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 189 conductivity increased to 12 S/cm in 10-22.5 atm O2 and decreased to 4 S/cm in 10-17.5 atm O2, with an apparent linear log slope. Figure 6-7. Electrical conductivity measurements of the air-sintered Sr2MgMoO6 sample SMM_1. Clearly, the conductivity is a function of the pO2 during measurement and during sintering. The SMM_2 values are in agreement with those measured in the original study by Huang et al which synthesized the material via a reducing-sinter [21]. Thus it seems that the minor impurities phases present in the reducing-sintered sample were not detrimental to the conductivity. As mentioned earlier, many of these impurity phases will become reduced to more electron-conductive phases in situ. Also, impurity phases like Sr3MoO6 were found in a prior study of the related material SFM, present as islands that that did not affect the bulk material properties [86]. The widely varying conductivity values reported in literature for SMM can most likely be explained by the extent of reduction. The reported conductivity of air-sintered samples at 800 °C ranges from 0.3 S/cm in 5% H2/Ar [87], 1.6 S/cm in 10-17 atm O2 [78], and 8.6 S/cm in 5% H2/Ar [88]. These are all lower than the value reached after 600 h in the present study, except for the 8.6 S/cm measurement. However, that study reported that their sample had a significant amount of SrMoO4 impurity. As discussed above, SrMoO4 will reduce to SrMoO3 in reducing atmosphere, during the test, which could enhance the conductivity since SrMoO3 has such high

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