Multi-layer thin-film electrolytes for metal supported solid oxide fuel cells

Oxidation studies of anodes layer microstructures in metal supported solid oxide fuel cells

“…The compressive stress due to electrolyte layer deposition of about 1 GPa [14] probably largely diminishes at operation temperatures [26]. The critical strain for electrolyte fracture at elevated temperature is around 0.17% [27], hence electrolyte cracking due to the oxidation induced strain could be expected, which was also observed (see below).…”

“…Details on the cell design have been reported in previous studies [11,10,14]. A corrosion-resistant porous metal acts as mechanical support.…”

“…It is coated with a thin Ce 0.8 Gd 0.2 O 1.9 (CGO) diffusion barrier layer (DBL) in a magnetron sputter process to avoid interdiffusion. This DBL prevents the diffusion of Ni from the anode into the substrate and the diffusion of Fe and Cr from the substrate into the anode [14]. Subsequently a $ 60 μm thick graded Ni/8YSZ-anode structure (Ni: nickel, 8YSZ: 8 mol% Y 2 O 3 -ZrO 2 ) is deposited via multiple-step screen printing and then sintering is carried out in H 2 which results in reduced as-produced state of the anode layer, followed by gas-flow sputtering of the dense and very thin 8YSZ electrolyte (around 3-4 μm).…”

“…Subsequently a $ 60 μm thick graded Ni/8YSZ-anode structure (Ni: nickel, 8YSZ: 8 mol% Y 2 O 3 -ZrO 2 ) is deposited via multiple-step screen printing and then sintering is carried out in H 2 which results in reduced as-produced state of the anode layer, followed by gas-flow sputtering of the dense and very thin 8YSZ electrolyte (around 3-4 μm). Details on the gas-flow sputtering process can be found in [14]. Afterwards another CGO-DBL is magnetron sputtered to avoid zirconate formation between the electrolyte and the La 1À x Sr x Co 1À y Fe y O 3 cathode (LSCF), which is screen printed (40-50 μm) followed by in-situ sintering during the first heating up of the cell.…”

LZS/Al2O3 Glass-Ceramic Composites Sintered by Fast Firing

“…Furthermore, in applications involving the joining of materials, the thermal expansion requires a fairly narrow compatibility to match the shrinkage, as in glass and glass-ceramic/metal systems for hermetic seals, laser tubes, electronic devices for measuring and monitoring, sealants for solid oxide fuel cells (SOFCs), and substrates used in microelectronic packaging on LTCC technology (low temperature co-fired ceramics) [15][16][17][18][19] . In previous works 20,21 it was demonstrated that the addition of nanosized alumina in a LZS glass-ceramic matrix, produced by conventional sintering, was able to reduce the CTE significantly.…”