Abstract
La4-xSrxNi3O10±δ (x = 0, 0.05, 0.1, 0.2, 0.3, 0.5 and 1) compositions synthesized via citrate gel method have been investigated as a candidate cathode for intermediate temperature SOFC. The n = 3 RP single phase of La4-xSrxNi3O10±δ (x = 0, 0.05, 0.1 and 0.2) can be achieved after calcined at 1000°C for 4 hrs in air. The further addition of Sr with x 0.3 leads to obtain La2-xSrxNiO4±δ and NiO as the second phase. La4Ni3O10±δ based material shows the highest electrical conductivity with a value of 124 S/cm at room temperature. With Sr dopant, both of transition temperature and the electrical conductivity of La4Ni3O10±δ decrease and further decrease with increasing the amount of Sr. The electrical conductivity at 250°C of La4-xSrxNi3O10±δ (x = 0, 0.05 and 0.1) is 100, 94 and 75 S/cm respectively. For x = 0.3, 0.5 and 1, it reduces to the values of 28, 7 and 4 S/cm, respectively because of the lower conductivity phase of La2-xSrxNiO4±δ.
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