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Chapter 6. Molybdate Based Ceramic Electrode Materials 191 Figure 6-9. Electrical conductivity measurements made on 3 different SNM samples, with the differences described in the text. The conductivity measurements for three air-sintered double perovskite Sr2NiMoO6 (SNM) samples are shown in Figure 6-9. SNM_1 was sintered in air and tested in 1.3%H2O/9%H2/90%N2 (cold-humidified), which had a pO2 of 10-20 atm at 800 °C. The conductivity reached about 0.3 S/cm at 800 °C and was slightly enhanced at temperatures above 800 °C, evident from the vertical regions during which conductivity increased at a fixed temperature (Figure 6-9a). SNM_2 was also sintered in air but tested in a more reducing atmosphere, dry 9% H2/N2 (pO2=10-26 atm at 750 °C). Its conductivity reached 45 S/cm at 750 °C and seemed to continually increase during the test (Figure 6-9b). SNM_3 was pre-reduced before measurement at 800 °C in dry 9% H2/Ar for 24 h, and tested in dry 9% H2/N2. Unlike the others, the measurements show that this sample began the test with metallic conductivity (Figure 6-9c). Upon reaching 800 °C and holding this temperature, the conductivity began to increase with time. Upon reducing the temperature to 600 °C, the conductivity was stable. The temperature was again increased to 800 °C and the conductivity continually increased, reaching about 70 S/cm. At this point, the pO2 variation was carried out (Figure 6-9d) and at a slightly different pO2 the conductivity increased further, to >100 S/cm. However, at a pO2 higher than 10-19-10-18, the conductivity dropped sharply to about 0.4 S/cm – about the same as thatPDF Image | Electrolysis of CO2 and H2O
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