Amorphous alumina supercapacitors with voltage-charging performance. (1st February 2023)

• Record Type: Journal Article
• Authors: Fukuhara, Mikio; Yokotsuka, Tomonori; Hashida, Toshiyuki; Yamaguchi, Koji; Fujima, Nobuhisa
• Is Part Of: Europhysics letters. Volume 141:Number 3(2023)
• Publication Date: 2023-02-01
• Subjects: Physics -- Periodicals; Electronic journals; 530.05
• DOI: 10.1209/0295-5075/acb2f5
• Languages: English
• ISSNs: 0295-5075

Abstract

Abstract: The electric storage effect of fast charging by voltage application for amorphous alumina (cAAO) supercapacitors fabricated using a crystalline aluminum alloy was investigated in terms of charging/discharging behaviors and AC impedance. The mechanism for the electrical storage of a cAAO supercapacitor was proposed based on the coupling of electrons on Al atoms and positively charged holes in Al vacancies, using an electric double-layer model containing an electrolyte with an electrical resistivity of 6.3 × 10 5 Ωcm. The supercapacitor demonstrated fast charging at a voltage application of up to 500 V.