The Electrochemical Properties of Nanocrystalline Gd 0.1 Ce 0.9 O 1.95 Infiltrated Solid Oxide Co-Electrolysis Cells

Abstract

© The Author(s) 2018. Ni-YSZ/YSZ/GDC/LSCF6428-GDC10 solid oxide cells were fabricated and investigated in high-temperature H2O/CO2co-electrolysis using various inlet fuel compositions at 800◦C. Furthermore, to see the effect of infiltration on co-electrolysis, the precursor solution for a 10% gadolinium-doped ceria (GDC10) catalyst was dispersed into a fuel electrode backbone by a controlled urea/cation infiltration method. The influence of the inlet gas composition on the syngas product ratio was investigated by in-line gas chromatography. To understand the high-temperature H2O/CO2co-electrolysis cell performance, electrochemical impedance spectroscopy (EIS) under open-circuit voltage and I-V characteristics, by the electrochemical reactions occurring at the electrodes of prepared solid oxide electrolysis cell (SOEC) were examined. When the inlet gas composition was N263.5%, H25%, CO211.5% and H2O 20% under electrolysis current density at −0.6 A cm−2, the H2/CO ratio of infiltrated cell was improved from 2.1 to 2.8 compared with the non-infiltrated cell. The thermodynamic factors determining the size, morphology and shape of the infiltrated particles were discussed.