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Study of Seal Structure of High-differential-pressure Water Electrolysis Cell

Article of Honda R&D Technical Review Vol.25 No.2

Summary

A study was conducted of a method of realizing airtightness for high-pressure hydrogen in an electrolysis cell using high differential pressure water electrolysis, a high-pressure (35 MPa) hydrogen production technology. When conducting high differential pressure water electrolysis in an electrolysis cell using a proton exchange membrane, the maintenance of airtightness against high-pressure hydrogen via the membrane, an elastic part, represents an issue. To resolve this issue, the effect of the use conditions of the membrane on changes in the thickness of the membrane was studied. The results indicated that it was necessary to set the holding loads in the cells so as to help ensure that the surface pressure of the membranes maintaining airtightness around the cathode space was greater than the pressure of the high-pressure hydrogen, and to select the hardness of the seal parts with consideration of the gaps occurring due to the state of wetness or dryness of the membrane. Evaluation of the durability of a high differential pressure water electrolysis stack applying the findings of this study verified that airtightness was maintained over the long term.

Reference

(1) Ueyama, M., Kita, M., Taguchi, S., Nakazawa, K., Nagaoka, H., Arakawa, S.: Introduction of Hydrogen Refueling Station with Photovoltaic Modules, Honda R&D Technical Review, Vol. 15, No. 2, p. 31-38
(2) Okabe, M., Nakazawa, K., Taruya, K., Handa K.: Verification Test of Solar-powered Hydrogen Station (SHS) with Photovoltaic Modules, Honda R&D Technical Review, Vol. 20, No. 1, p. 72-79
(3) Nakazawa, K., Nagaoka H., Takeuchi, J., Moburg, F., Yamashita, I., Okabe, M.: Introduction of High Differential Pressure Water Electrolysis-type Solar Hydrogen, Honda R&D Technical Review, Vol. 22, No. 2, p. 28-35
(4) Nagaoka, H., Yoshida, N., Cun, D., Yamashita, I., Okabe. M.: Verification Test of High Differential Pressure Water Electrolysis-type Solar Hydrogen Station (SHS2), Honda R&D Technical Review, Vol. 24, No. 2, p. 74-81
(5) Haryu, E., Nakazawa, K., Taruya, K., Ishikawa, H., Okabe, M.: Mechanical Structure and Performance Evaluation of High Differential Pressure Water Electrolysis Cell, Honda R&D Technical Review, Vol. 23, No. 2, p. 97-105
(6) JIS B2401: O-rings (2005)
(7) The Electrochemical Society of Japan: Electrochemical handbook, Vol. 5, p. 155 (2000)
(8) Japan Fluid Power Association (JFPA) standard: Guidelines for specification and selection of seals for hydraulic cylinders, JFPS 1003 (1999)

Author (organization or company)

Nobuyuki KAWASAKI(Automobile R&D Center)、Eiji HARYU(Automobile R&D Center)、Hiroyuki ISHIKAWA(Automobile R&D Center)、Koji NAKAZAWA(Automobile R&D Center)、Masanori OKABE(Automobile R&D Center)

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