Co- and Ce/Co-coated ferritic stainless steel as interconnect material for Intermediate Temperature Solid Oxide Fuel Cells
Artikel i vetenskaplig tidskrift, 2017

Chromium species volatilization, oxide scale growth, and electrical scale resistance were studied at 650 and 750 °C for thin metallic Co- and Ce/Co-coated steels intended to be utilized as the interconnect material in Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFC). Mass gain was recorded to follow oxidation kinetics, chromium evaporation was measured using the denuder technique and Area Specific Resistance (ASR) measurements were carried out on 500 h pre-exposed samples. The microstructure of thermally grown oxide scales was characterized using Scanning Electron Microscopy (SEM), Scanning Transmission Electron Microscopy (STEM), and Energy Dispersive X-Ray Analysis (EDX). The findings of this study show that a decrease in temperature not only leads to thinner oxide scales and less Cr vaporization but also to a significant change in the chemical composition of the oxide scale. Very low ASR values (below 10 m? cm2) were measured for both Co- and Ce/Co-coated steel at 650 and 750 °C, indicating that the observed change in the chemical composition of the Co spinel does not have any noticeable influence on the ASR. Instead it is suggested that the Cr2O3 scale is expected to be the main contributor to the ASR, even at temperatures as low as 650 °C.

Coating

Area specific resistance

Interconnect

Corrosion

Cr vaporization

Solid oxide fuel cell

Författare

Hannes Falk Windisch

Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Julien Claquesin

Chalmers University of Technology

Mohammad Sattari

Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Jan-Erik Svensson

Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Jan Froitzheim

Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Journal of Power Sources

0378-7753 (ISSN)

Vol. 343 1-10

Fundament

Grundläggande vetenskaper

Ämneskategorier

Kemi

DOI

10.1016/j.jpowsour.2017.01.045