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PrBa0.5Sr0.5Co1.5Fe0.5O5+δ composite cathode in protonic ceramic fuel cells
Im Seunghyeok,Lee Jong-Ho,지호일 한국세라믹학회 2021 한국세라믹학회지 Vol.58 No.3
The need for high performance of protonic ceramic fuel cells (PCFCs) has created significant interest in highly active cathode materials. Since a major charge carrier in PCFCs is proton, the use of triple conducting oxide (TCO) materials, in which oxygen ion, hole, and proton can be transported, is expected to improve the electrochemical performance of PCFCs. In this study, the applicability of PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+δ (PBSCF) cathode, known as TCO material, in PCFCs is investigated. The chemical compatibility of PBSCF with BaCe 0.55 Zr 0.3 Y 0.15 O 3–δ (BCZY3) proton-conducting electrolyte at high temperature is examined by XRD. To improve the interfacial structure between BCZY3 electrolyte and single-phase PBSCF cathode, PBSCF-BCZY3 composite layer is inserted between both layers. The optimization of sintering temperature and thickness of cathode results in the successful fabrication of PCFCs, exhibiting low ohmic resistance and high electrochemical performance.
Superparamagnetic NiO-doped mesoporous silica flower-like microspheres with high nickel content
Nabanita Pal,Seunghyeok Im,Eun-Bum Cho,Hyunhong Kim,Jongnam Park 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Morphology oriented synthesis of metal oxide doped silica structures have fascinating properties whichneeded to be explored extensively. In this work, NiO doped silica microsphere with beautifulflower-likemorphology has been achieved by adopting a facile surfactant-assisted synthetic route using CTAB-ammonia in H2O–ethanol mixed solvent media. The sol–gel synthesis with effective variations of Ni/Si ratiosup to 7.0, followed by a simple hydrothermal treatment and subsequent calcination leads to the formation ofNiO–silica mesostructures with high nickel content. Detailed structural and elemental characterizations byusing powder X-ray analysis (XRD), scanning electron (SEM) and transmission electron microscopy (TEM),N2 adsorption–desorption, X-ray photoelectron spectroscopy (XPS) revealed that single cubic phase NiOdoped mesoporous silica microspheres (for Ni/Si = 5:1 and 7:1) with good surface area (169 and 205 m2 g 1for sample with Ni/Si = 7:1 and 5:1, respectively) and pore width 3–5 nm, have been formed with 3Dflower-like shape and 500–600 nm particle size. These NiO–silica microspheres containing high Ni content up to 76wt% have shown excellent paramagnetic properties at room temperature.