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Development of 70 MPa Differential-pressure Water Electrolysis Stack

Article of Honda R&D Technical Review Vol.28 No.1

Summary

In order to accommodate the increased fuel tank storage pressure of fuel cell vehicles to 70 MPa, measures were taken to enable hydrogen stations that use Honda’s proprietary differential-pressure water electrolysis technology to support higher pressures. Specifications capable of enduring long-time operation at 70 MPa were established by using a sealing structure with a high-pressure hydrogen channel in the center of the cell. In addition, the break mechanism of the proton exchange membrane was clarified, and specifications capable of sustaining the differential pressure were set. A high-pressure water electrolysis stack based on this know-how was manufactured and compared with existing hydrogen stations that use a mechanical compressor, and it was confirmed that the electric power needed to produce hydrogen compressed to 70 MPa was reduced by approximately 30%. Moreover, the water content of the hydrogen was reduced by 60% compared to that of hydrogen compressed to 35 MPa, which reduced the dehumidification energy needed for use as hydrogen fuel for fuel cell vehicles.

Reference

(1) Nakazawa, K., Nagaoka, H., Takeuchi, J., Moburg, F., Yamashita, I., Okabe, M.: Introduction of High Differential Pressure Water Electrolysis-type Solar Hydrogen Station (SHS2), Honda R&D Technical Review, Vol. 22, No. 2, p. 28-35
(2) 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
(3) Takeuchi, J., Nakazawa, K., Yoshida, N., Ito, J., Okabe, M., Yamashita, I.: Introduction of Solar Hydrogen Station Installed in Japan, Honda R&D Technical Review, Vol. 25, No. 1, p. 86-92
(4) Yoshida, N., Miyake, A.: Verification Test Results for Solar Hydrogen Station in Japan, Honda R&D Technical Review, Vol. 26, No. 2, p. 200-206
(5) http://www.honda.co.jp/news/2014/4140918.html
(6) http://www.honda.co.jp/news/2014/4141215.html
(7) 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
(8) Kawasaki, N., Haryu, E., Ishikawa, H., Nakazawa, K., Okabe, M.: Study of Seal Structure of High-differential-pressure Water Electrolysis Cell, Honda R&D Technical Review, Vol. 25, No. 2, p. 137-144
(9) Grigoriev, S. A., Porembskiy, V. I., Korobtsev, S. V., Fateev, V. N., Auprêtre, F., Millet, P.: High-pressure PEM water electrolysis and corresponding safety issues, International Journal of Hydrogen Energy, Vol. 36, No. 3, p. 2721-2728, (2011)
(10) JIS B2401-2: 2012, O-Rings-Part 2: Housing dimensions and sizes
(11) SAE J2719: 2011, Hydrogen Fuel Quality for Fuel Cell Vehicles
(12) ISO/TS 14687-2: 2008, Hydrogen fuel - Product Specification - Part 2: Proton exchange membrane (PEM) fuel cell applications for road vehicles
(13) The Electrochemical Society of Japan: Electrochemical handbook, Vol. 5, p. 155, (2000)
(14) Japan Automotive Research Institute: Analysis of Total Efficiency and Greenhouse Gas Emission, p. 58, (2011)

Author (organization or company)

Hiroyuki ISHIKAWA(Automobile R&D Center)、Eiji HARYU(Automobile R&D Center)、Nobuyuki KAWASAKI(Automobile R&D Center)、Hayato DAIMON(Automobile R&D Center)

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