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The anode/electrolyte interface ш solid oxide fuel cells (SOFC) is known to cause electrical losses. Geometrically simple Ni yttria-stabilised zirconia (YSZ) interfaces were examined to gain information on the structural and chemical changes occurring during experiments at 1000°C in an atmosphere of 97% H2/3% H20. Electrochemical impedance spectroscopy at open circuit voltage (OCV) and at anodic and cathodic polarisations (100 mV) was performed. A correlation of the electrical data with the structure development and the chemical composition was attempted. Nickel wires with different impurity content (99.8% Ni and 99.995% Ni) were used to examine the impact of impurities on the polarisation resistance and contact area morphology. The electropolished nickel wires were pressed against a polished 8 mol% YSZ surface.Extensive structural changes from a flat interface to a lull and valley structure were found to occur ш the contact area with the impure nickel wire, and a ridge of impurities was built along the rim of the contact area. Impurity particles in the interfacial region were also observed. The impurity phase was described as an alkali silicate glassy phase. No differences were fo

Who reads The Ni-YSZ interface : structure, composition and electrochemical properties at 1000°C?

Author

Jensen Karin Vels

Publisher

Risø DTU - National Laboratory for Sustainable Energy : available from: Risø National Laboratory, Information Service Department

Published

2002

Language

EN

ISBN

9788755030428

Category

nonfiction

Subjects

Computer Science, Stem