Amorphous Mo-Ta Oxide Nanotubes for Long-Term Stable Mo Oxide-Based Supercapacitors.

With a large-scale usage of portable electric appliances, a high demand for increasingly high-density energy storage devices has emerged. MoO has, in principle, a large potential as a 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 MoO in aqueous electrolytes prevents a practical use in high capacitance devices.