Evaluation of Nd_0.8-x Sr_0.2Ca _x CoO_3-δ (x = 0, 0.05, 0.1, 0.15, 0.2) as a cathode material for intermediate-temperature solid oxide fuel cells.

ABSTRACT: A series of Nd_0.8-x Sr_0.2Ca _x CoO_3-δ (x = 0, 0.05, 0.1, 0.15, 0.2) cathode materials was synthesized by sol-gel method. The effect of Ca doping amount on the structure was examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermal expansion, and X-ray photoelectron spectroscopy (XPS). Electrochemical properties were evaluated for possible application in solid oxide fuel cell (SOFC) cathodes. Results showed that second phase NdCaCoO_4+δ is generated when the Ca doping amount is higher than 0.1. The increase in Ca limits the electronic compensation capacity of the material, resulting in a decrease in thermal expansion coefficient (TEC). With the increase of Ca content, the conductiv

SUBMITTER: Du X 

PROVIDER: S-EPMC9190786 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature