Synthesis of CeAlO3/CeO2–Al2O3 for use as a solid oxide fuel cell functional anode material

Materiais Avançados para Aplicações Especiais

“…The synthesis procedures were designed to produce nanometric sized powders for which the calcination conditions were selected in order to fulfill requirements such as ease to be sintered; formation of selected phases upon calcinations at different temperatures; particle size control; surface area and morphology well suited for the production of ceramic suspensions to be processed into an SOFC functional anode. The main results have shown that [4] calcination under an oxidizing atmosphere induces the CeAlO3 phase with a tetragonal perovskite type structure to undergo a phase transformation to CeO2, with cubic fluorite type structure, and Al2O3. However, the structure is able to be reversed and reduced back to the CeAlO3 phase if calcined under a hydrogen atmosphere.…”

“…The main results have shown that [4] calcination under an oxidizing atmosphere induces the CeAlO3 phase with a tetragonal perovskite type structure to undergo a phase transformation to CeO2, with cubic fluorite type structure, and Al2O3. However, the structure is able to be reversed and reduced back to the CeAlO3 phase if calcined under a hydrogen atmosphere.As a result, the controlled synthesis of the new advanced ceramic material [3,4] and its incorporation into a ceramic suspension that allows the fabrication of the functional anode was successfully used in the special application that involves the direct utilization of ethanol as fuel in an SOFC with adequate performance [1]. This was possible because the anode microstructure was not seriously affected by the direct use of ethanol, showing good stability and resistance to coking, carbon clogging and cracking.…”

“…As a result, the controlled synthesis of the new advanced ceramic material [3,4] and its incorporation into a ceramic suspension that allows the fabrication of the functional anode was successfully used in the special application that involves the direct utilization of ethanol as fuel in an SOFC with adequate performance [1]. This was possible because the anode microstructure was not seriously affected by the direct use of ethanol, showing good stability and resistance to coking, carbon clogging and cracking.…”

“…Also, an innovation was created in this area in 2009 [3] and subsequently unveiled in the scientific literature [1,4], by using the CeAlO3 phase as new material for SOFC anode. The development of such a new material for SOFC anodes made the operation of the fuel cell possible at 950 o C during 200 h with the direct utilization of ethanol with no significant performance loss or carbon deposition that would inactivate the device, as depicted in Figure 2.…”

Síntese de Eletrocatalisadores Cerâmicos Nanométricos

“…Table 1 presents such results for cerium aluminate, used as SOFC anode with the direct utilization of ethanol [7], aiming to efficiently produce electricity without carbon coking. Figure 1 presents total conductivity values for multifunctional anode composed of lanthanum aluminate that is able to promote the direct oxidation of methane and its electrochemical conversion into C2-type hydrocarbons [8].…”