Szczegóły publikacji
Opis bibliograficzny
Coupled A-site regulation and multicomponent B-site substitution in $SrFeO_{3-\delta}$-derived perovskites for active and durable oxygen reduction / Amir SULTAN, Xu Xu, Rameez ZAFAR, Laiba AMIR, Richard T. Baker, Martin Motola, Paweł Czaja, Fangjun Jin, Yihan Ling, Kun ZHENG // Applied Catalysis . B, Environment and Energy ; ISSN 0926-3373. — 2027 — vol. 402 art. no. 127439, s. 1–18. — Bibliogr. s. 16–18, Abstr. — Publikacja dostępna online od: 2026-09-02. — A. Sultan - dod. afiliacja: Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Krakow. — K. Zheng - dod. afiliacja: AGH Centre of Energy
Autorzy (10)
- AGHSultan Amir
- Xu Xu
- AGHZafar Rameez
- AGHAmir Laiba
- Baker Richard T.
- Motola Martin
- Czaja Paweł
- Jin Fangjun
- Ling Yihan
- AGHZheng Kun
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 170208 |
|---|---|
| Data dodania do BaDAP | 2026-09-23 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.apcatb.2026.127439 |
| Rok publikacji | 2027 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Applied Catalysis, B, Environmental |
Abstract
Efficient oxygen reduction and long-term structural stability remain difficult to achieve simultaneously in intermediate-temperature solid oxide fuel cells (IT-SOFCs), particularly for conventional SrFeO3−δ-based oxygen electrodes, which suffer from structural instability and performance degradation during prolonged operation. Herein, coupled A-site regulation and multicomponent B-site substitution engineering were implemented by simultaneously regulating the La/Sr ratio at the A site and introducing multicomponent substitution at the B site, yielding a SrFeO3−δ-derived multicomponent perovskite, La0.5Sr0.5Fe0.7Ti0.1Co0.1Mn0.1O3−δ (LSFTCMO-0.5). The optimized composition effectively regulated oxygen-defect chemistry, thereby promoting oxygen-reduction kinetics while simultaneously enhancing structural stability and reducing the thermal expansion coefficient. Consequently, LSFTCMO-0.5 exhibited a low polarization resistance of 0.071 Ω·cm2 at 700 °C and maintained stable electrochemical performance for 200 h. An anode-supported single cell delivered a peak power density of 802 mW·cm−2 at 800 °C and operated stably for over 200 h. Density functional theory calculations revealed that the superior electrochemical performance originates from a balance between oxygen-vacancy formation and oxygen-ion migration. Increasing the Sr content facilitates oxygen-vacancy formation but raises the migration barrier; therefore, the intermediate La/Sr composition provides an optimal compromise between oxygen-vacancy availability and mobility. Differential charge-density analysis further demonstrates that La/Sr regulation modifies the local electronic environment at the migration bottleneck, thereby accounting for the composition-dependent migration barriers. This work establishes coupled A-site regulation and multicomponent B-site substitution engineering as an effective strategy for balancing oxygen-defect thermodynamics and migration kinetics, providing a rational design principle for high-performance oxygen electrodes in IT-SOFCs.
