Evaluation of Cr-Tolerance of the Sr₂Fe_1.5Mo_0.5O_6−δ Cathode for Solid Oxide Fuel Cells

Abstract

Sr2Fe1.5Mo0.5O6−δ (SFM) is a promising electrode material recently studied for intermediate temperature solid oxide fuel cells (IT-SOFCs). In this work, Cr-tolerance of SFM has been systematically assessed. Due to the presence of Sr at the A-site, SFM has been found to be vulnerable to Cr species that resulted from the metallic interconnects. The main product of Cr-poisoning for SFM is SrCrO4 deposited on the SFM surface. Furthermore, the Cr-poisoning mechanism of the SFM material has been evaluated both experimentally and thermodynamically. To enhance Cr-tolerance of SFM, LaCoO3−δ-infiltrated SFM (LC@SFM) has been developed. LC hinders the direct contact of SFM with Cr species, and LC@SFM has significantly enhanced Cr-tolerance compared with SFM. This study provides valuable guidance for the wide application of the SFM cathode in IT-SOFCs.

Tailoring Sr2Fe1.5Mo0.5O6−δ with Sc as a new single-phase cathode for proton-conducting solid oxide fuel cells

“…Sr 2 Fe 1.5 Mo 0.5 O 6−δ (SFM) is a well-investigated electrode for SOFCs because of its strong redox-ability [30], and it is frequently employed as the anode material rather than the cathode material for SOFCs because of its good catalytic activity under low oxygen partial pressure conditions [31][32][33]. Although various studies suggest that SFM may be utilized as the cathode for SOFCs [34,35], it is ineffective when compared with some other conventional perovskite materials. SFM has not been used for H-SOFCs for a long time due to its poor performance.…”

LaCrO3-Coated La0.6Sr0.4Co0.2Fe0.8O3−δ Core–Shell Structured Cathode with Enhanced Cr Tolerance for Intermediate-Temperature Solid Oxide Fuel Cells

“…A sol–gel method was adopted to synthesize LSCF powder and LCr powder. For the specific preparation method, refer to our previous studies. , La­(NO 3 ) 3 ·6H 2 O (99.9%, Alfa Aesar Chemicals) and Cr­(NO 3 ) 2 ·9H 2 O (98.5%, Alfa Aesar Chemicals) with a stoichiometric amount were dissolved into a mixed solvent consisting of isopropyl alcohol (VWR Chemicals, U.S.A.) and deionized water. Then glycine (99% Alfa Aesar Chemicals) was added as the chelating agent and polyvinylpyrrolidone (PVP, VWR Chemicals, U.S.A.) was used as the surfactant.…”

Segregation and interdiffusion processes in perovskites: a review of recent advances

“…The deficiency of strontium leads to the suppression of SrO formation, which, further, does not lead to the reactivity of the surface of cathode electrodes with volatile components of CrO x and, accordingly, to better stability. Such materials include Sr 1− x Co 0.5 Fe 0.2 Ti 0.1 Ta 0.1 Nb 0.1 O 3− δ , 193 SrFe 0.25 Ti 0.25 Co 0.25 Mn 0.25 O 3− δ , 194 multiphase catalyst coating Ba 1− x Co 0.7 Fe 0.2 Nb 0.1 O 3− δ , 195 Gd 0.1 Ce 0.9 O 2 coating layer, 196 LaCoO 3− δ -infiltrated Sr 2 Fe 1.5 Mo 0.5 O 6− δ , 197 dispersed yttrium-based nanooxides, 198 La 2 NiO 4± δ and Ba 0.5 Co 0.5 O x coated PrBa 0.8 Ca 0.2 Co 2 O 5+ δ . 199…”