Ultrafine, Dual-Phase, Cation-Deficient PrBa_0.8Ca_0.2Co₂O_5+δ Air Electrode for Efficient Solid Oxide Cells

Abstract

Nanostructured air electrodes play a crucial role in improving the electrocatalytic activity of oxygen reduction and evolution reactions in solid oxide cells (SOCs). Herein, we report the fabrication of a nanostructured BaCoO3-decorated cation-deficient PrBa0.8Ca0.2Co2O5+δ (PBCC) air electrode via a combined modification and direct assembly approach. The modification approach endows the dual-phase air electrode with a large surface area and abundant oxygen vacancies. An intimate air electrode–electrolyte interface is in situ constructed with the formation of a catalytically active Co3O4 bridging layer via electrochemical polarization. The corresponding single cell exhibits a peak power density of 2.08 W cm–2, an electrolysis current density of 1.36 A cm–2 at 1.3 V, and a good operating stability at 750 °C for 100 h. This study provides insights into the rational design and facile utilization of an active and stable nanostructured air electrode of SOCs.

Development of Nanostructured Lanthanum Strontium Cobalt Ferrite/Gadolinian-Doped Ceria Composite Electrodes of Solid Oxide Cells Formed by In Situ Polarization

“…The impurity phase decreases with an increase in the heat-treatment temperatures. Nevertheless, the presence of minor cobaltite and ferrite phases in nanostructured electrodes could be beneficial for the promotion of electrocatalytic activity and stability, as recently reported in multiple-phase cathodes of SOFCs. , …”

“…Nevertheless, the presence of minor cobaltite and ferrite phases in nanostructured electrodes could be beneficial for the promotion of electrocatalytic activity and stability, as recently reported in multiplephase cathodes of SOFCs. 43,44 As shown in the cross section of the GDC scaffold on YSZ sintered at 1200 °C for 2 h and LSCF-infiltrated GDC scaffold sintered at 700 and 750 °C for 2 h before polarization treatment (Figure S1), the surface of GDC particles is quite smooth, and they are well connected with each other (Figure S1a). The GDC particle size was about 200−500 nm, and the thickness of the GDC scaffold was ∼50 μm with a porosity of about 30%.…”

Facile Construction of Nanostructured Cermet Anodes with Strong Metal–Oxide Interaction for Efficient and Durable Solid Oxide Fuel Cells

“…According to the detailed impedance analyses under different atmospheric conditions and temperatures (Figure S9, Supporting Information), the HF arc occurs owing to the migration of oxygen ions at the electrodeelectrolyte interfaces, the MF arc occurs owing to the charge transfer at the TPBs of the electrodes, the LF arc occurs owing to the gas diffusion in the cathode, and the L′F arc occurs owing to the surface reaction on the anode. [37][38][39][40][41][42] The impedance spectra are fitted using an equivalent circuit (Figure S10, Supporting Information), and the fitting results are listed in Table S3 (Supporting Information). R H decreases with an increase in the GDC amount, owing to the enhanced migration of oxygen ions at the anode-electrolyte interface caused by the incorporation of the enhanced ion-conducting GDC phase in the anodes.…”

Electrochemically Assisted Construction of a La2NiO4+δ@Pt Core–Shell Structure for Enhancing the Performance and Durability of La2NiO4+δ Cathodes

“…NiO–Y 0.16 Zr 0.84 O 2 (YSZ, Tosoh) anode support was obtained by dry pressing, and the NiO-YSZ anode functional layer and YSZ film were deposited on the anode support by the slurry spin coating method and sintered at 1450 °C for 5 h. , Gd 0.1 Ce 0.9 O 1.95 (GDC) barrier layer was spin-coated on the YSZ film and sintered at 1150 °C for 2 h. The LNO ink was screen-printed on the GDC layer and sintered at 1100 °C for 2 h. A Pt ink was coated onto the cathode and dried at 150 °C. The YSZ film is approximately 13 μm thick, the GDC layer is 1.7 μm thick, the LNO electrode is 15 μm thick, and the Pt layer is 5 μm thick (Figure S2).…”

“…NiO− Y 0.16 Zr 0.84 O 2 (YSZ, Tosoh) anode support was obtained by dry pressing, and the NiO-YSZ anode functional layer and YSZ film were deposited on the anode support by the slurry spin coating method and sintered at 1450 °C for 5 h. 33,34 Gd 0.1 Ce 0.9 O 1.95 (GDC) barrier layer was spin-coated on the YSZ film and sintered at 1150 °C for 2 h.…”