Characteristics of LaCo_1-xNi_xO_3-δ coated on Ni/YSZ anode using CH₄ fuel in solid oxide fuel cells

Abstract

Nickel-doped lanthanum cobalt oxide (LaCo 1-x Ni x O 3-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, Ni 2 + was substituted into Co 3 + lattice in LaCoO 3. 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 La 2 Zr 2 O 7. 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. CH 4 fuel decomposed to H 2 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 H 2 and CH 4 fuels. LCN with 12 mol% of Ni (LCN12)-modified Ni/ YSZ anode showed excellent long-term stability under H 2 and CH 4 conditions.

A review on the preparation of anode materials and anode films for solid oxide fuel cell applications

“…122 Ni-doped lanthanum cobalt oxide (LaCo 1-x Ni x O 3-δ ) synthesized through Pechini method and coated on a Ni-YSZ anode showed excellent phase stability during SOFC operation and good electrical conductivity. 123 An SBMO anode material synthesized using the sol-gel method demonstrated an improvement when a moderate carbon deposition with good conductivity and catalytic activity was applied. 119 In addition, a (La 0.3 Sr 0.7 ) 0.93 TiO 3 anode synthesized through the Pechini method displayed higher porosity and surface area with lower resistance compared with that prepared through the SSR approach.…”