Synthesis and characterization of molten carbonate fuel cell solid electrolyte materials

H2 as one of the alternative energy sources and fuel cells supplying this energy will be most common and important energy production processes. Running out of fossil energy sources and environmental pollution are the most important reasons of this fact.As a first stage in this thesis, electrolytic matrices of EKYH systems and synthesis conditions of LiAlO2 material of matrix have been researched particularly. Synthesis operations are executed by using three different kinds of lithium compounds (LiOH, LiNO3 and Li2O3) and two different kinds of aluminum compounds (Al2O3, Al(OH)3). The synthesis conditions for all reactions done in four different pH levels (1,5, 4,5, 9,5 and 12) and has been calcinated at three different calcination temperatures in the air.At the second stage of the thesis, mud were prepared at proper amount of organic compounds of synthesized LiAlO2 samples by using sol-gel technique and synthesizes of matrix samples were synthesized by using tape-casting technique. In addition, a matrix study has been realized with eutectic mixture of Li2CO3-K2CO3-LiAlO2 compounds and thickness of this raw strip were measured as 0.4 mm after drying process. This mixtures? surface area was obtained as 57,24 m2/g.For surface area studies and experiences LiAlO2 examples were synthesized from different compounds, and three calcination temperatures (650, 800, 950oC) were chosen that was occured phase transformation. Consequently at the middle temperatures, the surface area was reduced (50-55m2/g). At the high temperatures it was increased (55-80m2/g) because of the changes its strucure.As a result of thermal, structural and surface area characterization experiments (TGA-DSC, XRD and BET analyses), it is concluded that LiAlO2 which is produced with Li2CO3 and Al(OH)3, was in alfa phase and calcinated at 650oC is convenient. The largest surface area was obtained in LiAlO2 compound that 163,89m2/g which is produced with Li2CO3 and Al(OH)3, was in alfa phase and calcinated at 650oC.