Volume 128, Number 5, December 2019
|Number of page(s)||5|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||04 February 2020|
Amorphous titanium-oxide supercapacitors with high capacitance
1 New Industry Creation Hatchery Center, Tohoku University - Sendai 980-8579, Japan
2 Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University Sendai 980-8579, Japan
3 The Electron Microscopy Center, Tohoku University - Aoba, Sendai 980-8577, Japan
Received: 9 May 2019
Accepted: 19 December 2019
An amorphous titanium-oxide film oxidized anodically on amorphous Ti–10at%V–15at%Si alloy ribbons demonstrated excellent electric properties. Specifically, it showed a remarkable increase in parallel capacitance Cp, series capacitance Cs, time constant RCs, and decrease in the dielectric loss with decreasing frequency. The oblate semicircle after a semicircle with a Warburg region in the Nyquist diagram and rapid increases in the real impedance in the low-frequency region in the Bode diagram demonstrated a parallel circuit comprising an electric transport resistance Re (0.64 MΩ), and a high electric double-layer capacitance Cdl (604.0 μF/cm 2) at a nanometer-sized ( in convex size) uneven surface between an upper (Ti0.84V0.11Si0.05)O1.655 layer approximately 45-nm deep and air. The superior capacitances could be elucidated by electrostatic induction of a large positive charge to the uneven oxide surface based on the electronic conduction state derived from TiO2/VO2 nanostructural interfaces in the upper oxide layer.
PACS: 84.32.Tt – Capacitors / 78.55.Qr – Amorphous materials; glasses and other disordered solids / 61.46.-w – Structure of nanoscale materials
© EPLA, 2020
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