Electrophoretic Deposition of Dense La_0.8Sr_0.2Ga_0.8Mg_0.115Co_0.085O_3−δ Electrolyte Films from Single‐Phase Powders for Intermediate Temperature Solid Oxide Fuel Cells

Abstract

La 0.8 Sr 0.2 Ga 0.8 Mg 0.115 Co 0.085 O 3Àd (LSGMC) powders were prepared by polymeric precursor synthesis, using either polyvinyl alcohol (PVA) or citric acid (CA) as complexing agents. The powders were synthesized using different ratios between the complexing agent and the cations dissolved in solution. The obtained polymer gel precursors were dried and calcined at temperatures between 10001 and 14501C. Single-phase LSGMC powders were obtained at a firing temperature of 14501C, using PVA and a molar ratio between the hydroxylic groups and the total cations of 3:1. Phase-pure LSGMC powders were used to sinter (14901C, 2 h) thick pellets. The functional properties of LSGMC pellets were assessed by electrochemical impedance spectroscopy. The electrical conductivity values and the apparent activation energies in different transport regimes were in agreement with literature data. The same LSGMC powders were deposited by electrophoretic deposition (EPD) on a green membrane containing lanthanum-doped ceria (La 0.4 Ce 0.6 O 2Àx , LDC), a binder, and carbon powders. The LSGMC/LDC bilayer obtained by EPD was cofired at 14901C for 2 h. A dense and crack-free 8-lm-thick LSGMC film supported on a porous skeleton of LDC was obtained. The combined use of proper powder synthesis and film processing routes has thus proven to be a viable way for manufacturing anode-supported LSGMC films.

Anode Supported Protonic Solid Oxide Fuel Cells Fabricated Using Electrophoretic Deposition

“…A maximum power density of 296 mW cm -2 was deposition time, use of simple equipment, low cost and suitability for mass production. EPD has also been used in SOFC technology for deposition of oxygen ion conductor electrolyte thick films on anode or cathode porous substrates [22][23][24][25][26][27][28]. To the best of our knowledge, apart from our preliminary study [29], EPD was never used for the deposition of proton conductor electrolyte thick films.…”

“…Typical green or pre-sintered NiO-YSZ substrates for anodesupported SOFCs are not conductive at room temperature. Nevertheless, it is possible to achieve a green anode conductivity value adequate for EPD deposition optimising their microstructure and porosity [30] or adding graphite that acts both as pore former and electronic conductor [27,28,32,33].…”

LaCo0.6Ni0.4O3−δ as cathode contact material for intermediate temperature solid oxide fuel cells

“…This method is also called as steric entrapment synthesis [29,30]. PVA with a polymerization degree of 1700 (Sinopharm Chemical Reagent Co, Ltd.) was dissolved in distilled water at 95 C to formulate a 5 wt% PVA solution, to which La(…”

Phase Transition Domains in Ca‐based Complex Perovskite Dielectric Ceramics

“…Perovskite ceramics are widely used in many application fields, such as, dielectric ceramics, solid oxide fuel cells (SOFC), catalyst, magnetic, superconductive, and colossal magnetroresistance materials because of their variable and chemically tunable properties they exhibit . Each of these properties is strongly influenced by the structure and microstructure, as subtle changes will alter symmetry considerations, bond overlap, and band energy levels .…”

“…Introduction P EROVSKITE ceramics are widely used in many application fields, such as, dielectric ceramics, solid oxide fuel cells (SOFC), catalyst, magnetic, superconductive, and colossal magnetroresistance materials because of their variable and chemically tunable properties they exhibit. [1][2][3][4][5][6][7][8][9][10] Each of these properties is strongly influenced by the structure and microstructure, as subtle changes will alter symmetry considerations, bond overlap, and band energy levels. [11][12][13] Understanding and predicting the structure and microstructure of these ceramics are essential for the intelligent design of new and useful materials.…”