Cobalt‐Nickel Ultrathin Hexagonal Nanosheets for High‐performance Asymmetric Supercapacitors
Abstract In this work, uniform ultrathin hexagonal nanosheets of Co−Ni bimetallic hydroxides are synthesized using a simple green hydrothermal synthesis method. By tuning a Co/Ni mole ratio of 1 : 2, a special nanosheet structure of Co0.32Ni0.68(OH)2 was obtained with high interlayer spacing and lar...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2023-05-01
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| Series: | ChemElectroChem |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/celc.202300023 |
| _version_ | 1797804302172946432 |
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| author | Dr. Xuebing Xu Dr. Yang Song Dr. Chaoquan Hu Dr. Mingyuan Shao Dr. Chang Li |
| author_facet | Dr. Xuebing Xu Dr. Yang Song Dr. Chaoquan Hu Dr. Mingyuan Shao Dr. Chang Li |
| author_sort | Dr. Xuebing Xu |
| collection | DOAJ |
| description | Abstract In this work, uniform ultrathin hexagonal nanosheets of Co−Ni bimetallic hydroxides are synthesized using a simple green hydrothermal synthesis method. By tuning a Co/Ni mole ratio of 1 : 2, a special nanosheet structure of Co0.32Ni0.68(OH)2 was obtained with high interlayer spacing and large pore size. This nanosheet exhibits an enhanced specific capacity as high as 1021.96 C/g at 0.5 A/g, 12 times higher than Co(OH)2 (83.23 C/g). The high electrochemical performance is attributed to the interfacial interaction between Co2+ and Ni2+, as well as its special nanosheet structure. The advantages of the composition and structure are further confirmed by density functional theory (DFT) calculations. Besides, the energy storage process was visually observed by in situ Fourier transform infrared (FTIR) spectroscopy. Furthermore, an asymmetric supercapacitor (ASC) is assembled by Co0.32Ni0.68(OH)2 and activated carbon electrodes. The ASC delivers a high energy density of 54.97 W h/kg at a power density of 1.68 kW/kg and maintains 33.52 W h/kg at 32.66 kW/kg. These results highlight the promising applications of ultrathin Co0.32Ni0.68(OH)2 nanosheets as a high‐performance electrode material in supercapacitors. |
| first_indexed | 2024-03-13T05:34:06Z |
| format | Article |
| id | doaj.art-ff7307272b8e4918bd339272e7a616a9 |
| institution | Directory Open Access Journal |
| issn | 2196-0216 |
| language | English |
| last_indexed | 2024-03-13T05:34:06Z |
| publishDate | 2023-05-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | ChemElectroChem |
| spelling | doaj.art-ff7307272b8e4918bd339272e7a616a92023-06-14T12:35:39ZengWiley-VCHChemElectroChem2196-02162023-05-011010n/an/a10.1002/celc.202300023Cobalt‐Nickel Ultrathin Hexagonal Nanosheets for High‐performance Asymmetric SupercapacitorsDr. Xuebing Xu0Dr. Yang Song1Dr. Chaoquan Hu2Dr. Mingyuan Shao3Dr. Chang Li4State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 PR ChinaNanjing IPE Institute of Green Manufacturing Industry Nanjing Jiangsu 211135 PR ChinaState Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 PR ChinaState Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 PR ChinaNanjing IPE Institute of Green Manufacturing Industry Nanjing Jiangsu 211135 PR ChinaAbstract In this work, uniform ultrathin hexagonal nanosheets of Co−Ni bimetallic hydroxides are synthesized using a simple green hydrothermal synthesis method. By tuning a Co/Ni mole ratio of 1 : 2, a special nanosheet structure of Co0.32Ni0.68(OH)2 was obtained with high interlayer spacing and large pore size. This nanosheet exhibits an enhanced specific capacity as high as 1021.96 C/g at 0.5 A/g, 12 times higher than Co(OH)2 (83.23 C/g). The high electrochemical performance is attributed to the interfacial interaction between Co2+ and Ni2+, as well as its special nanosheet structure. The advantages of the composition and structure are further confirmed by density functional theory (DFT) calculations. Besides, the energy storage process was visually observed by in situ Fourier transform infrared (FTIR) spectroscopy. Furthermore, an asymmetric supercapacitor (ASC) is assembled by Co0.32Ni0.68(OH)2 and activated carbon electrodes. The ASC delivers a high energy density of 54.97 W h/kg at a power density of 1.68 kW/kg and maintains 33.52 W h/kg at 32.66 kW/kg. These results highlight the promising applications of ultrathin Co0.32Ni0.68(OH)2 nanosheets as a high‐performance electrode material in supercapacitors.https://doi.org/10.1002/celc.202300023Co−Ni ultrathin nanosheetsDensity functional calculationsHigh energy densityIn situ FTIRSupercapacitors |
| spellingShingle | Dr. Xuebing Xu Dr. Yang Song Dr. Chaoquan Hu Dr. Mingyuan Shao Dr. Chang Li Cobalt‐Nickel Ultrathin Hexagonal Nanosheets for High‐performance Asymmetric Supercapacitors ChemElectroChem Co−Ni ultrathin nanosheets Density functional calculations High energy density In situ FTIR Supercapacitors |
| title | Cobalt‐Nickel Ultrathin Hexagonal Nanosheets for High‐performance Asymmetric Supercapacitors |
| title_full | Cobalt‐Nickel Ultrathin Hexagonal Nanosheets for High‐performance Asymmetric Supercapacitors |
| title_fullStr | Cobalt‐Nickel Ultrathin Hexagonal Nanosheets for High‐performance Asymmetric Supercapacitors |
| title_full_unstemmed | Cobalt‐Nickel Ultrathin Hexagonal Nanosheets for High‐performance Asymmetric Supercapacitors |
| title_short | Cobalt‐Nickel Ultrathin Hexagonal Nanosheets for High‐performance Asymmetric Supercapacitors |
| title_sort | cobalt nickel ultrathin hexagonal nanosheets for high performance asymmetric supercapacitors |
| topic | Co−Ni ultrathin nanosheets Density functional calculations High energy density In situ FTIR Supercapacitors |
| url | https://doi.org/10.1002/celc.202300023 |
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