Amorphous aluminum-oxide supercapacitors Mikio Fukuhara, Tomoyuki Kuroda, Fumihiko Hasegawa, Toshiyuki Hashida, Eunsang Kwon and Kazuya Konno EPL, 123 5 (2018) 58004 Published online: 28 September 2018 DOI: 10.1209/0295-5075/123/58004