Effects of pressure on stability of nafion membrane under water electrolysis

Hiroyuki Michishita, Kei Ichi Akabori, Keiji Tanaka, Hiroshi Matsumoto, Daizou Haruta, Yoshinori Nagata, Nagaaki Yamamoto, Tatsumi Ishihara

Research output: Contribution to journalArticle

Abstract

In previous study, proton conductivity increased with increasing pressure under water electrolysis, so the effects of pressure on the stability of Nafion 117 have been studied. It was found that conductivity of Nafion 117 drastically decreased at initial few h and then gradually decreased in the following period under electrolysis condition. Decrease in conductivity can be explained by decomposition of Nafion 117. Decomposition of Nafion 117 is accelerated by increasing pressure. Solid state NMR, IR, and Raman spectroscopy suggested that the electrochemical oxidation of sulfo group was occurred at initial period followed by decomposition of CFn main or side chain. Therefore, initial increase in resistance can be explained by desorption of sulfo group in Nafion 117. Desorption of sulfo group also forms pin hole in Nafion membrane which may cause gas leakage under water electrolysis. Mechanical strength of Nafion membrane is also drastically decreased at initial electrolysis period. Consequently, chemical stability of Nafion 117 may cause serious problem for water electrolysis application and this study reveals that increasing pressure strongly accelerates the decomposition of Nafion 117.

Original languageEnglish
Pages (from-to)42-49
Number of pages8
JournalElectrochemistry
Volume78
Issue number1
DOIs
Publication statusPublished - Jan 1 2010

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Electrolysis
Membranes
Water
Decomposition
Desorption
Proton conductivity
Electrochemical oxidation
Leakage (fluid)
Chemical stability
Nuclear magnetic resonance spectroscopy
Strength of materials
Raman spectroscopy
Infrared spectroscopy
perfluorosulfonic acid
Gases

All Science Journal Classification (ASJC) codes

  • Electrochemistry

Cite this

Effects of pressure on stability of nafion membrane under water electrolysis. / Michishita, Hiroyuki; Akabori, Kei Ichi; Tanaka, Keiji; Matsumoto, Hiroshi; Haruta, Daizou; Nagata, Yoshinori; Yamamoto, Nagaaki; Ishihara, Tatsumi.

In: Electrochemistry, Vol. 78, No. 1, 01.01.2010, p. 42-49.

Research output: Contribution to journalArticle

Michishita, H, Akabori, KI, Tanaka, K, Matsumoto, H, Haruta, D, Nagata, Y, Yamamoto, N & Ishihara, T 2010, 'Effects of pressure on stability of nafion membrane under water electrolysis', Electrochemistry, vol. 78, no. 1, pp. 42-49. https://doi.org/10.5796/electrochemistry.78.42
Michishita, Hiroyuki ; Akabori, Kei Ichi ; Tanaka, Keiji ; Matsumoto, Hiroshi ; Haruta, Daizou ; Nagata, Yoshinori ; Yamamoto, Nagaaki ; Ishihara, Tatsumi. / Effects of pressure on stability of nafion membrane under water electrolysis. In: Electrochemistry. 2010 ; Vol. 78, No. 1. pp. 42-49.
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AU - Nagata, Yoshinori

AU - Yamamoto, Nagaaki

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