Paper Title:
In Situ Synchrotron Measurement of Internal Stresses in Solid-Oxide Fuel Cell during Red-Ox Cycle

The internal stress in solid-oxide fuel cells (SOFCs) was evaluated during the thermal, reduction and re-oxidation cycles by using high-energy X-ray synchrotron radiation of about 70 keV at Beam line BL02B1 of SPring-8. The oxidized cell has a compression of about 400 MPa in the c-ScSZ electrolyte and a tension of 50-100 MPa in the NiO-YSZ anode at room temperature. In-situ measurement during the thermal cycle in an air atmosphere, the internal stress decreased with increasing temperature, becoming approximately zero at 1000 K. After the thermal cycle, the internal stress returned to its initial value. In the measurement during the reduction cycle, the internal stress was smaller than that measured during the cooling cycle after the anode was reduced from NiO-YSZ to Ni-YSZ. In the re-oxidation cycle of a reduced cell, the internal stress in the electrolyte went into tension above 800 K when the anode was re-oxidized from Ni-YSZ to NiO-YSZ. This tensile stress is responsible for possible fracture of unit cells in SOFCs.

Materials Science Forum (Volumes 571 - 572)
Edited by
A. R. Pyzalla, A. Borbély and H.-P. Degischer
Keisuke Tanaka et al., 2008, Materials Science Forum, 571-572, 339
Online since
March 2008
US$ 28,-
Authors: Yong Song Xie, Xin Ge Zhang, Mark Robertson, Radenka Maric, Dave Ghosh
Abstract:An SOFC must have sufficient mechanical strength and interface adhesion to ensure it can be handled without breakage during fabrication and...
Authors: Go Hiramatsu, Yoshihiro Hirata, Soichiro Sameshima, Naoki Matsunaga
Abstract:Gd-doped ceria electrolyte (Ce0.8Gd0.2O1.9, GDC, 700 μm thick), 30 vol% Ni-GDC cermet anode and perovskite cathode La0.6Sr0.4CoO3 (LSC) or...
Authors: Jürgen Malzbender, Rolf W. Steinbrech, Egbert Wessel
Abstract:Solid Oxide Fuel Cells (SOFCs) with electrical efficiencies above 50 % are considered as very promising option for future decentralized...
Authors: Norbert H. Menzler, Wolfgang Schafbauer, Feng Han, Oliver Büchler, Robert Mücke, Hans Peter Buchkremer, Detlev Stöver
Abstract:Solid oxide fuel cells (SOFCs) enable environmentally friendly energy to be produced with high efficiency. The market entry of SOFC systems...
Authors: Ying Qiang Xu, Lei Lei Wang, Qiong Wei Zhang
Chapter 7: Hydrogen and Fuel Cell
Abstract:The most commonly used Micro tubular solid oxide fuel cell (MT-SOFC) anode material is a two phase nickel and yttria stabilized zirconia...