• Marina, Olga A.
• Coyle, Christopher
• Meinhardt, Kerry
• Karki, Surendra B.
• Le, Long
• Seymour, Lorraine
• Escobar, Julian

Abstract

<jats:p>In this work, strontium-free copper-doped nickelates, La<jats:sub>2</jats:sub>Ni<jats:sub>1-x</jats:sub>Cu<jats:sub>x</jats:sub>O<jats:sub>4</jats:sub> (x=0.1-0.3), were synthesized using solid state synthesis method and tested as potential oxygen electrodes in solid oxide electrolysis cells (SOEC). Similar to the parent compound, the Ruddlesden-Popper (RP) La<jats:sub>2</jats:sub>NiO<jats:sub>4</jats:sub> oxide, the Cu-doped compositions were confirmed to crystallize with tetragonal crystal structure with <jats:italic>I</jats:italic>4/<jats:italic>mmm</jats:italic> space group. The electrochemical performance of La<jats:sub>2</jats:sub>Ni<jats:sub>1-x</jats:sub>Cu<jats:sub>x</jats:sub>O<jats:sub>4 </jats:sub>electrodes was studied using Ni-YSZ electrode-supported button cells in SOEC mode and compared to the state-of-the-art (La<jats:sub>0.6</jats:sub>Sr<jats:sub>0.4</jats:sub>)<jats:sub>0.95</jats:sub>Co<jats:sub>0.0.8</jats:sub>O<jats:sub>3-δ</jats:sub> (LSCF)-doped ceria composite electrodes. Electrochemical tests were conducted at 750<jats:sup>o</jats:sup>C with the Ni-YSZ hydrogen electrode exposed to 50% steam in hydrogen. The polarization resistance of SOEC with the La<jats:sub>2</jats:sub>Ni<jats:sub>0.8</jats:sub>Cu<jats:sub>0.2</jats:sub>O<jats:sub>4 </jats:sub>(LNCuO-20) electrode was lower than that with LSCF. LNCuO-20 showed stable current density output over 800 hours tested, while cell with LSCF showed more degradation.</jats:p>

Topics

• density
• compound
• Oxygen
• Strontium
• composite
• Hydrogen
• copper
• current density
• space group