Supercapacitive Characteristics and Change in Oxidation State of Mn-Ni Oxide Solid Solution Electrodes
A divalent Mn-Ni oxide solid solution electrode was prepared by a hydrothermal method, and its electrochemical characteristics were investigated. As a result of optimizing preparation and heat treatment conditions and including nanocarbon as a conducting material, the potential window of electrode w...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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The Electrochemical Society of Japan
2021-03-01
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| Series: | Electrochemistry |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/electrochemistry/89/2/89_21-00014/_pdf/-char/en |
| _version_ | 1797968615499104256 |
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| author | Yuki NIWA Junji INUKAI Shinji NOHARA |
| author_facet | Yuki NIWA Junji INUKAI Shinji NOHARA |
| author_sort | Yuki NIWA |
| collection | DOAJ |
| description | A divalent Mn-Ni oxide solid solution electrode was prepared by a hydrothermal method, and its electrochemical characteristics were investigated. As a result of optimizing preparation and heat treatment conditions and including nanocarbon as a conducting material, the potential window of electrode was successfully enlarged compared to that previously reported, reaching a specific capacitance of 363 F g−1. An aqueous electrolyte asymmetric supercapacitor consisting of electrodes of the Mn-Ni oxide including carbon (Mn-Ni-O/C) and activated carbon operated to an upper limit voltage of 2.5 V, leading to an energy density of 21.0 Wh kg−1 and an average power density of 21.8 kW kg−1. Moreover, the relationship between the oxidation number and the potential of the electrode was studied by X-ray photoelectron spectroscopy. For the first time, the oxidation number of Mn in the electrode was observed to change approximately in the range from divalent to tetravalent during the charge-discharge. This can be a very important guideline for increasing the capacitance and energy density of the Mn-based oxide electrodes. |
| first_indexed | 2024-04-11T02:48:27Z |
| format | Article |
| id | doaj.art-313b1ef8b8154d7f9b6f2eeae4c86172 |
| institution | Directory Open Access Journal |
| issn | 2186-2451 |
| language | English |
| last_indexed | 2024-04-11T02:48:27Z |
| publishDate | 2021-03-01 |
| publisher | The Electrochemical Society of Japan |
| record_format | Article |
| series | Electrochemistry |
| spelling | doaj.art-313b1ef8b8154d7f9b6f2eeae4c861722023-01-02T17:00:14ZengThe Electrochemical Society of JapanElectrochemistry2186-24512021-03-0189221121410.5796/electrochemistry.21-00014electrochemistrySupercapacitive Characteristics and Change in Oxidation State of Mn-Ni Oxide Solid Solution ElectrodesYuki NIWA0Junji INUKAI1Shinji NOHARA2Integrated Graduate School of Medicine, Engineering, and Agricultural Sciences, University of YamanashiClean Energy Research Center, University of YamanashiClean Energy Research Center, University of YamanashiA divalent Mn-Ni oxide solid solution electrode was prepared by a hydrothermal method, and its electrochemical characteristics were investigated. As a result of optimizing preparation and heat treatment conditions and including nanocarbon as a conducting material, the potential window of electrode was successfully enlarged compared to that previously reported, reaching a specific capacitance of 363 F g−1. An aqueous electrolyte asymmetric supercapacitor consisting of electrodes of the Mn-Ni oxide including carbon (Mn-Ni-O/C) and activated carbon operated to an upper limit voltage of 2.5 V, leading to an energy density of 21.0 Wh kg−1 and an average power density of 21.8 kW kg−1. Moreover, the relationship between the oxidation number and the potential of the electrode was studied by X-ray photoelectron spectroscopy. For the first time, the oxidation number of Mn in the electrode was observed to change approximately in the range from divalent to tetravalent during the charge-discharge. This can be a very important guideline for increasing the capacitance and energy density of the Mn-based oxide electrodes.https://www.jstage.jst.go.jp/article/electrochemistry/89/2/89_21-00014/_pdf/-char/enasymmetric supercapacitormanganese-based oxide solid solutionpseudocapacitanceoxidation number |
| spellingShingle | Yuki NIWA Junji INUKAI Shinji NOHARA Supercapacitive Characteristics and Change in Oxidation State of Mn-Ni Oxide Solid Solution Electrodes Electrochemistry asymmetric supercapacitor manganese-based oxide solid solution pseudocapacitance oxidation number |
| title | Supercapacitive Characteristics and Change in Oxidation State of Mn-Ni Oxide Solid Solution Electrodes |
| title_full | Supercapacitive Characteristics and Change in Oxidation State of Mn-Ni Oxide Solid Solution Electrodes |
| title_fullStr | Supercapacitive Characteristics and Change in Oxidation State of Mn-Ni Oxide Solid Solution Electrodes |
| title_full_unstemmed | Supercapacitive Characteristics and Change in Oxidation State of Mn-Ni Oxide Solid Solution Electrodes |
| title_short | Supercapacitive Characteristics and Change in Oxidation State of Mn-Ni Oxide Solid Solution Electrodes |
| title_sort | supercapacitive characteristics and change in oxidation state of mn ni oxide solid solution electrodes |
| topic | asymmetric supercapacitor manganese-based oxide solid solution pseudocapacitance oxidation number |
| url | https://www.jstage.jst.go.jp/article/electrochemistry/89/2/89_21-00014/_pdf/-char/en |
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