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...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.展开更多
基金supported by the Important Directional Project of'The Research and Exploration of Supercapacitor Storage System for Electric Vehicle'from Dalian Institute of Chemical Physics,Chinese Academy of Sciences,China~~
基金supported by the Important Directional Project of ' the Research and Exploration of Supercapacitor Storage System for Electric Vehicle' from Dalian Institute of Chemical Physics,Chinese Academy of Sciences,China~~
文摘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.
