A CO2-tolerant La2NiO4+delta-coated PrBa0.5Sr0.5Co1.5Fe0.5O5+delta cathode for intermediate temperature solid oxide fuel cells

作者：Li, Jin; Zhang, Qian; Qiu, Peng; Jia, Lichao; Chi, Bo; Pu, Jian; Li, Jian

来源：Journal of Power Sources, 2017, 342: 623-628.

DOI：10.1016/j.jpowsour.2016.12.106

• Solid oxide fuel cell
• LN-coated PBSCF cathode
• Double perovskite
• Ruddlesden-Popper
• CO2 tolerance

La2NiO4+delta (LN)-coated PrBa0.5Sr0.5Co1.5Fe0.5O5+delta (PBSCF) composite cathode, designated as PBSCF-LN, for the intermediate temperature solid oxide fuel cells (IT-SOFCs) is prepared by solution infiltration, and investigated comparatively with single phase PBSCF cathode in the half and full cells using Ag and/or Pt paste as the current collector. Compared with Pt, Ag current collector results in a decrease of cathode polarization resistance (R-p) by an order of magnitude, which suggests that Ag is electrocatalytically active and not suitable for the use of studying the cathode performance of IT-SOFCs. The R-p value of PBSCF-LN cathode is significantly lower than that of PBSCF cathode, no matter whether Pt or Ag current collector is used for the measurement. High power densities ranging from 0.24 to 0.94 W cm(-2) at temperatures between 600 and 750 degrees C are achieved using a full cell with PBSCF-LN cathode. Upon exposure to a CO2-rich atmosphere, carbonate particles are formed on the surface of PBSCF cathode, causing irreversible degradation of electrochemical performance. In contrast, the surface of PBSCF-LN cathode remains clean, and its performance degradation due to CO2 adsorption is recoverable.

• 出版日期2017-2-28
• 单位华中科技大学