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Abstract

The electrode-diaphragm-electrode (EDE) unit was developed for energy and cost savings in the production of hydrogen by alkaline water electrolysis. It consists of a cathode, anode and diaphragm and offers an optimal cell configuration with low ohmic losses. Preparing EDE-units involves tape casting of the diaphragm layer, sieve printing of the electrodes in oxidic form, sintering of the ceramic component and final reduction of the nickel oxide in hydrogen atmosphere. EDE units were tested in long term electrolysis for over 7000 hours at a current density of 250 mA cm2 at 90 C, in 30% KOH and ambient pressure. To avoid high contact resistances between the EDE-anode and the studded bipolar wall, the EDE-anode was stuck to the bipolar plate with a nickel oxide slurry, and the nickel oxide was reduced to nickel in hydrogen atmosphere to form a tight contact. Different polymeric materials were investigated for their suitability as frame material for the EDE-units, and only PEEK (ICI) was found to be stable in 30% KOH at 150 C, under 5 bars of O(2). Efforts were also made to activate the EDE-electrodes by Ni Co-oxides and by Raney-nickel.

Additional information

Authors: WENDT H, TECHNISCHE HOCHSCHULE DARMSTADT, INSTITUT FUER CHEMISCHE TECHNOLOGIE, DARMSTADT (DE);HOFMANN H, TECHNISCHE HOCHSCHULE DARMSTADT, INSTITUT FUER CHEMISCHE TECHNOLOGIE, DARMSTADT (DE);BLAISE M, TECHNISCHE HOCHSCHULE DARMSTADT, INSTITUT FUER CHEMISCHE TECHNOLOGIE, DARMSTADT (DE);RAUSCH S TECHNISCHE HOCHSCHULE DARMSTADT, INSTITUT FUER CHEMISCHE TECHNOLOGIE, DARMSTADT (DE), TECHNISCHE HOCHSCHULE DARMSTADT, INSTITUT FUER CHEMISCHE TECHNOLOGIE, DARMSTADT (DE)
Bibliographic Reference: EUR 12693 EN (1990) 31 PP., FS, ECU 5 ISBN 92-826-1438-7 THE OFFICE FOR OFFICIAL PUBLICATIONS OF THE EUROPEAN COMMUNITIES, L-2985 LUXEMBOURG
Availability: Can be ordered online
ISBN: ISBN 92-826-1438-7
Record Number: 1989128091800 / Last updated on: 1990-11-02
Category: PUBLICATION
Original language: EN
Available languages: en