Electrolysis of CO2 and H2O

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Electrolysis of CO2 and H2O ( electrolysis-co2-and-h2o )

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Chapter 6. Molybdate Based Ceramic Electrode Materials 187 This could be the results of either some long-range ordering on the B-site, e.g. a pseudo-double perovskite with a new type of Ni2+/Ti4+/Mo6+ ordering, or the material might just be a composite of the two phases. Further crystallographic and microstructural studies are needed to determine if it is single-phase or a composite. Finally, the XRD data showing the reduction of La2Mo2O9 to amorphous LaMoO is presented in Figure 6-5c and compares well with that presented in the prior work [24]. Figure 6-5. X-ray diffractograms of some of the synthesized materials. 6.3.2. Electrical Conductivity The electrical conductivity was measured versus temperature and pO2. The measurements for the 100% B-site Mo (SM and LM) and solid solutions (STM and SVM) are shown in Figure 6-6. SM clearly has extremely high conductivity (Figure 6-6a), near 104 S/cm at room temperature, which is consistent with literature [31, 32, 64, 79-81]. Its conductivity had not previously been reported for this high temperature range and pO2. At 800 °C the conductivity was just under 2000 S/cm and the pO2 was 10-22 atm. However, when increasing the pO2 only slightly, to 10-20 atm, the conductivity decreased to <0.01 S/cm. The material oxidized and became the insulating SrMoO4 phase, at least on the surface where the voltage probes made contact. This is roughly consistent with the reported narrow pO2 window for stability of SM at the higher temperature of 1200 °C [63]. SVM (Figure 6-6b) and STM (Figure 6-6e) also exhibited very high conductivity, around 400 S/cm at 800 °C in 10-20 atm O2. Similar values have been reported in literature for

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