Synthesis of Needle-like Nanostructure Composite Electrode of Co<sub>3</sub>O<sub>4</sub>/rGO/NF for High-Performance Symmetric Supercapacitor
In this work, a hierarchical electrode structure of cobaltosic oxide (Co<sub>3</sub>O<sub>4</sub>) growing on a reduced graphene oxide (rGO)-covered nickel foam (NF) substrate (named Co<sub>3</sub>O<sub>4</sub>/rGO/NF) is fabricated by a facile hydroth...
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MDPI AG
2022-05-01
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| Online Access: | https://www.mdpi.com/2073-4352/12/5/664 |
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| author | Xiaoyan Wang Shixiang Lu Wenguo Xu |
| author_facet | Xiaoyan Wang Shixiang Lu Wenguo Xu |
| author_sort | Xiaoyan Wang |
| collection | DOAJ |
| description | In this work, a hierarchical electrode structure of cobaltosic oxide (Co<sub>3</sub>O<sub>4</sub>) growing on a reduced graphene oxide (rGO)-covered nickel foam (NF) substrate (named Co<sub>3</sub>O<sub>4</sub>/rGO/NF) is fabricated by a facile hydrothermal and subsequent annealing process. Thousands of nanoneedle units uniformly arranged on the surface of the rGO sheet stimulate the evident increase in the specific surface area and thus produce more active sites. Because of the special hierarchical structure, the Co<sub>3</sub>O<sub>4</sub>/rGO/NF electrode shows a high specific capacitance of 1400 F g<sup>−1</sup> at 1 A g<sup>−1</sup> and retains 58% capacitance even when the current density increases to 30 A g<sup>−1</sup>. In addition, a symmetric supercapacitor based on the Co<sub>3</sub>O<sub>4</sub>/rGO/NF electrode is assembled, exhibiting high specific capacitance of 311 F g<sup>−1</sup> at 1 A g<sup>−1</sup>, as well as remarkable power density and energy density (40.67 Wh kg<sup>−1</sup> at 12 kW kg<sup>−1</sup>). The device also demonstrates a great cycling performance after 10,000 cycles under the current density of 10 A g<sup>−1</sup>, acquiring 89.69% capacitance retention of the initial state. The accessible synthetic method and superior electrochemical performance of the Co<sub>3</sub>O<sub>4</sub>/rGO/NF composite electrode implicate its extensive application prospects in terms of new energy storage. |
| first_indexed | 2024-03-10T03:04:31Z |
| format | Article |
| id | doaj.art-221b958881044cfe86fa3703799aa16c |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T03:04:31Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-221b958881044cfe86fa3703799aa16c2023-11-23T10:35:10ZengMDPI AGCrystals2073-43522022-05-0112566410.3390/cryst12050664Synthesis of Needle-like Nanostructure Composite Electrode of Co<sub>3</sub>O<sub>4</sub>/rGO/NF for High-Performance Symmetric SupercapacitorXiaoyan Wang0Shixiang Lu1Wenguo Xu2School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, ChinaSchool of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, ChinaSchool of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, ChinaIn this work, a hierarchical electrode structure of cobaltosic oxide (Co<sub>3</sub>O<sub>4</sub>) growing on a reduced graphene oxide (rGO)-covered nickel foam (NF) substrate (named Co<sub>3</sub>O<sub>4</sub>/rGO/NF) is fabricated by a facile hydrothermal and subsequent annealing process. Thousands of nanoneedle units uniformly arranged on the surface of the rGO sheet stimulate the evident increase in the specific surface area and thus produce more active sites. Because of the special hierarchical structure, the Co<sub>3</sub>O<sub>4</sub>/rGO/NF electrode shows a high specific capacitance of 1400 F g<sup>−1</sup> at 1 A g<sup>−1</sup> and retains 58% capacitance even when the current density increases to 30 A g<sup>−1</sup>. In addition, a symmetric supercapacitor based on the Co<sub>3</sub>O<sub>4</sub>/rGO/NF electrode is assembled, exhibiting high specific capacitance of 311 F g<sup>−1</sup> at 1 A g<sup>−1</sup>, as well as remarkable power density and energy density (40.67 Wh kg<sup>−1</sup> at 12 kW kg<sup>−1</sup>). The device also demonstrates a great cycling performance after 10,000 cycles under the current density of 10 A g<sup>−1</sup>, acquiring 89.69% capacitance retention of the initial state. The accessible synthetic method and superior electrochemical performance of the Co<sub>3</sub>O<sub>4</sub>/rGO/NF composite electrode implicate its extensive application prospects in terms of new energy storage.https://www.mdpi.com/2073-4352/12/5/664Co<sub>3</sub>O<sub>4</sub> nanoneedlesreduced graphene oxidesupercapacitorsymmetric supercapacitorenergy storage |
| spellingShingle | Xiaoyan Wang Shixiang Lu Wenguo Xu Synthesis of Needle-like Nanostructure Composite Electrode of Co<sub>3</sub>O<sub>4</sub>/rGO/NF for High-Performance Symmetric Supercapacitor Crystals Co<sub>3</sub>O<sub>4</sub> nanoneedles reduced graphene oxide supercapacitor symmetric supercapacitor energy storage |
| title | Synthesis of Needle-like Nanostructure Composite Electrode of Co<sub>3</sub>O<sub>4</sub>/rGO/NF for High-Performance Symmetric Supercapacitor |
| title_full | Synthesis of Needle-like Nanostructure Composite Electrode of Co<sub>3</sub>O<sub>4</sub>/rGO/NF for High-Performance Symmetric Supercapacitor |
| title_fullStr | Synthesis of Needle-like Nanostructure Composite Electrode of Co<sub>3</sub>O<sub>4</sub>/rGO/NF for High-Performance Symmetric Supercapacitor |
| title_full_unstemmed | Synthesis of Needle-like Nanostructure Composite Electrode of Co<sub>3</sub>O<sub>4</sub>/rGO/NF for High-Performance Symmetric Supercapacitor |
| title_short | Synthesis of Needle-like Nanostructure Composite Electrode of Co<sub>3</sub>O<sub>4</sub>/rGO/NF for High-Performance Symmetric Supercapacitor |
| title_sort | synthesis of needle like nanostructure composite electrode of co sub 3 sub o sub 4 sub rgo nf for high performance symmetric supercapacitor |
| topic | Co<sub>3</sub>O<sub>4</sub> nanoneedles reduced graphene oxide supercapacitor symmetric supercapacitor energy storage |
| url | https://www.mdpi.com/2073-4352/12/5/664 |
| work_keys_str_mv | AT xiaoyanwang synthesisofneedlelikenanostructurecompositeelectrodeofcosub3subosub4subrgonfforhighperformancesymmetricsupercapacitor AT shixianglu synthesisofneedlelikenanostructurecompositeelectrodeofcosub3subosub4subrgonfforhighperformancesymmetricsupercapacitor AT wenguoxu synthesisofneedlelikenanostructurecompositeelectrodeofcosub3subosub4subrgonfforhighperformancesymmetricsupercapacitor |