Electrodes of rationally designed composite nanostructures can o®er many opportunities for the enhanced performance in electrochemical energy storage. This paper attempts to illustrate the design and production of NiMoO 4 /polypyrrole core-shell nanostructures on nickel foam to be used in supercapacitor via a facile hydrothermal and electrodeposition process. It has been veri¯ed that this novel nanoscale morphology has outstanding capacitive performances. While employed as electrodes in supercapacitors, the composite nanostructures showed remarkable electrochemical performances with a great areal capacitance (3.2 F/cm 2 at a current density of 5 mA/cm 2 ), and a signi¯cant cycle stability (80% capacitance retention after 1000 cycles). The above results reveal that the composite nanostructures may be a likely electrode material for high-performance electrochemical capacitors.

Pr 60 Ni 25 Al 15 bulk metallic glass in a cuboid form with dimensions of 2 mm × 2 mm × 55 mm by copper mold casting method was cast. The dynamic viscosity near the glass transition region for Pr 60 Ni 25 Al 15 was measured by three-point beam bending methods. The fragility parameter m and activation energy for viscous flow of the liquid sample were calculated to be: m = 31.66, E = 10689.17 K, respectively. It was shown that the supercooled liquid of Pr 60 Ni 25 Al 15 alloy behaved much closer to strong glasses. The variation of active energy with temperature in supercooled liquid was analyzed. It was found that Kivelson's super-Arrhenius equation is not suitable for description of the activation energy in a supercooled region of Bulk metallic glass, and there is a direct proportion between activation energy crystallization and activation energy of viscous flow. bulk metallic glass, viscosity, fragility, activation energy for viscous flow, activation energy of crystallization