Pr0.5Ba0.5Co0.7Fe0.25Nb0.05O3-δ as air electrode for solid oxide steam electrolysis cells. (3rd September 2019)

• Record Type: Journal Article
• Authors: Tao, Ze-Tian; Jiang, Yan-Mei; Lei, Libin; Chen, Fanglin
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 42(2019)
• Page Start: 23539
• Page End: 23546
• Publication Date: 2019-09-03
• Subjects: Air electrode materials -- Chemical stability -- Electrochemical performance -- Perovskite structure -- Solid oxide electrolysis cells; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.07.050
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Pr0.5 Ba0.5 Co0.7 Fe0.25 Nb0.05 O3-δ (PBCFN) is synthesized and evaluated as air electrode for solid oxide steam electrolysis cells (SOECs). X-ray diffraction and TEM analysis show that PBCFN has a pure tetragonal perovskite structure with a lattice fringe spacing of 0.39 nm for the (110) planes. When the applied voltage is set at 1.3 V, a relatively high electrolysis current density of 470 mA cm 2 at 800 °C is achieved for electrolyte-supported electrolysis cells with the cell configuration of Sr2 Fe1.5 Mo0.5 O6 (SFM)–Sm0.2 Ce0.8 O2 (SDC)/La0.8 Sr0.2 Ga0.87 Mg0.13 O3 (LSGM)/SDC–PBCFN. In addition, there is no obvious performance degradation during the short-term stability test of the above cells at a constant electrolysis voltage of 1.3 V, indicating that PBCFN is a promising air electrode for SOECs. Highlights: Pr0.5 Ba0.5 Co0.7 Fe0.25 Nb0.05 O3-δ (PBCFN) was evaluated as air electrode for SOECs. SOECs with PBCFN air electrode achieved a relatively high performance. Electrolysis current of 0.53 A/cm 2 was achieved in SOECs at 800oC and 1.3V. SOECs with PBCFN air electrode showed good short-term stability.