Elastic configurations of self-supported oxide membranes for fuel cells

When two become one: An insight into 2D conductive oxide interfaces

“…The lattices differences of the two phases result in slight distortions and/or occasional defects which are mostly localized at the interface and involve few atomic layers [97]. Some examples of such defects resulting in crystalline disorder are linear dislocations, vacancies-dopant associates and especially lattice strain resulting from atomic peening, which occurs to reduce the interfacial energy during the deposition [98]. In thin films deposition, in the case of large mismatch between the substrate and the film, the occurrence of dislocations starts soon after film formation to accommodate the large mismatch with typically large mosaic spread accompanied by columnar growth.…”

The effect of mechanical twisting on oxygen ionic transport in solid-state energy conversion membranes

“…Here, fabrication of the device is achieved by freeetching the substrate area underneath an electrolyte film forming a strained and buckled ionic conducting membrane [27][28][29] . Very recently, the residual stress and buckling profiles of free-standing yttria-stabilized-zirconia membranes were investigated by optical microscopy 30,31 and interferometry 11,32 . Numeric simulations based on the Rayleigh-Ritz or von Karman methods were used to analyse the membrane stress patterns with respect to their thickness 11 , buckling geometry 32 , membrane aspect ratio 30 , or film deposition temperature 31 .…”

Solid-oxide fuel cells

“…The significant difference of thermal expansion coefficient (TEC) between silicon (TEC Si ¼ 3 Â 10 À6 K À1 ) and state-of-the-art electrolyte materials (TEC YSZ ¼ 10 Â 10 À6 K À1 ). This can lead to thermomechanical failure (membrane fracture, cracks) when heating the membranes up to the operating temperatures (Kerman, Tallinen, Ramanathan, & Mahadevan, 2013). Depositing compressively stressed films is highly beneficial for the mechanical stability of the membranes .…”

“…The buckled pattern appeared when releasing the membrane and ensures the thermomechanical stability of the membranes up to 800 CKerman et al, 2013;T€ olke, Gauckler, Kunz, Krauss, & Prestat, 2013).…”