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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.125  No.4 (April) (2017)  >  pp.218-222

Journal of the Ceramic Society of Japan
<<Previous article Vol.125  No.4 (April) (2017)   pp.218 - 222 Next article>>

High durability of La0.6Sr0.4Co0.2Fe0.8O3−δ/samaria-doped ceria (SDC) composite oxygen electrode with SDC interlayer for reversible solid oxide fuel cell/solid oxide electrolysis cell

Kazuki SHIMURA1), Hanako NISHINO2), Katsuyoshi KAKINUMA2), Manuel E. BRITO3), Hiroyuki UCHIDA2) 3)
1) Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi 2) Fuel Cell Nanomaterials Center, University of Yamanashi 3) Clean Energy Research Center, University of Yamanashi

We have examined the long-term durability of a La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF)–samaria-doped ceria (SDC) composite oxygen electrode with SDC interlayer for reversible solid oxide cells (R-SOCs). A symmetrical cell with the configuration: LSCF–SDC|SDC interlayer|yttria-stabilized zirconia (YSZ) electrolyte|SDC interlayer|LSCF–SDC, was operated at 900°C and a constant current density of 0.5 A cm−2 with the top electrode as the anode (O2 evolution). The IR-free overpotentials at both the anode and cathode were virtually constant during 5500 h of operation. The value of ohmic resistance at the anode side (RA) increased slightly, whereas that at the cathode side (RC) increased markedly. The I–E performance of the bottom electrode (operated as the cathode), that was measured from −1.0 to 1.0 A cm−2 every 1000 h, degraded specifically at high current densities. It was found that the thickness, pore size, and porosity in both electrodes were unchanged, but the distribution of the Sr component changed markedly at both the LSCF–SDC/SDC interlayer and SDC interlayer/YSZ interfaces. While the diffusion of the Sr component from the anode was limited within the SDC interlayer, the Sr component from the cathode reached the SDC interlayer/YSZ interface, which could increase the RC, likely due to the formation of SrZrO3. However, the diffusion rates of Sr were found to be noticeably slowed down at dense portions of the SDC interlayer. Hence, it is essential to prepare a dense, uniform SDC interlayer to improve both the durability and performance of R-SOCs.


Keyword:
Interlayer, LSCF, Solid oxide fuel cell, Solid oxide electrolysis cell, Durability

Received: November 14, 2016
Accepted: December 13, 2016 , Published online: April 03, 2017

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