Enhanced ORR activity of A-site deficiency engineered BaCo0·4Fe0·4Zr0·1Y0·1O3-δ cathode in practical YSZ fuel cells. (27th January 2021)

• Record Type: Journal Article
• Authors: Wang, Wei; Zhang, Xiaozhen; Khan, Kashif; Wu, Haodong; Zhang, Dandan; Yang, Yang; Jiang, Yuhua; Lin, Bin
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 7(2021)
• Page Start: 5593
• Page End: 5603
• Publication Date: 2021-01-27
• Subjects: Solid oxide fuel cell -- Cathode -- BaCo0·4Fe0·4Zr0·1Y0·1O3-δ -- A-site deficiency -- Oxygen reduction reaction; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.11.020
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Solid oxide fuel cell (SOFC) is becoming more and more attractive because of enormous progress, like high-performance and durable BaCo0 · 4 Fe0 · 4 Zr0 · 1 Y0 · 1 O3-δ (BCFZY) perovskite cathode at intermediate-to-low temperatures. Here, we propose an A-site deficient strategy to further enhance the oxygen reduction reaction (ORR) activity of BCFZY perovskite cathode for intermediate-temperature SOFC based upon commercial 8 mol% yttria-stabilized zirconia (YSZ) electrolyte. Both A-site deficient and stoichiometric BCFZY show a cubic perovskite structure without any impurity phases from room temperature to 1000 °C in air. A ten percent A-site deficiency in BCFZY cathode can dramatically reduce the area specific resistances (ARSs) from 0.73 Ω · cm 2 to 0.13 Ω · cm 2 at 650 °C in air, by a factor of 5.6 as compared with the stoichiometric BCFZY cathode. The YSZ-based SOFC with A-site deficient Ba0 · 9 Co0 · 4 Fe0 · 4 Zr0 · 1 Y0 · 1 O3-δ cathode showed the maximum power density of 730 mW · cm −2 at 800 °C increased to more than 2 times in comparison with stoichiometric BCFZY and the long-term stability of more than 50 hours without any degradation. The results have indicated that the introduction of A-site deficiency can dramatically improve the ORR activity of BCFZY, showing great promise as potential cathode materials in practical YSZ-based fuel cells. Graphical abstract: Image 1 Highlights: An A-site deficiency engineered BaCo0 · 4 Fe0 · 4 Zr0 · 1 Y0 · 1 O3-δ cathode is proposed. A-site deficiency greatly enhanced ORR activity of BaCo0 · 4 Fe0 · 4 Zr0 · 1 Y0 · 1 O3-δ . A-site deficiency reduced thermal expansion of BaCo0 · 4 Fe0 · 4 Zr0 · 1 Y0 · 1 O3-δ . A-site deficiency highly improved output performance of YSZ fuel cells. Ba0 · 9 Co0 · 4 Fe0 · 4 Zr0 · 1 Y0 · 1 O3-δ cathode showed good long-term stability.