Details

Autor(en) / Beteiligte

• Han, Nan
• Ren, Rongzheng
• Ma, Minjian
• Xu, Chunming
• Qiao, Jinshuo
• Sun, Wang
• Sun, Kening
• Wang, Zhenhua

Titel

Sn and Y co-doped BaCo0.6Fe0.4O3-δ cathodes with enhanced oxygen reduction activity and CO2 tolerance for solid oxide fuel cells

Ist Teil von

• Chinese chemical letters, 2022-05, Vol.33 (5), p.2658-2662

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Applying mixed oxygen ionic and electronic conducting (MIEC) oxides as the cathode offers a promising solution to enhance the performance of solid oxide fuel cells (SOFCs). However, the phase instability in CO2-containing air and sluggish oxygen reduction activity of MIEC cathodes remain a long-term challenge for optimizing the electrochemical performance of SOFCs. Herein, a heterovalent co-doping strategy is proposed to enhance the oxygen reduction activity and CO2 tolerance of SOFCs cathodes, which can be demonstrated by developing a novel BaCo0.6Fe0.4O3-δ (BCF)-based MIEC oxide, BaCo0.6Fe0.2Sn0.1Y0.1O3-δ (BCFSY). In addition to improving the stability of BCF-based perovskites, this strategy achieves an optimized balance of ionic mobility and oxygen vacancies due to the synergies between the effects of the co-dopants. Compared with single-doped materials, BCFSY exhibits improved CO2 tolerance and considerably higher ORR activity, which is reflected in a significantly lower polarization resistance of 0.15 Ω cm2 at 600 °C. The results of this work provide an efficient tactic for designing electrode materials for SOFCs. BaCo0.6Fe0.2Sn0.1Y0.1O3-δ (BCFSY), heterovalent co-doping by Sn and Y, enhance the CO2 tolerance and ORR catalytic activity, achieving an optimized balance of ionic mobility and oxygen vacancies due to the synergistic effect. [Display omitted]