Nanoparticles Infiltration into SOFC Cathode Backbones

Abstract

Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFCs) with yttrium stabilized zirconia electrolyte were fabricated by the impregnation of nanoparticle promoters into specific backbone cathodes: electronic conductor La 0.8 Sr 0.2 MnO 3 , ionic conductor Sm 0.2 Ce 0.8 O 2-δ and mixed ionic and electronic conductor Nd 1.95 NiO 4+δ. The electrochemical performances of the symmetrical half-cells and single cells were improved using impregnated cathodes. The electrochemical measurements showed that a MIEC backbone is more efficient than a pure electronic or a pure ionic one. The highest area specific resistance was given by La 0.8 Sr 0.2 MnO 3-impregnated samples (ASR elec = 1.15 Ω.cm 2) at 700°C. At the same temperature, the lowest resistance was measured on a Pr 2 NiO 4+δ impregnated into an Nd 1.95 NiO 4+δ backbone (ASR elec = 0.26 Ω.cm 2). Complete single IT-SOFCs with and without infiltrated air electrodes have been then manufactured and the infiltration improved clearly the efficiency of the cell, more than 6% in the temperature range 650-750°C without specific optimization.

Surface decorations to abrupt change performance, robustness, and stability of electrodes for solid oxide cells

“…The sample is sintered at elevated temperatures so that the infiltrate particles can crystalize and bond to the backbone electrode. In some cases, the temperature for crystallization can be lower compared to its stand‐alone powder synthesis process, depending on the precursor 16–19 . As a common practice, La 1‐ x Sr x Co 1− y Fe y O 3− δ (LSCF) cathode is infiltrated with ceria‐based electrolyte materials.…”

“…In some cases, the temperature for crystallization can be lower compared to its stand-alone powder synthesis process, depending on the precursor. [16][17][18][19] As a common practice, La 1-x Sr x Co 1−y Fe y O 3−δ (LSCF) cathode is infiltrated with ceria-based electrolyte materials. SDC nanoparticles phase is formed and uniformly distributed on the surface of an LSCF backbone.…”

Electrochemical performance of La0.8Sr0.2MnO3 oxygen electrode promoted by Ruddlesden‐Popper structured La2NiO4

“…Using a nanosized second phase with ionic conduction also provides more reaction sites and speeds up the kinetics of the reactions . To date, numerous studies have been done on the effect of different nanocatalyst infiltration into the LSM air electrode backbone in SOCs . For instance, it has been shown that infiltration of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3− δ (BSCF) into the LSM backbone causes a 12 times decrease in the polarization resistance of air electrodes at 800°C .…”

“…5,6 To date, numerous studies have been done on the effect of different nanocatalyst infiltration into the LSM air electrode backbone in SOCs. [7][8][9][10][11][12][13][14] For instance, it has been shown that infiltration of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ (BSCF) into the LSM backbone causes a 12 times decrease in the polarization resistance of air electrodes at 800°C. 7 Although LSM is one of the most studied materials in the air electrode cases, the anodic polarization behavior is less investigated.…”