Electrical properties of hollandite-type Ba1.33Ga2.67Ti5.33O16, K1.33Ga1.33Ti6.67O16, and K1.54Mg0.77Ti7.23O16

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dc.contributor.authorCao, Cen_AU
dc.contributor.authorSingh, Ken_AU
dc.contributor.authorKan, WHen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorThangadurai, Ven_AU
dc.date.accessioned2021-06-28T23:43:33Zen_AU
dc.date.available2021-06-28T23:43:33Zen_AU
dc.date.issued2019-03-28en_AU
dc.date.statistics2021-06-24en_AU
dc.description.abstractElectrical conductivity and electrochemical catalytic activity for H2 oxidation of Ti-based hollandite-type Ba1.33Ga2.67Ti5.33O16 (BGT), K1.33Ga1.33Ti6.67O16 (KGT), and K1.54Mg0.77Ti7.23O16 (KMT) were investigated, along with the chemical stability of KMT under H2 at elevated temperature. BGT, KGT, and KMT crystallized in a tetragonal structure with the space-group I4/m. The electrical conductivity in H2 increases with increasing Ti content, and the highest total electrical conductivity of 2 S/cm at 800 °C in H2 was observed for KMT. KGT:Fe (1:1) + 20% LSGM + 30% porosity composite electrode showed the lowest area specific resistance of ca. 1.6 Ω cm2 at 800 °C for hydrogen oxidation reaction (HOR) under the open circuit condition. Moderate catalytic activity for HOR could be attributed to poor oxide ion conductivity and exclusion of potassium and hydrogen uptake in H2 at elevated temperature. Bond valence sum mismatch map calculation showed that the ionic transport happens along the 1D channel of c-axis in the hollandite oxides. © 2019 American Chemical Societyen_AU
dc.identifier.citationCao, C., Singh, K., Kan, W. H., Avdeev, M., & Thangadurai, V. (2019). Electrical properties of hollandite-type Ba1.33Ga2.67Ti5.33O16, K1.33Ga1.33Ti6.67O16, and K1.54Mg0.77Ti7.23O16. Inorganic chemistry, 58(8), 4782-4791. doi:10.1021/acs.inorgchem.8b03152en_AU
dc.identifier.issn1520-510Xen_AU
dc.identifier.issue8en_AU
dc.identifier.journaltitleInorganic chemistryen_AU
dc.identifier.pagination4782-4791en_AU
dc.identifier.urihttps://doi.org/10.1021/acs.inorgchem.8b03152en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10935en_AU
dc.identifier.volume58en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectAtmospheric chemistryen_AU
dc.subjectPorosityen_AU
dc.subjectElectrodesen_AU
dc.subjectElectrical propertiesen_AU
dc.subjectElectric conductivityen_AU
dc.subjectElectrochemistryen_AU
dc.titleElectrical properties of hollandite-type Ba1.33Ga2.67Ti5.33O16, K1.33Ga1.33Ti6.67O16, and K1.54Mg0.77Ti7.23O16en_AU
dc.typeJournal Articleen_AU
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