Cathodic overpotentials of Ln 0.6 Sr 0.4 MnO 3 ( Ln = La , Pr , Nd , Sm , Gd , Yb , and Y ) were studied for a new cathode of solid oxide fuel cell (SOFC). Cathodic overpotentials as well as the electrical conductivity strongly depended on the rare earth cations used for the A sites of perovskite oxide. Strontium doped PrMnO 3 exhibited the highest electrical conductivity among the examined perovskite oxide containing Mn for B sites. Moreover, overpotentials of Sr‐doped PrMnO 3 cathode maintained low values in spite of decreasing the operating temperature. Consequently, almost the same power density of SOFC with La 0.6 Sr 0.4 MnO 3 cathode can be obtained at about 100 K lower operating temperature by using Sr‐doped PrMnO 3 as the cathode. The overpotentials and electrical conductivity decreased and increased with increasing the amount of Sr dopant in PrMnO 3 , respectively, and the lowest overpotential was attained at x = 0.4 in Pr 1 − x Sr x MnO 3 . Comparing with La 0.6 Sr 0.4 MnO 3 oxide, the reactivity of Pr 0.6 Sr 0.4 MnO 3 with Y 2 O 3 ‐ stabilized ZrO 2 is much less than that of La 0.6 Sr 0.4 MnO 3 and furthermore, the matching of thermal expansion of Pr 0.6 Sr 0.4 MnO 3 with Y 2 O 3 ‐ ZrO 2 was satisfactorily high. Therefore, perovskite oxide of Pr 0.6 Sr 0.4 MnO 3 has a great possibility of the cathode materials for decreasing the operating temperature of solid oxide fuel cells.
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Ishihara et al. (1995) studied this question.