Abstract

FZJ-2014-05465

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Investigations on a solid oxide cell after 6100 h operation in electrolysis mode

Tietz, F. (Corresponding Author)FZJ* ; Al Daroukh, M.FZJ* ; Schefold, J. ; Brisse, A. ; The, D. N. M. ; Schroeder, M.RWTH*

2014

Abstract: An electrode-supported solid oxide electrolysis cell (SOEC) was operated for 6100 h with a current density of -0.75 A/cm2 at a temperature of 780 °C indicating high stability and low voltage increase of 11 mV/kh. The cell consisted of a 10 µm thick solid electrolyte (yttria-stabilised zirconia, YSZ) and a diffusion barrier layer of gadolinium- substituted ceria, a Ni/YSZ cermet as hydrogen electrode and as mechanical support, and a La0.58Sr0.4Co0.2Fe0.8O3 perovskite as oxygen electrode. The electrodes as well as the YSZ and CGO layers were deposited on the electrode support by screen printing. Metallographic post-test analyses showed no significant changes in microstructure compared to the initial state. Investigations by means of scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy indicate material transport from the electrolyte into the diffusion barrier layer and pore formation at the hydrogen electrode /electrolyte interface.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)

Research Program(s):

1. 123 - Fuel Cells (POF2-123) (POF2-123)

Appears in the scientific report 2014

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