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Chapter 6. Molybdate Based Ceramic Electrode Materials 172 6. Molybdate Based Ceramic Electrode Materials Ceramic materials offer a number of potential advantages over metals for solid oxide cell electrode applications. Developing a high performance ceramic electrode could significantly improve the economics of electrolysis. This chapteri presents a study of fundamental properties of a number of molybdate ceramic materials which might be useful as components of negative-electrodes in solid oxide cells, as alternatives to the common Ni-YSZ electrode studied in previous chapters. The molybdate family is relatively unexplored for solid oxide cell applications. A few of the materials examined in the present study had been studied as fuel cell anodes in prior work and others are new materials from related families that have not been tested as solid oxide cell electrodes. None of the materials, including those that have been studied as fuel cell anodes, have been tested for electrolysis. The composition of the materials was systematically varied within the molybdate family. Other elements, based on their ionic radii and properties of potential stability and electrochemical activity, were introduced alongside Mo on the B-site of the ceramic crystals. The electrical conductivity, phase (and phase stability in different atmospheres) and microstructure of the materials was investigated. These properties could be linked to the composition – the stability could be mostly explained by thermodynamic data of the constituent oxides and the conductivity was related to the valence states of the ions and the defect chemistry of the ceramic crystals. The conductivity of all the materials depended significantly on the thermal history. The electrochemical activity for reduction of H2O and CO2 and oxidation of H2 and CO was investigated using simplified geometry point-contact electrodes similar to those used to study the metals in Chapter 5. Several of the materials studied in this work were found to have i Part of this chapter has been published in modified form as: Graves C, Sudireddy B R, and Mogensen M, Molybdate Based Ceramic Negative-electrode Materials for Solid Oxide Cells. ECS Transactions, 2010. Vol. 28. In press. Chapter 6PDF Image | Electrolysis of CO2 and H2O
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