Chromium deposition and poisoning on Ba0.9Co0.7Fe0.2Nb0.1O3−δ cathode of solid oxide fuel cells

Enhancing Oxygen Reduction Activity and Cr Tolerance of Solid Oxide Fuel Cell Cathodes by a Multiphase Catalyst Coating

“…Instead, MP catalyst powder was prepared for characterization by calcinating the dried infiltration solution at 750 °C for 1 h. As shown in Figure S2c, Supporting Information, the main peaks of the MP catalyst can be indexed to the BCFN phase (PDF‐04‐018‐5509) and BaCO 3 phase (PDF‐00‐045‐1471). [ 50,51 ] Typical nitrogen adsorption/desorption isotherm curves of bare LSCF and MP catalyst‐coated LSCF electrodes are shown in Figure S2d, Supporting Information. The observed type IV isotherm hysteresis indicates the formation of a mesoporous network in the MP catalyst‐coated LSCF.…”

“…BCFN cathode and PNM‐PrO x ‐coated LSCF cathode from refs. [ 51 ] and [ 20 ] , respectively, were added for comparison. b) EIS curves of bare LSCF and MP catalyst‐coated LSCF electrodes measured at different time at 750 °C in dry air with the presence of Cr contamination.…”

“…It is notable that the MP catalyst-coated LSCF cathode in this work shows a comparable stability but higher activity compared to the PNM-coated LSCF cathode reported previously (Figure 4a-iv). [20] Durability of the MP catalyst-coated LSCF cathode was further investigated [51] and [20] , respectively, were added for comparison. at a lower temperature of 650 °C for a longer period of time (500 h).…”

“…As for the MP catalyst-coated cathode, the LSCF surface is covered by BCFN and BaCO 3 phases. Although Ba-O segregations on the BCFN surface [28,51] may react with Cr species through reactions S4-S6 (Table 1, reaction energies between −148.5 and −103.9 kJ mol −1 ), the BaCO 3 phase in the outer layer of the MP coating is almost inert to Cr species due to the low reaction energies between BaCO 3 and Cr 2 O 3 or Cr(HO 2 ) 2 (−29.65 or −23.35 kJ mol −1 ).…”

“…Figure 4. a) Polarization resistance of bare LSCF and catalyst-coated LSCF electrodes as a function of time, measured under open circuit voltage (OCV) conditions at 750 °C in dry air (i), dry air with the presence of Cr contamination (ii), 3% H 2 O humidified air (iii), and 3% H 2 O humidified air with the presence of Cr contamination (iv). BCFN cathode and PNM-PrOx-coated LSCF cathode from refs [51]. and[20] , respectively, were added for comparison.…”