Performance variability of Ba0.5Sr0.5Co0.8Fe0.2O3−δ cathode on proton-conducting electrolyte SOFCs with Ag and Au current collectors

Tailoring cations in a perovskite cathode for proton-conducting solid oxide fuel cells with high performance

“…Despite the fact that making direct comparisons for SOFC tests is difficult due to the variability of many parameters, the cell using a BKSCF cathode, as reported in this study, showed a much larger power output than most of H-SOFCs using a BSCF-based cathode reported previously, 18,24,[55][56][57][58][59] which suggests that K-doping into BSCF can enhance the cathode catalytic activity, thus allowing a fuel cell performance improvement. The only exception is reported by An et al 60 In their study, proton-conducting SOFCs using single-phase BSCF cathode were fabricated.…”

Gluing Ba0.5Sr0.5Co0.8Fe0.2O3−δ with Co3O4 as a cathode for proton-conducting solid oxide fuel cells

“…5c indicate that the polarization resistance (R p ) of the cell is 0.036, 0.067, and 0.137 Ω cm 2 at 700, 650, and 600°C, respectively. These values are smaller than those of the BSCF-based cathodes for H-SOFCs, which are generally in the range of 0.1 to 0.4 Ω cm 2 at 700°C [39,40,[60][61][62][63]. One factor for the substantially reduced R p is the improved ORR activity of the BSCF + Co 3 O 4 compared with the aforementioned BSCF.…”

“…The PPD is lower than that of the cell using the aforementioned BSCF + Co 3 O 4 (8:2) cathode. [39]; NiO + BaCe 0.9 Y 0.1 O 3 /BaCe 0.9 Y 0.1 O 3 (20 μm)/BSCF + BaCe 0.9 Y 0.1 O 3 [40]; NiO + BaCe 0.8 Sm 0.2 O 3 /BaCe 0.8 Sm 0.2 O 3 (50 μm)/BSCF + BaCe 0.8 Sm 0.2 O 3 [60]; NiO + BCZY/BCZY (N/A)/BSCF [61]; NiO + BaCe 0.8 Sm 0.2 F 0.1 O 3 /BaCe 0.8 Sm 0.2 F 0.1 O 3 (50 μm)/Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 2.9 F 0.1 + BaCe 0.8 Sm 0.2 F 0.1 O 3 [62]; NiO + BCZY/BCZY (N/A)/BSCF [63]; NiO + BCZY/BCZY (14 μm)/BSCF + BCZY [66]; NiO + BCZY/BCZY (10 μm)/BSCF + BCZY [67].…”

Toward Reducing the Operation Temperature of Solid Oxide Fuel Cells: Our Past 15 Years of Efforts in Cathode Development

“…In principle, the proton-conducting electrolytes are superior to oxygen-ion-conducting electrolytes for lower operating temperatures as a result of the lower activation energy associated with the proton diffusion. However, as listed in Table , up to now, O 2– -SOFCs still show much higher power output than PCFCs at a reduced temperature (<650 °C). ,,,− This is mainly due to the fact that ideal cathodes specifically designed for PCFCs is not available. For example, the Ni-BaZr 0.4 Ce 0.4 Y 0.2 O 3-δ (Ni-BZCY442) anode-supported single cell with a BSCF cathode exhibited a PPD of 276 mW cm –2 at 600 °C, which is much lower than that of the Ni–SDC anode-supported single cell with a BSCF cathode (1010 mW cm –2 at 600 °C) at the same conditions. , We further modified BSCF via infiltrating Ag nanoparticles to improve the ORR activity of BSCF; the infiltrated Ag nanoparticles improved both the surface adsorption of O 2 and the charge transfer process, thus leading to an improved ORR activity.…”