Enhanced Electrochemical Performance of Metallic CoS-Based Supercapacitor by Cathodic Exfoliation
Two-dimensional nanomaterials hold great promise as electrode materials for the construction of excellent electrochemical energy storage and transformation apparatuses. In the study, metallic layered cobalt sulfide was, firstly, applied to the area of energy storage as a supercapacitor electrode. By...
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MDPI AG
2023-04-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/13/8/1411 |
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| author | Ye Tian Yuxin Ma Ruijin Sun Weichao Zhang Haikun Liu Hao Liu Libing Liao |
| author_facet | Ye Tian Yuxin Ma Ruijin Sun Weichao Zhang Haikun Liu Hao Liu Libing Liao |
| author_sort | Ye Tian |
| collection | DOAJ |
| description | Two-dimensional nanomaterials hold great promise as electrode materials for the construction of excellent electrochemical energy storage and transformation apparatuses. In the study, metallic layered cobalt sulfide was, firstly, applied to the area of energy storage as a supercapacitor electrode. By a facile and scalable method for cathodic electrochemical exfoliation, metallic layered cobalt sulfide bulk can be exfoliated into high-quality and few-layered nanosheets with size distributions in the micrometer scale range and thickness in the order of several nanometers. With a two-dimensional thin sheet structure of metallic cobalt sulfide nanosheets, not only was a larger active surface area created, but also, the insertion/extraction of ions in the procedure of charge and discharge were enhanced. The exfoliated cobalt sulfide was applied as a supercapacitor electrode with obvious improvement compared with the original sample, and the specific capacitance increased from 307 F∙g<sup>−1</sup> to 450 F∙g<sup>−1</sup> at the current density of 1 A∙g<sup>−1</sup>. The capacitance retention rate of exfoliated cobalt sulfide enlarged to 84.7% from the original 81.9% of unexfoliated samples while the current density multiplied by 5 times. Moreover, a button-type asymmetric supercapacitor assembled using exfoliated cobalt sulfide as the positive electrode exhibits a maximum specific energy of 9.4 Wh∙kg<sup>−1</sup> at the specific power of 1520 W∙kg<sup>−1</sup>. |
| first_indexed | 2024-03-11T04:40:07Z |
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| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-11T04:40:07Z |
| publishDate | 2023-04-01 |
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| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-2c04c181e3be46f9ae39645d284f30e02023-11-17T20:44:07ZengMDPI AGNanomaterials2079-49912023-04-01138141110.3390/nano13081411Enhanced Electrochemical Performance of Metallic CoS-Based Supercapacitor by Cathodic ExfoliationYe Tian0Yuxin Ma1Ruijin Sun2Weichao Zhang3Haikun Liu4Hao Liu5Libing Liao6School of Science, China University of Geosciences, Beijing 100083, ChinaSchool of Science, China University of Geosciences, Beijing 100083, ChinaSchool of Science, China University of Geosciences, Beijing 100083, ChinaBeijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, ChinaNational Center of Technology Innovation for Display, Guangdong Juhua Research Institute of Advanced Display, Guangzhou 510525, ChinaSchool of Science, China University of Geosciences, Beijing 100083, ChinaBeijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, ChinaTwo-dimensional nanomaterials hold great promise as electrode materials for the construction of excellent electrochemical energy storage and transformation apparatuses. In the study, metallic layered cobalt sulfide was, firstly, applied to the area of energy storage as a supercapacitor electrode. By a facile and scalable method for cathodic electrochemical exfoliation, metallic layered cobalt sulfide bulk can be exfoliated into high-quality and few-layered nanosheets with size distributions in the micrometer scale range and thickness in the order of several nanometers. With a two-dimensional thin sheet structure of metallic cobalt sulfide nanosheets, not only was a larger active surface area created, but also, the insertion/extraction of ions in the procedure of charge and discharge were enhanced. The exfoliated cobalt sulfide was applied as a supercapacitor electrode with obvious improvement compared with the original sample, and the specific capacitance increased from 307 F∙g<sup>−1</sup> to 450 F∙g<sup>−1</sup> at the current density of 1 A∙g<sup>−1</sup>. The capacitance retention rate of exfoliated cobalt sulfide enlarged to 84.7% from the original 81.9% of unexfoliated samples while the current density multiplied by 5 times. Moreover, a button-type asymmetric supercapacitor assembled using exfoliated cobalt sulfide as the positive electrode exhibits a maximum specific energy of 9.4 Wh∙kg<sup>−1</sup> at the specific power of 1520 W∙kg<sup>−1</sup>.https://www.mdpi.com/2079-4991/13/8/1411two-dimensional nanomaterialsmetallic cobalt sulfidecathodic exfoliationhybrid supercapacitor |
| spellingShingle | Ye Tian Yuxin Ma Ruijin Sun Weichao Zhang Haikun Liu Hao Liu Libing Liao Enhanced Electrochemical Performance of Metallic CoS-Based Supercapacitor by Cathodic Exfoliation Nanomaterials two-dimensional nanomaterials metallic cobalt sulfide cathodic exfoliation hybrid supercapacitor |
| title | Enhanced Electrochemical Performance of Metallic CoS-Based Supercapacitor by Cathodic Exfoliation |
| title_full | Enhanced Electrochemical Performance of Metallic CoS-Based Supercapacitor by Cathodic Exfoliation |
| title_fullStr | Enhanced Electrochemical Performance of Metallic CoS-Based Supercapacitor by Cathodic Exfoliation |
| title_full_unstemmed | Enhanced Electrochemical Performance of Metallic CoS-Based Supercapacitor by Cathodic Exfoliation |
| title_short | Enhanced Electrochemical Performance of Metallic CoS-Based Supercapacitor by Cathodic Exfoliation |
| title_sort | enhanced electrochemical performance of metallic cos based supercapacitor by cathodic exfoliation |
| topic | two-dimensional nanomaterials metallic cobalt sulfide cathodic exfoliation hybrid supercapacitor |
| url | https://www.mdpi.com/2079-4991/13/8/1411 |
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