AlO6 clusters’ electric storage effect in amorphous alumina supercapacitors

Abstract In this study, the electric storage effect of AlO6 clusters in amorphous alumina (AAO) supercapacitors was investigated in terms of cluster morphologies under electron-beam irradiation. Based on first-principles density functional calculation, the optimised structure of AlO6 clusters around...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Mikio Fukuhara, Tomoyuki Kuroda, Fumihiko Hasegawa, Toshiyuki Hashida, Mitsuhiro Takeda, Kazuya Konno, Nobuhisa Fujima
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c03e0d8c7fbd434ab948327a78bef1d1
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:c03e0d8c7fbd434ab948327a78bef1d1
record_format	dspace
spelling	oai:doaj.org-article:c03e0d8c7fbd434ab948327a78bef1d12021-12-02T15:23:29ZAlO6 clusters’ electric storage effect in amorphous alumina supercapacitors10.1038/s41598-021-81483-22045-2322https://doaj.org/article/c03e0d8c7fbd434ab948327a78bef1d12021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81483-2https://doaj.org/toc/2045-2322Abstract In this study, the electric storage effect of AlO6 clusters in amorphous alumina (AAO) supercapacitors was investigated in terms of cluster morphologies under electron-beam irradiation. Based on first-principles density functional calculation, the optimised structure of AlO6 clusters around an O-vacancy is characterised by a large vacant space created by the absence of an O atom and its neighbouring Al atom. The localised electrons present near the two-atomic vacancies induce positive charges on the inside of the insulating oxide surface, ensuring the adsorption of many electrons on the surface. Electron-beam irradiation (adsorption) from 100 to 180 keV causes the lengths of the Al–O bonds of the cluster to shrink, but then return to the original length with decreasing voltage energy, indicating a rocking-chair-type charge-breathing effect accompanied by a volume expansion of approximately 4%. The I–V and I–R characteristics depicted Coulomb blockade for the switching effect of both the negative and positive potentials. The Ragone plot of the AAO supercapacitor is located at capability area of the second cell.Mikio FukuharaTomoyuki KurodaFumihiko HasegawaToshiyuki HashidaMitsuhiro TakedaKazuya KonnoNobuhisa FujimaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-6 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mikio Fukuhara Tomoyuki Kuroda Fumihiko Hasegawa Toshiyuki Hashida Mitsuhiro Takeda Kazuya Konno Nobuhisa Fujima AlO6 clusters’ electric storage effect in amorphous alumina supercapacitors
description	Abstract In this study, the electric storage effect of AlO6 clusters in amorphous alumina (AAO) supercapacitors was investigated in terms of cluster morphologies under electron-beam irradiation. Based on first-principles density functional calculation, the optimised structure of AlO6 clusters around an O-vacancy is characterised by a large vacant space created by the absence of an O atom and its neighbouring Al atom. The localised electrons present near the two-atomic vacancies induce positive charges on the inside of the insulating oxide surface, ensuring the adsorption of many electrons on the surface. Electron-beam irradiation (adsorption) from 100 to 180 keV causes the lengths of the Al–O bonds of the cluster to shrink, but then return to the original length with decreasing voltage energy, indicating a rocking-chair-type charge-breathing effect accompanied by a volume expansion of approximately 4%. The I–V and I–R characteristics depicted Coulomb blockade for the switching effect of both the negative and positive potentials. The Ragone plot of the AAO supercapacitor is located at capability area of the second cell.
format	article
author	Mikio Fukuhara Tomoyuki Kuroda Fumihiko Hasegawa Toshiyuki Hashida Mitsuhiro Takeda Kazuya Konno Nobuhisa Fujima
author_facet	Mikio Fukuhara Tomoyuki Kuroda Fumihiko Hasegawa Toshiyuki Hashida Mitsuhiro Takeda Kazuya Konno Nobuhisa Fujima
author_sort	Mikio Fukuhara
title	AlO6 clusters’ electric storage effect in amorphous alumina supercapacitors
title_short	AlO6 clusters’ electric storage effect in amorphous alumina supercapacitors
title_full	AlO6 clusters’ electric storage effect in amorphous alumina supercapacitors
title_fullStr	AlO6 clusters’ electric storage effect in amorphous alumina supercapacitors
title_full_unstemmed	AlO6 clusters’ electric storage effect in amorphous alumina supercapacitors
title_sort	alo6 clusters’ electric storage effect in amorphous alumina supercapacitors
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/c03e0d8c7fbd434ab948327a78bef1d1
work_keys_str_mv	AT mikiofukuhara alo6clusterselectricstorageeffectinamorphousaluminasupercapacitors AT tomoyukikuroda alo6clusterselectricstorageeffectinamorphousaluminasupercapacitors AT fumihikohasegawa alo6clusterselectricstorageeffectinamorphousaluminasupercapacitors AT toshiyukihashida alo6clusterselectricstorageeffectinamorphousaluminasupercapacitors AT mitsuhirotakeda alo6clusterselectricstorageeffectinamorphousaluminasupercapacitors AT kazuyakonno alo6clusterselectricstorageeffectinamorphousaluminasupercapacitors AT nobuhisafujima alo6clusterselectricstorageeffectinamorphousaluminasupercapacitors
_version_	1718387290828439552

AlO6 clusters’ electric storage effect in amorphous alumina supercapacitors

Ejemplares similares