TY - JOUR
T1 - Performance of anode-supported solid oxide fuel cell with La0.85Sr0.15MnO3 cathode modified by sol-gel coating technique
AU - Yoon, Sung Pil
AU - Han, Jonghee
AU - Nam, Suk Woo
AU - Lim, Tae Hoon
AU - Oh, In Hwan
AU - Hong, Seong Ahn
AU - Yoo, Young Sung
AU - Lim, Hee Chun
N1 - Funding Information:
This work was supported by Grant no. 2U02460 from Korea–Japan partnership research program and no. 1999-2-301-001-3 from the interdisciplinary research program of the Korea Science and Engineering Foundation (KOSEF).
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2002/4/1
Y1 - 2002/4/1
N2 - Yttria-stabilized zirconia (8mol%; YSZ) or samaria-doped ceria (Sm0.2Ce0.8O2; SDC)-modified La0.85Sr0.15MnO3 (LSM) composite cathodes were fabricated by formation of an YSZ or SDC film at the triple-phase boundary (TPB) of LSM/YSZ/gas. The YSZ film greatly enlarged the number of electrochemical reaction sites (ERSs) by increasing the TPB. The composite cathode was formed on thin YSZ electrolyte (about 30 μm thickness) supported on an anode and then I-V characterization and ac impedance analyses were performed at temperatures between 700 and 800 °C. As a result of the impedance analysis on the cell at 800 °C, with humidified hydrogen as the fuel and air as the oxidant, the element R1 around the frequency of 1000 Hz is identified as the anode polarization, R2 around the frequency of 100 Hz is identified as the cathode polarization and R3 below the frequency of 10 Hz is the resistance of gas phase diffusion through the anode. The maximum power densities of the cell modified by the SDC sol-gel coating were about 0.53W/cm2 at 750 °C and about 0.19W/cm2 at 650 °C. The result implied that deposition of SDC in the pore surface of the cathode increased the area of the TPB, resulting in a decrease of cathode polarization and improved cell performance.
AB - Yttria-stabilized zirconia (8mol%; YSZ) or samaria-doped ceria (Sm0.2Ce0.8O2; SDC)-modified La0.85Sr0.15MnO3 (LSM) composite cathodes were fabricated by formation of an YSZ or SDC film at the triple-phase boundary (TPB) of LSM/YSZ/gas. The YSZ film greatly enlarged the number of electrochemical reaction sites (ERSs) by increasing the TPB. The composite cathode was formed on thin YSZ electrolyte (about 30 μm thickness) supported on an anode and then I-V characterization and ac impedance analyses were performed at temperatures between 700 and 800 °C. As a result of the impedance analysis on the cell at 800 °C, with humidified hydrogen as the fuel and air as the oxidant, the element R1 around the frequency of 1000 Hz is identified as the anode polarization, R2 around the frequency of 100 Hz is identified as the cathode polarization and R3 below the frequency of 10 Hz is the resistance of gas phase diffusion through the anode. The maximum power densities of the cell modified by the SDC sol-gel coating were about 0.53W/cm2 at 750 °C and about 0.19W/cm2 at 650 °C. The result implied that deposition of SDC in the pore surface of the cathode increased the area of the TPB, resulting in a decrease of cathode polarization and improved cell performance.
KW - Anode-supported SOFC
KW - High performance cathode
KW - Impedance analysis
KW - Reduced-temperature SOFCs
KW - Sol-gel coating
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U2 - 10.1016/S0378-7753(01)01037-0
DO - 10.1016/S0378-7753(01)01037-0
M3 - Conference article
AN - SCOPUS:0036535194
SN - 0378-7753
VL - 106
SP - 160
EP - 166
JO - Journal of Power Sources
JF - Journal of Power Sources
IS - 1-2
T2 - 7th Grove Fuel Cell Symposium, Grove VII
Y2 - 11 September 2001 through 13 September 2001
ER -
