Study on the extension of reaction zone from Ni/YSZ interface by using fixed film electrodes

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:242527

Nakagawa, Nobuyoshi; Sakurai, Hiroyuki; Kondo, Kenichiro; Kato, Kunio ^[1]

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1. Gunma Univ., Kiryu, Gunma (Japan). Dept. of Biological and Chemical Engineering

Effect of Ni film thickness and the porous ceramic layer thickness on polarization at the anode of SOFC was measured by using the fixed film electrode at around 1,273 K. The electrode impedance was dependent on the thickness of the porous layer but not on that of Ni film. On the other hand, de polarization was affected by neither thickness at high partial pressure of hydrogen. Effective reaction zone for the rate determining process was evaluated as less than 1 gm along the Ni thickness from the electrode/electrolyte. Not a diffusion process, but an activation process should be important for the rate determining step. P{sub H{sub 2}} and P{sub H{sub 2}O} dependencies of the interface resistance were similar to that which have been obtained from a Ni pattern electrode and a Ni-YSZ cermet electrode by other researchers.

• OSTI ID: 242527
• Report Number(s): CONF-950683--; ISBN 1-56677-095-5
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
CERMETS
ELECTRICAL PROPERTIES
ELECTRODES
EXPERIMENTAL DATA
HYDROGEN
INTERFACES
NICKEL
PARAMETRIC ANALYSIS
PARTIAL PRESSURE
SOLID ELECTROLYTE FUEL CELLS
WATER VAPOR
YTTRIUM OXIDES
ZIRCONIUM OXIDES