Monodisperse polyhedral nanoparticles (NPs) and nanorods (NRs) of cerium dioxide, CeO 2 , were synthesized by thermal decomposition of ammonium cerium(IV) nitrate, (NH 4 ) 2 Ce(NO 3 ) 6 , at 180 °C in an organic solution of oleylamine (OAm) and/or oleic acid (OA). The 4 nm CeO 2 NPs were synthesized in diphenyl ether solution of OAm and OA with the molar ratio of Ce/OAm/OA = 1:3:3, while the 6 nm CeO 2 NPs were made in 1-octadecene solution of OAm with Ce/OAm = 1:6. The NRs were formed in 1-octadecene with Ce/OAm/OA = 1:3:1.5. The CeO 2 NPs were assembled on γ-Al 2 O 3 via polyvinylpyrrolidone and were annealed at 500 °C under air to remove organic coating. They were well-dispersed on Al 2 O 3 and showed the increased oxygen storage capacity compared to the physical mixture of aggregated CeO 2 and γ-Al 2 O 3 powder. The reported CeO 2 NPs are promising for oxygen storage and release applications.

A Ca-bridged siloxene resulting from the deintercalation of Ca from CaSi2was synthesized, which shows stable Li storage performance.

Various lithium-ion garnet-like oxides, Li 7+X-Y (La 3−X A X )(Zr 2−Y Nb Y )O 12 , (where A is an alkali earth metal) were prepared by solid-state reaction, and their lithium-ion conductivities and lattice parameters were determined by AC impedance and X-ray diffraction analysis. The La and Zr sites in these materials were simultaneously substituted, and the extent of substitution was varied to optimize both lattice parameter and lithium content associated with the highest possible lithium-ion conductivity. The optimum lattice parameter at a constant lithium content was determined to be between 12.94 and 12.96 Å. Within this range of lattice parameters, higher lithium-ion conductivities were associated with reduced lithium content.