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A potential electrolyte (Ce1-x CaxO2-delta) for fuel cells:Theoretical andexperimental study
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. COMSATS Inst Informat Technol, Dept Phys, Lahore 54000, Pakistan.;Univ Okara, Dept Phys, Okara 56300, Pakistan.
COMSATS Inst Informat Technol, Dept Phys, Lahore 54000, Pakistan.;Royal Inst Technol KTH, Dept Energy Technol, S-10044 Stockholm, Sweden..
Bahauddin Zakariya Univ, Dept Phys, Multan 60800, Pakistan..
COMSATS Inst Informat Technol, Dept Phys, Lahore 54000, Pakistan..
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2018 (English)In: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 44, no 11, p. 12676-12683Article in journal (Refereed) Published
Abstract [en]

First-principles calculations are performed using density function theory to explore the effects of dopant Ca in ceria (Ce1-x CaxO2-delta). The impact of oxygen vacancy on band gap and density of states is examined in doped ceria using generalized gradient approximations. Vacancy association and vacancy formation energies of the doped ceria are calculated to reveal the effect of dopant on ion conduction. The experimental study of the sample Ce0.875Ca0.125O2-delta) was performed to compare with the theoretical results. The obtained results from theoretical calculation and experimental techniques show that oxygen vacancy increases the volume, lattice constant (5.47315 angstrom) but decrease the band gap (1.72 eV) and bulk modulus. The dopant radius (1.173 angstrom) and lattice constant (5.4718 angstrom) are also calculated by equations which is close to the DFT lattice parameter. The result shows that oxygen vacancy shifts the density of states to lower energy region. Band gap is decreased due to shifting of valence states to conduction band. Vacancy formation shows a significance increase in density of states near the Fermi level. Density of states at Fermi level is proportional to the conductivity, so an increase in density of states near the Fermi level increases the conductivity. The experimental measured ionic conductivity is found to 0.095 S cm(-1) at 600 degrees C. The microstructural studies is also reported in this work.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2018. Vol. 44, no 11, p. 12676-12683
Keywords [en]
Fermi level, Band gap, Vacancy formation energy, Density of states, Association energy
National Category
Ceramics
Identifiers
URN: urn:nbn:se:kth:diva-232384DOI: 10.1016/j.ceramint.2018.04.068ISI: 000436351700098Scopus ID: 2-s2.0-85047612214OAI: oai:DiVA.org:kth-232384DiVA, id: diva2:1235801
Note

QC 20180727

Available from: 2018-07-27 Created: 2018-07-27 Last updated: 2022-06-26Bibliographically approved

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Belova, Lyubov

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