Kevin Ray Heier

Ordered Mesoporous Metallic MoO2 Materials with Highly Reversible Lithium Storage Capacity

Highly ordered mesoporous crystalline MoO(2) materials with bicontinuous Ia3d mesostructure were synthesized by using phosphomolybdic acid as a precursor and mesoporous silica KIT-6 as a hard template in a 10% H(2) atmosphere via nanocasting strategy. The prepared mesoporous MoO(2) material shows a typical metallic conductivity with a low resistivity ( approximately 0.01Omega cm at 300 K), which makes it different from all previously reported mesoporous metal oxides materials. Primary test found that mesoporous MoO(2) material exhibits a reversible electrochemical lithium storage capacity as high as 750 mA h g(-1) at C/20 after 30 cycles, rendering it as a promising anode material for lithium ion batteries.

VO2(B) nanorods: solvothermal preparation, electrical properties, and conversion to rutile VO2 and V2O3

The solvothermal reduction of V2O5 by formaldehyde or isopropanol yields nanorods of the metastable, monoclinic VO2(B) phase. The structural transition in VO2(B), which occurs near room temperature, has been monitored using electrical resistivity measurements, performed both on pressed pellets of the nanorods as well as on nanorods dispersed on patterned contacts. A sudden, 105 increase in the electrical resistivity upon cooling below 290 K is seen in measurements on VO2(B) samples. Such a transition in the electrical resistivity has not previously been reported in this material. The transition is reminiscent of the metal-to-insulator transition observed in the case of pressed pellets of polycrystalline rutile VO2 upon cooling below 340 K. The metastable VO2(B) nanorods are converted to rutile VO2 by heating in argon, and to corundum V2O3 by reducing in 5%H2:95%N2. In both transformations, the structural integrity of the nanorods is compromised, with large, dense, rutile VO2 crystallites and less well-defined nanorods of V2O3 being formed.