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...
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| Format: | Article |
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Nature Portfolio
2021-01-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-021-81483-2 |
| _version_ | 1818345371868332032 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-13T17:01:19Z |
| format | Article |
| id | doaj.art-c03e0d8c7fbd434ab948327a78bef1d1 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-13T17:01:19Z |
| publishDate | 2021-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-c03e0d8c7fbd434ab948327a78bef1d12022-12-21T23:37:47ZengNature PortfolioScientific Reports2045-23222021-01-011111610.1038/s41598-021-81483-2AlO6 clusters’ electric storage effect in amorphous alumina supercapacitorsMikio Fukuhara0Tomoyuki Kuroda1Fumihiko Hasegawa2Toshiyuki Hashida3Mitsuhiro Takeda4Kazuya Konno5Nobuhisa Fujima6New Industry Creation Hatchery Center, Tohoku UniversityNew Industry Creation Hatchery Center, Tohoku UniversityNew Industry Creation Hatchery Center, Tohoku UniversityFracture and Reliability Research Institute, Graduate School of Engineering, Tohoku UniversityNational Institute of Technology, Sendai CollegeNational Institute of Technology, Sendai CollegeFaculty of Engineering, Shizuoka UniversityAbstract 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.https://doi.org/10.1038/s41598-021-81483-2 |
| spellingShingle | Mikio Fukuhara Tomoyuki Kuroda Fumihiko Hasegawa Toshiyuki Hashida Mitsuhiro Takeda Kazuya Konno Nobuhisa Fujima AlO6 clusters’ electric storage effect in amorphous alumina supercapacitors Scientific Reports |
| title | 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_short | AlO6 clusters’ electric storage effect in amorphous alumina supercapacitors |
| title_sort | alo6 clusters electric storage effect in amorphous alumina supercapacitors |
| url | https://doi.org/10.1038/s41598-021-81483-2 |
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