An investigation of different Nd sub(1.8)Ce sub(0.2)CuO sub(4+ delta )-Ce sub(0.9)Gd sub(0.1)O sub(2- delta ) composite cathodes

• Published in: Electrochimica acta Vol. 130; pp. 439 - 445
• Main Authors: Khandale, A P, Bhoga, S S
• Format: Journal Article
• Language: English
• Published: 01.06.2014
• Subjects: BALL MILLS; Cathodes; Cerium oxide; COATING; COMPOSITES; COPPER OXIDE; Crystallites; Dispersions; ELECTRICAL CONDUCTIVITY; Electrodes; Electrolytes; Resistivity; Spin coating
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2014.03.031

The compositions of (100-x)Nd sub(1.8)Ce sub(0.2)CuO sub(4+ delta ):(x)C e sub(0.9)Gd sub(0.1)O sub(2-) sub( delta ) (x = 00, 10, 20, 30, 40 and 50 vol.%) composite system, synthesized by ball milling appropriate mixture followed by sintering at 1000 degree C for 4 h, are of superfine crystalline nature (crystallite size 106 to 253 nm). The dc conductivity decreases with increase in Ce sub(0.9)Gd sub(0.1)O sub(2-) sub( delta ) second phase. The increase in Ce sub(0.9)Gd sub(0.1)O sub(2-) sub( delta ) content in composites reduces the crystallite size of Nd sub(1.8)Ce sub(0.2)CuO sub(4+ delta ). Symmetric cells in the configuration given by electrode/electrolyte/electrode with gadolinia-doped ceria (GDC) as electrolyte were fabricated by spin coating the ink of cathode. The minimum area specific resistance (ASR) value of 0.34 Omega cm super(2) was obtained at a temperature of 700 degree C, for (70)Nd sub(1.8)Ce sub(0.2)CuO sub(4+ delta ):(30)Ce sub(0.9)Gd sub(0.1)O sub(2-) sub(d) composite cathode, and directly correlated with optimum dispersion of gadolinia-doped ceria into Nd sub(1.8)Ce sub(0.2)CuO sub(4+ delta ) matrix.