  With a large-scale usage of portable electric appliances, a high demand for
increasingly high density energy storage devices has emerged. MoO3 has, in
principle, a large potential as negative electrode material in supercapacitive
devices, due to high charge densities that can be obtained from its reversible
redox reactions. Nevertheless, the extremely poor electrochemical stability of
MoO3 in aqueous electrolytes prevents a practical use in high capacitance
devices. In this work, we describe how to overcome this severe stability issue
by forming amorphous molybdenum oxide/tantalum oxide nanotubes by anodic
oxidation of a Mo-Ta alloy. The presence of a critical amount of Ta-oxide (> 20
at-%) prevents the electrochemical decay of the MoO3 phase and thus yields an
extremely high stability. Due to the protection provided by tantalum oxide, no
capacitance losses are measureable after 10000 charg-ing/discharging cycles.
