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Characteristics of LaCo1-xNixO3-δ Coated on Ni/YSZ Anode using CH4 Fuel in Solid Oxide Fuel Cells

  • Kim, Jun Ho (School of Chemical Engineering, Chonnam National University) ;
  • Jang, Geun Young (School of Chemical Engineering, Chonnam National University) ;
  • Yun, Jeong Woo (School of Chemical Engineering, Chonnam National University)
  • Received : 2020.03.06
  • Accepted : 2020.05.06
  • Published : 2020.11.30

Abstract

Nickel-doped lanthanum cobalt oxide (LaCo1-xNixO3-δ, LCN) was investigated as an alternative anode material for solid oxide fuel cells. To improve its catalytic activity for steam methane reforming (SMR) reaction, Ni2+ was substituted into Co3+ lattice in LaCoO3. LCN anode, synthesized using the Pechini method, reacts with yttria-stabilized zirconia (YSZ) electrolyte at high temperatures to form an electrochemically inactive phase such as La2Zr2O7. To minimize the interlayer by-products, the LCN was coated via a double-tape casting method on the Ni/YSZ anode as a catalytic functional layer. By increasing the Ni doping amount, oxygen vacancies in the LCN increased and the cell performance improved. CH4 fuel decomposed to H2 and CO via SMR reaction in the LCN functional layer. Hence, the LCN-coated Ni/YSZ anode exhibited better cell performance than the Ni/YSZ anode under H2 and CH4 fuels. LCN with 12 mol% of Ni (LCN12)-modified Ni/YSZ anode showed excellent long-term stability under H2 and CH4 conditions.