Superior electric storage in de‐alloyed and anodic oxidized Ti–Ni–Si glassy alloy ribbons

Abstract 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. magnified image (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)