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Nanostructured Double Perovskite Cathode With Low Sintering Temperature For Intermediate Temperature Solid Oxide Fuel Cells
Author(s) -
Kim Seona,
Jun Areum,
Kwon Ohhun,
Kim Junyoung,
Yoo Seonyoung,
Jeong Hu Young,
Shin Jeeyoung,
Kim Guntae
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201500509
Subject(s) - materials science , cathode , yttria stabilized zirconia , microstructure , sintering , electrolyte , anode , oxide , solid oxide fuel cell , chemical engineering , perovskite (structure) , polarization (electrochemistry) , electrochemistry , cubic zirconia , composite material , ceramic , metallurgy , electrode , chemistry , engineering
This study focuses on reducing the cathode polarization resistance through the use of mixed ionic electronic conductors and the optimization of cathode microstructure to increase the number of electrochemically active sites. Among the available mixed ionic electronic conductors (MIECs), the layered perovskite GdBa 0.5 Sr 0.5 CoFeO 5+ δ (GBSCF) was chosen as a cathode material for intermediate temperature solid oxide fuel cells owing to its excellent electrochemical performance and structural stability. The optimized microstructure of a GBSCF–yttria‐stabilized zirconia (YSZ) composite cathode was prepared through an infiltration method with careful control of the sintering temperature to achieve high surface area, adequate porosity, and well‐organized connection between nanosized particles to transfer electrons. A symmetric cell shows outstanding results, with the cathode exhibiting an area‐specific resistance of 0.006 Ω cm 2 at 700 °C. The maximum power density of a single cell using Ce–Pd anode with a thickness of ∼80 μm electrolyte was ∼0.6 W cm −2 at 700 °C.