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Citation: Lu Zi-gui, Jiang Yi, Yan Jing-Wang, Dong Yong-Lai, Zhang Yi-Huang. Preparation and Structure and Performance Examination of Double-layer LSM/LSM+YSZ Composite Electrodes[J]. Acta Physico-Chimica Sinica, ;2000, 16(10): 941-947. doi: 10.3866/PKU.WHXB20001014 shu

Preparation and Structure and Performance Examination of Double-layer LSM/LSM+YSZ Composite Electrodes

1.
Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023

Received Date: 10 January 2000
Available Online: 15 October 2000

Single layer LSM＋ YSZ and double layers LSM/LSM＋ YSZ composite electrodes with varying YSZ content in the LSM＋ YSZ layer have been prepared. The electrochemical properties and microstructures of the electrodes were investigated and compared. The electrochemical performance of the single layer LSM＋YSZ electrodes was improved when a certain amount of YSZ was added due to the increase of the three phase boundaries (TPB) by the addition of YSZ, while excessive YSZ addition (60％ ) caused a decrease in performance, because the in-phase resistance of the electrode increased so high, leading to a reduced effective electrode area. The problem was eliminated by a double-layer LSM/LSM＋ YSZ composite electrode, in which a pure LSM layer functioned as a current collector and reduced the in-phase resistance.As a result, both large TPB area and low ohmic resistance were assured in this kind structure. At 1223 K, the double-layer composite electrode with 50 wt.％ YSZ has the lowest polarization resistance of 0.3Ω•cm2.
- SOFC,
- Composite LSM electrodes,
- Double-layer electrodes,
- AC impedance
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