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Materiały dla jednowarstwowych ogniw paliwowych

Winiarz P.

Technical Issues

2016

nr 4

104--109

A composite material, which may be further applied as a single layer fuel cell, was synthesized using solid state synthesis method. Composite consisted of two components. The first was a nanoceramic proton conductor – calcium doped lanthanum niobate. The second one was a nanoceramic semiconductor oxide composed of lithium, nickel and zinc oxides respectively. Structural and electrical investigations were performed on the received material. Scanning electron microscope images showed that the microstructure on the surface of this material is homogeneous. Energy dispersive X-Ray diffraction confirms that the components of the investigated composite are mixed together in a volume of material allowing to current flow through the percolation threshold. Open circuit voltage was changing during measurement from 0.8V to 0.6V. Moreover, the material did not change its structural properties during the current flow, hence it could be a good candidate to the production of single layer fuel cells.

Influence of pore formers on electrical properties of Perovskite-type ceramics

Lendze T., Mielewczyk-Gryń A., Gdula-Kasica K., Kusz B., Gazda M.

Advances in Materials Science

2011

Vol. 11, nr 1(27)

55-63

Porous CaTi0.9Fe0.1O3-delta (CTF) perovskites were synthesized by the standard solid state method at different sintering temperatures with carbon black (CB), corn starch (CS) and potato starch (PS) as pore-forming agents. The ceramic samples of porosity between 9% and 42% with 5 - 40 mikrom pore sizes, were obtained by a 6 h sintering at either 1130o C or 1200o C of precursor powder prepared at 1470o C. X-ray diffraction analysis proved the existence of orthorhombic single-phase perovskites crystalline structure. Electrical conductivity at 800�‹ C was between 1.42 �~10.2 S cm.1 and 1.86�~10.3 Scm.1 . The conductivity markedly depended on the sample porosity. It should be noted that 30% of porosity, resulted in reduction of conductivity by less than one order of magnitude. Activation energy of conductivity varied between 0.41 and 0.56 eV. Cornstarch has been chosen as the most suitable pore-forming agent for obtaining the cathode of good properties. The best amount of the cornstarch has been proposed as between 5 and 10%.