Ba-deficiency in BaCoO3 cathode allows high performance for proton-conducting solid oxide fuel cells

A Highly Efficient and Robust Bifunctional Perovskite‐Type Air Electrode with Triple‐Conducting Behavior for Low‐Temperature Solid Oxide Fuel Cells

“…are reportedly two pivotal parameters associated with oxygen activation and proton uptake for cathodes, respectively. [62,63] As shown in Figure 6b a more energetically favorable system for oxygen reduction and protonation in BFCS0.95. The driving force of hydration reaction (H 2 O + a more remarkable adsorption/desorption capacity of electrons for BFCS0.95, thus contributing to higher electrochemical activity.…”

A review of progress in proton ceramic electrochemical cells: material and structural design, coupled with value-added chemical production

“…72 Moreover, Shi et al demonstrated that the deficiency of 5% Ba in the BaCoO 3 air electrode could improve the protonation ability and reduce the energy barrier in the proton migration process according to first-principles calculations. 61 And the surface catalytic activity of O 2 and the chemical stability of the Ba 0.95 CoO 3 compound are also strengthened. 61 Notably, an A-site defective perovskite of Sr x (Y y (Nb 0.1 Co 0.9 ) 1− y )O 3− δ (SYNC) and the new interface of SrWO 4 (SWO) that matches the electrolyte thermal expansion coefficient (TEC) are in situ formed by the reaction between the negative thermal expansion material of Y 2 W 3 O 12 (YWO, a TEC of about −7 × 10 −6 K −1 ) and the active electrode material of SrNb 0.1 Co 0.9 O 3− δ (SNC, a TEC of 19–24 × 10 −6 K −1 ), 73 which simultaneously achieved improved thermo-mechanical compatibility and highly reactive electrodes.…”

“…58 For example, the integrity of the ABO 3 structure could still be preserved even if there is a portion of deficiency in either the A-site or the B-site. The most reported cation deficiencies are within 10%, [59][60][61] but they could reach up to 27%. 62 The formation of cation deficiencies could introduce additional oxygen vacancies in the perovskite without impairing the original crystal structure.…”

Enhanced ORR Activity of A-Site-Deficient SrCo0.8Nb0.1Ti0.1O3−δ as a Bifunctional Air Electrode for Low-Temperature Solid Oxide Fuel Cells

“…have proved that a little deficiency of Ba in BaCoO 3 could improve its performance as a cathode for proton-conducting solid oxide fuel cells (H-SOFCs). The explanation is that the lack of Ba improves the protonation of the material, reduces the chemical energy barrier during proton migration, and enhances the surface catalytic activity toward oxygen. , Accordingly, the A-site deficiency strategy could improve the performance of both O-SOFCs and H-SOFCs.…”

“…The explanation is that the lack of Ba improves the protonation of the material, reduces the chemical energy barrier during proton migration, and enhances the surface catalytic activity toward oxygen. 38,39 Accordingly, the A-site deficiency strategy could improve the performance of both O-SOFCs and H-SOFCs.…”