Electrospun Core–Shell Fibers for High-Efficient Composite Cathode-Based Solid Oxide Fuel Cells

Abstract

Fibrous perovskite oxide has been the most promising cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs) due to its efficient mass and charge transfer. Herein, a core−shell fiber-structured YCo 0.5 Fe 0.5 O 3 (YCF)− Gd 0.1 Ce 0.9 O 1.95 (GDC) cathode is synthesized via the modified electrospinning technique. These unique YCF−GDC fibers exhibit a uniform diameter of 300 nm, and the GDC particles are attached to the YCF fiber cores. The electrochemical performance demonstrates a relatively low area-specific resistance of 0.66 Ω•cm 2 at 550 °C in air, which is much lower than 1.56 Ω•cm 2 of pure YCF fiber cathode. Moreover, the distribution of relaxation times (DRT) analysis results indicate that the introduction of GDC nanoparticles and the core−shell structure greatly facilitate oxygen-ion conduction and charge transfer processes, and the oxygen incorporation process plays a major role in the total polarization resistance. The NiO−GDC|GDC|fibrous YCF−GDC fuel cell shows a maximum power density of 426.5 mW•cm −2 at 550 °C. These results display that the core−shell fiber-structured YCF− GDC composite oxide is a promising candidate of highly active cathode for IT-SOFCs.

Review and Outlook on the Utilization of Low-Concentration Coalbed Methane for Power Generation by Solid Oxide Fuel Cells

“…Therefore, the development of cell materials and the optimization of the system structure of the low-concentration CBM-fueled SOFC are key research directions for the future. On the other hand, the research of cathode materials is also an important direction in which scholars are concerned. − The research of cathode materials has made some progress in recent years, and there has been a relevant review in this regard. − Furthermore, the scientific community has witnessed rapid advances in emerging materials, such as chalcogenides, which offer promising opportunities for developing anodes that exhibit improved stability and durability against carbon deposition and sulfur poisoning. Given the rapid advancement of material science research, the development of novel anode materials remains a critical research direction that holds significant potential for advancing SOFC technology in the future.…”

Progress on X-ray Absorption Spectroscopy for the Characterization of Perovskite-Type Oxide Electrocatalysts

“…Intermediate-temperature solid oxide fuel cells and solid oxide electrolysis cells with operating temperatures between 600 °C and 800 °C are the most promising solid-state ionic devices to be commercialized. ,− Mixed conducting perovskite oxides, such as Ba x Sr 1– x Co y Fe 1– y O 3−δ and La x Sr 1– x CoO 3−δ , La x Sr 1– x FeO 3−δ , and La x Sr 1– x Co y Fe 1– y O 3−δ have been extensively studied as cathode materials, because of their good ionic and electrical conductivity properties. , The operando XAS technique has also been successfully applied to investigate the dynamic change of these materials under operating conditions (e.g., various gas atmospheres, high temperatures, and applied polarization). Sr segregation on the surface of Sr-based perovskite oxides was the main reason for the poor oxygen reduction ability.…”

Enhanced ORR Activity of A-Site-Deficient SrCo0.8Nb0.1Ti0.1O3−δ as a Bifunctional Air Electrode for Low-Temperature Solid Oxide Fuel Cells

“…The main challenge for ILT-SOFCs is keeping the output power supply over 1000 mW cm –2 . Perovskite oxides with an ABO 3 structure have been developed as air electrode materials. − Alternative perovskite oxides with mixed ion and electron conduction (MIEC) have been employed for O-SOFCs and H-SOFCs. The MIEC allows the ORR active site to diffuse over the entire surface of the cathode to enhance ORR activity. − SrCoO 3−δ -based materials have received much attention owing to their superior oxygen ionic and electronic conductivity.…”