Electrochemical performance and stability of La_0.2Sr_0.8Ti_0.9Ni_0.1O_3-δ and La_0.2Sr_0.8Ti_0.9Ni_0.1O_3-δ - Gd_0.2Ce_0.8O_2-δ anode with anode interlayer in H₂ and CH₄

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• 作者：Byung Hyun Park ; Gyeong Man Choi ; ^{gmchoi@postech.ac.kr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：SOFC ; Stability ; Anode interlayer ; Composite anode ; Ex-solution
• 刊名：Electrochimica Acta
• 出版年：2015
• 出版时间：10 November 2015
• 年：2015
• 卷：182
• 期：Complete
• 页码：39-46
• 全文大小：1417 K

文摘

Donor-doped SrTiO₃ is a promising material for use as an alternative anode to solve stability problems due to carbon coking or Ni coarsening etc. of conventional Ni-cermet anodes. Electro-catalytic Ni nanoparticles can be produced in La and Ni co-doped SrTiO₃ or La_0.2Sr_0.8Ti_0.9Ni_0.1O_3-δ (LSTN) anode when it is exposed to a reducing atmosphere. In this work, we study the effects of Gd_0.2Ce_0.8O_2−δ (GDC) either as an anode interlayer (between anode and electrolyte) or as a composite phase in an anode composed of La and Ni co-doped SrTiO₃ (La_0.2Sr_0.8Ti_0.9Ni_0.1O_3-δ, LSTN). The electrochemical performance (i.e., impedance spectra and power density) of electrolyte-supported cells in which scandia-stabilized zirconia (ScSZ) is used as an electrolyte and LSTN or LSTN-GDC is used as the anode, are examined and compared at 800 °C in H₂ and CH₄ fuels. LSTN anode was stable and had improved performance in both H₂ and CH₄ fuels when GDC was composited and also used as an anode interlayer. A significant reduction of anodic polarization resistance in CH₄ gas is clearly demonstrated.