Multilayered Electrolyte-Supported SOFC Based on NEVZ-Ceramics Membrane

Abstract

SOFC batteries development is currently thriving in Russia (1). TVEL Fuel Company is a division of Rosatom State Corporation that promotes the SOFC technological platform, including cell, stacks, and integrated stack module for different applications. The technology development is based on R&D consortium between Institute of Solid State Physics Russian Academy of Sciences (ISSP RAS) with NEVZ-Ceramics (Novosibirsk, Russia) and includes materials synthesis and cost effective ceramic manufacturing methods for electrolyte supported flat cells with multilayered electrodes assembling for stack with metallic interconnectors from stainless steel Crofer 22H. Here we report on manufacturing and electrochemical tests of multilayered electrolytesupported SOFC based on NEVZ-ceramics membrane. 10Sc1CeSZ membranes of 50x50 mm 2 area and 250 microns thick were chosen as a support. NiO-10Sc1CeSZ and (La 0.8 Sr 0.2) 0.95 MnO 3-10Sc1CeSZ multilayered electrodes were deposited by print-screen technique. Electrochemical tests in two-chamber cell were evaluated in wide temperature range (700-900 o C) and different oxygen atmospheres.

Performance Optimization of Cermet SOFC Anodes: An Evaluation of Nanostructured NiO

“…Notice that thermal pre-treatment at 700 o C makes it possible to preserve submicron size of the particles (Fig.8); the extensive grain growth starts on heating above 900 o C. The former temperature was hence selected for the treatment of NiO powder introduced into the screen-printing paste for anode fabrication. The experimental procedures and conditions, used for the model SOFC fabrication, were analogous to those reported elsewhere (16). The cell architecture comprising twolayer electrodes applied onto each side of the solid electrolyte membrane of stabilized zirconia, is illustrated by the cross-section shown in Fig.9(A).…”

In-situ Raman spectroscopy analysis of the interfaces between Ni-based SOFC anodes and stabilized zirconia electrolyte

“…Characterization of the electrode materials and porous layers included X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM/TEM) coupled with energy dispersive spectroscopy (EDS), and thermogravimetric analysis (TGA); description of the equipment and experimental procedures can be found in Refs. [14,[18][19][20]. Typical anode microstructures are illustrated in Fig.2 (b-d).…”

“…The Ni-based cermet anode composition, thickness, morphology and deposition route were optimized in previous works [18,19]. Submicron NiO powder (Sigma Aldrich) was pre-annealed in air at 700C for 2 h to remove overstoichiometric oxygen and absorbed water [20].…”

“…The porous anodes were deposited onto one side of the SE disks, dried at 130C, and then sintered in air at 1250C for 3 h. Reduction of the anodes was performed in the course of Raman measurements. CE was made of a submicron composite consisting of 60 wt.% (La0.8Sr0.2)0.95MnO3 (LSM) and 40 wt.% 10Sc1CeSZ, as reported elsewhere [14,18]. Characterization of the electrode materials and porous layers included X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM/TEM) coupled with energy dispersive spectroscopy (EDS), and thermogravimetric analysis (TGA); description of the equipment and experimental procedures can be found in Refs.…”

In-Situ Raman Spectroscopy Studies of Oxygen Spillover at Solid Oxide Fuel Cell Anodes

“…The deposition was performed using two 85/15 at.%Zr/Y targets (size of 300x100x6 mm 3 , distance from the anode support of 10 cm)in Ar-O 2 mixture at 300 o C and operating total pressure of 0.3 Pa. Subsequent screen-printing of the ring-shaped cathodes made of lanthanum-strontium manganite (LSM), was similar to that in our previous reports [24][25][26][27]. The in-situ R a m a n s t u d i e s o f S O F C anodes were carried out using a combined experimental setup consisting of optical and electrochemical blocks.…”