@article {48431, title = {Synthesis and ionic conductivity of calcium-doped ceria relevant to solid oxide fuel cell applications}, journal = {Materials Advances}, volume = {3}, year = {2022}, month = {OCT}, pages = {8780-8791}, type = {Article}, abstract = {

Towards the development of green energy devices, it is necessary to focus on commercial electrolyte materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). Ca-doped ceria (CDC) samples having a composition of Ce(1-x)CaxO2-δ\ (0.03 <=\ x\ <= 0.1) were synthesized by a facile solid-state route and sintered at a lower temperature (1473 K). X-ray diffraction, Raman, X-ray photoelectron, Fourier-transform infrared, UV{\textendash}VIS diffuse reflectance, field emission scanning electron microscopy {\textendash} energy dispersive X-ray with elemental mapping, and electrochemical impedance spectroscopy techniques were used for the characterization of these CDC samples. The 0.10 CDC showed high oxide ion conductivity of 8.01 {\texttimes} 10-3\ S cm-1\ at 973 K with a lower activation energy of 0.78 eV. The 0.03 CDC, 0.05 CDC, and 0.07 CDC samples exhibited ionic conductivities of 1.66 {\texttimes} 10-4, 4.42 {\texttimes} 10-3, and 5.76 {\texttimes} 10-3\ S cm-1\ at 973 K with activation energies of 1.65, 1.01, and 0.92 eV, respectively. The present work aims to develop Ca-doped ceria as economically viable electrolytes for IT-SOFCs.

}, doi = {10.1039/D2MA00868H}, author = {Momin, Naeemakhtar and Manjanna, J. and Kobayashi, Satoru and Aruna, S. T. and Kumar, S. Senthil and Nayaka, G. P.} }