A highly scalable spray coating technique for electrode infiltration: Barium carbonate infiltrated La0.6Sr0.4Co0.2Fe0.8O3-δ perovskite structured electrocatalyst with demonstrated long term durability. (28th September 2017)

• Record Type: Journal Article
• Authors: Hong, Tao; Lee, Shiwoo; Ohodnicki, Paul; Brinkman, Kyle
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 39(2017)
• Page Start: 24978
• Page End: 24988
• Publication Date: 2017-09-28
• Subjects: Spray coating -- Oxygen reduction reaction -- Barium carbonate -- Cathode reaction -- Solid oxide fuel cells; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.08.091
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: This work demonstrated a highly scalable spray coating process for cathode infiltration with excellent long-term stability for the oxygen reduction reaction. Barium carbonate (BaCO3 ) nanoparticles have previously demonstrated excellent catalytic activity for the oxygen reduction reaction and were chosen as a model system to be applied by spray coating onto La0.6 Sr0.4 Co0.2 Fe0.8 O3-δ (LSCF) and LSCF-SDC (Sm0.2 Ce0.8 O2-δ ) cathode materials. In this work, barium acetate solutions were modified by a surfactant to lower the surface tension and decrease the contact angle on LSCF which is a benefit for the infiltration process. In the LSCF electrode, BaCO3 nano-particles exhibited significant interfacial contact with LSCF particles by the spray coating technique. As a result, the polarization resistance of BaCO3 infiltrated LSCF was reduced from 2.5 to 1.2 Ωcm 2 at 700 °C. In addition, commercial full cell SOFCs with BaCO3 infiltrated LSCF-SDC cathodes also demonstrated higher performance due to the reduced cathode resistance. At 750 °C, the electrode overpotential of the BaCO3 infiltrated cell was much lower than that of baseline cell during long term testing (500 h). The polarization resistance of the BaCO3 infiltrated LSCF-SDC electrode only increased by 1.6% after 500 h. Highlights: Demonstrated highly scalable spray coating technique for infiltration. Surfactant modified solutions showed lower surface tension and contact angle. Polarization resistance was reduced from 2.5 to 1.2 Ωcm 2 at 700 °C. Polarization resistance of full cell only increased by 1.6% after 500 h.