Superior electric storage in de-alloyed and anodic oxidized Ti-Ni-Si glassy alloy ribbons.

Ti-Ni-Si glassy alloy supercapacitors, devices that store electric charge on their TiO₂ surfaces that contain many nanometer-sized cavities, display many advantages over other power-source technologies. The use of de-alloying and anodic oxidization methods has made possible the synthesis of a TiO₂ surface accessible to electron trapping. Until recently, no studies have addressed the 'dry' electric storage in light glassy alloys. Our device realizes AC electric storage from 193 to 453 K with a voltage variation from 10 to 150 V, and DC capacitance of ∼4.8 F (∼52.8 kF/cm³), on the basis of electric double layers, deep electronic trapping sites and Shottky barriers. Further gains could be attained with surface optimization. [ABSTRACT FROM AUTHOR]