atomic sulfur suggests that the generated atomic sulfur is adsorbed on the Pt catalyst surfaces.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

In situ S-K XANES study of polymer electrolyte fuel cells: changes in the chemical states of sulfonic groups depending on humidity

Isegawa

Nagami

Jomori

et al. 2016

Phys. Chem. Chem. Phys.

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“…In particular, its application in fuel cells has attracted considerable interest because this technology has recently been used to supply energy to automobiles, for stationary power generation and for portable electronic devices [ 3 , 4 ]. Nafion, a polyperfluorosulfonic acid (PFSA) membrane developed by DuPont, is an important PEM because of its high proton conductivity, good chemical stability and high mechanical strength [ 5 – 7 ]. It consists of a carbon-fluorine backbone with perfluoro side chains containing sulfonic acid groups.…”

Section: Introductionmentioning

confidence: 99%

Hepatic Transcriptome Responses in Mice (Mus musculus) Exposed to the Nafion Membrane and Its Combustion Products

Feng

Habteselassie

et al. 2015

PLoS ONE

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Nafion 117 membrane (N117), an important polymer electrolyte membrane (PEM), has been widely used for numerous chemical technologies. Despite its increasing production and use, the toxicity data for N117 and its combustion products remain lacking. Toxicity studies are necessary to avoid problems related to waste disposal in landfills and incineration that may arise. In this study, we investigated the histopathological alterations, oxidative stress biomarker responses, and transcriptome profiles in the liver of male mice exposed to N117 and its combustion products for 24 days. An ion-chromatography system and liquid chromatography system coupled to a hybrid quadrupole time-of-flight mass spectrometry were used to analyze the chemical compositions of these combustion products. The transcriptomics analysis identified several significantly altered molecular pathways, including the metabolism of xenobiotics, carbohydrates and lipids; signal transduction; cellular processes; immune system; and signaling molecules and interaction. These studies provide preliminary data for the potential toxicity of N117 and its combustion products on living organisms and may fill the information gaps in the toxicity databases for the currently used PEMs.

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“…The disturbance of the balance of an electrochemical system is achieved by varying electrode potential, the passage of electric current or by any excitation method such as changes in pressure, temperature, variation of electro-active species, etc. In general, a variation of the potential or the application of a current is used and the system responds to these disturbances with behavioral changes that may be followed by changes in the circulating current, electrode potential or the associated load [1,2].…”

Section: Introductionmentioning

confidence: 99%

The impact of using a proton exchange membrane on alkaline fuel cell performance

Reyes-Pineda

Londoño-Ramírez

Cardona-Hernández

2015

Rev. Fac. Ing. Antioquia

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Chemical degradation of Nafion ionomer at a catalyst interface of polymer electrolyte fuel cell by hydrogen and oxygen feeding in the anode

Cited by 17 publications

References 21 publications

In situ S-K XANES study of polymer electrolyte fuel cells: changes in the chemical states of sulfonic groups depending on humidity

In situ S-K XANES study of polymer electrolyte fuel cells: changes in the chemical states of sulfonic groups depending on humidity

Hepatic Transcriptome Responses in Mice (Mus musculus) Exposed to the Nafion Membrane and Its Combustion Products

The impact of using a proton exchange membrane on alkaline fuel cell performance

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