Stannate-Based Ceramic Oxide as Anode Materials for Oxide-Ion Conducting Low-Temperature Solid Oxide Fuel Cells

Abstract

Lanthanum-doped barium stannate, Ba 0.98 La 0.02 SnO 3 (LBS) ceramic oxide was developed as an alternative redox stable anode material for oxide-ion conducting, low-temperature solid oxide fuel cells (350-650 • C). LBS with ZnO as a sintering aid exhibited a high electronic conductivity of 216 S/cm at 650 • C under reducing gas conditions. A flexural strength of ∼66 MPa at 550 • C was obtained for ZnO-doped LBS; further investigation revealed that it can withstand 10 reduction-oxidation and thermal cycles. The performance of ZnO-doped LBS as an anode was determined with a GDC based electrolyte-supported SOFC. The catalytic activity for hydrogen oxidation and oxide conductivity was introduced by infiltration of Ni-GDC precursor. The maximum power densities of 0.28 W/cm 2 (at 0.6 A/cm 2 ) and 0.17 W/cm 2 (at 0.36 A/cm 2 ) was achieved at 650 and 600 • C, respectively, in humidified hydrogen as fuel for 2 wt% ZnO-doped LBS.

Investigation of Thermal, Structural and Electrical Properties of LaMnO<sub>3</sub>-Sigma

“…Towards the left below 1500 ohm of real impedance a small arc is expected. These arcs are usually related to the interfacial resistance between an electrolyte and a cathode (grain boundary conduction or charge transfer) at an intermediate frequency and the oxygen reduction reaction at the cathode surface (diffusion or concentration polarization) at a low frequency [14]. The above Figure 8 shows the comparison of the imaginary impedance with the variation of the frequency.…”

Flexural strength and flaw distributions of SrFe0.2Co0.4Mo0.4O3−δ ceramic‐supports for SOFCs at operating conditions

“…[2][3][4][5][6][7][8] A means of mitigating this problem is to use alternative, all ceramic anode system, such as La 1−x Sr x Cr 1−y Mn y O 3 , Sr 0.94 Ti 0.9 Nb 0.1 O 3−δ , Ba 0.98 La 0.02 SnO 3 , or Sr 2 MgMoO 6 (SMMO). [9][10][11][12][13][14][15] One new material of interest is the double perovskite SrFe 0.2 Co 0.4 Mo 0.4 O 3−δ (SFCM). 16 SFCM is a mixed ionic electronic conductor (MIEC) based on SMMO and other similarly structured anodes.…”

“…Redox cycling presents an additional challenge, especially in nickel‐based systems, because oxidation and reduction phase changes cause crack growth and failure after a few cycles . A means of mitigating this problem is to use alternative, all ceramic anode system, such as La 1− x Sr x Cr 1− y Mn y O 3 , Sr 0.94 Ti 0.9 Nb 0.1 O 3−δ , Ba 0.98 La 0.02 SnO 3 , or Sr 2 MgMoO 6 (SMMO) …”

Performance Analysis of an Intermediate Temperature Solid Oxide Electrolyzer Test Bench under a CO2-H2O Feed Stream

“…Solid oxide fuel cells (SOFCs) are able to convert hydrogen and/or carbon monoxide and oxygen-rich air [11,12] or biofuels produced by biomass gasification and anaerobic digestion [13,14] in electric energy with high conversion efficiency. Some research studies were conducted on innovative components' materials to reduce the SOFCs operating temperature [15][16][17][18][19][20].…”