Studies on the percolation limit of Ce0.9Gd0.1O1.95 in La0.6Sr0.4Co0.2Fe0.8O3−δ–Ce0.9Gd0.1O1.95 nanocomposites for solid oxide fuel cells application. (October 2015)

• Record Type: Journal Article
• Authors: Jamale, Atul P.; Jadhav, S.T.; Dubal, S.U.; Bhosale, C.H.; Jadhav, L.D.
• Is Part Of: Journal of physics and chemistry of solids. Volume 85(2015:Oct.)
• Page Start: 96
• Page End: 101
• Publication Date: 2015-10
• Subjects: Ceramics -- X-ray diffraction -- Electrical conductivity -- Microstructure; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2015.05.012
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: A large difference in thermal expansion coefficient of electrode and electrolyte leads to imperfect electrode/electrolyte interface and hence significant polarization losses in solid oxide fuel cells. To overcome the difficulties associated with electrode and electrode/electrolyte interface, there is need to fabricate the composite cathode. Thus the present paper deals with study of La0.6 Sr0.4 Co0.2 Fe0.8 O3− δ (LSCF)–Ce0.9 Gd0.1 O1.95 (GDC) nanocomposite with different fractions of GDC obtained by physical mixing of combustion synthesized nanopowders. No secondary phases were observed upon sintering at 1100 °C for 2 h affirming the chemical compatibility between LSCF and GDC. The composites with relatively high GDC% have higher density as a consequence of rapid grain growth and less conductivity. The nanocomposite with 50% of GDC showed electric conductivity of 30 Scm −1 at 500 °C and low area specific resistance of 106 Ω cm 2 with 10 μs relaxation time at 200 °C. Graphical abstract: Graphical representation of solid oxide fuel cell with scanning electron micrograph and electrochemical impedance spectra of LSCF–GDC nanocomposite cathode. Highlights: LSCF–GDC nanocomposites have been prepared at 1100 °C for 2 h. XRD pattern reveals chemical compatibility among LSCF and GDC upon sintering. Composite with 50% of GDC and 50% of LSCF possess conductivity of 30 Scm −1 . Density of L5G5 composite is moderate and provides number of sites for reactions. L5G5 has an area specific resistance of 106 Ω cm 2 with 10 μsec relaxation time.