Enhancing the oxygen reduction activity of PrBaCo2O5+δ double perovskite cathode by tailoring the calcination temperatures. (30th September 2020)

• Record Type: Journal Article
• Authors: Gu, Hongxia; Yang, Guangming; Hu, Ye; Liang, Mingzhuang; Chen, Sihang; Ran, Ran; Xu, Meigui; Wang, Wei; Zhou, Wei; Shao, Zongping
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 48(2020)
• Page Start: 25996
• Page End: 26004
• Publication Date: 2020-09-30
• Subjects: Solid oxide fuel cell -- Low-temperature calcination -- PrBaCo2O5+δ -- Oxygen reduction reaction; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.12.171
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this study, the oxygen reduction activity of PrBaCo2 O5+δ (PBC) double perovskite is remarkably enhanced by rationally tuning the calcination temperatures of the cathode precursor for solid oxide fuel cells (SOFCs). Effects of the calcination temperatures on the phase structure, microstructure, surface area and oxygen reduction reaction (ORR) activity of PBC cathode is systematically investigated. The cathode with optimized calcination temperature (900 °C, PBC-900) shows excellent activity and stability for ORR at 600 °C in terms of area specific resistances (ASRs). A distinctive low ASR of 0.068 Ω cm 2 is obtained at 600 °C for PBC-900, which is 92.6%, 34.6% and 15.0% lower than PBC-800, PBC-1000 and PBC-1100, respectively. After operating for 250 h in air at 600 °C, the ASR value of PBC-900 is not significantly reduced. Furthermore, a single cell with PBC-900 cathode delivers attractive peak power density of 1.60 W cm −2 at 600 °C. The present study suggests that the ORR activity of PBC cathode can be greatly boosted by rationally tailoring the calcination temperatures, which may bring new avenue for the design of highly active cathodes for SOFCs. Graphical abstract: Image 1 Highlights: Effects of calcination temperatures of PBC cathode precursor are studied. The optimum calcination temperature of PBC precursor is 900 °C. The Rp of PBC-900 cathode on SDC electrolyte is as low as 0.068 Ω cm 2 at 600 °C. Peak power density of Ni + SDC.|SDC|PBC-900 single cell attains 1.60 W cm −2 at 700 °C. ORR activity of cathode can be boosted by tailoring the calcination temperatures.