Unique 3D flower-on-sheet nanostructure of NiCo LDHs : controllable microwave-assisted synthesis and its application for advanced supercapacitors
Two-dimensional (2D) nanostructures, though promising in energy storage, suffer from aggregation and subsequent deterioration of performance in practical applications. Hence, assembly of 2D nanostructures into three-dimensional (3D) architectures is highly desirable. Here, we report a microwave-assi...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2021
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| Online Access: | https://hdl.handle.net/10356/151348 |
| _version_ | 1811677054391812096 |
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| author | Zhou, Yanping Li, Jing Yang, Yang Luo, Bin Zhang, Xiong Fong, Eileen Chu, Wei Huang, Kama |
| author2 | School of Materials Science and Engineering |
| author_facet | School of Materials Science and Engineering Zhou, Yanping Li, Jing Yang, Yang Luo, Bin Zhang, Xiong Fong, Eileen Chu, Wei Huang, Kama |
| author_sort | Zhou, Yanping |
| collection | NTU |
| description | Two-dimensional (2D) nanostructures, though promising in energy storage, suffer from aggregation and subsequent deterioration of performance in practical applications. Hence, assembly of 2D nanostructures into three-dimensional (3D) architectures is highly desirable. Here, we report a microwave-assisted approach to the controllable synthesis of 2D materials with tunable 3D structures simply by adjusting the ratio of water/ethylene glycol (H2O/EG). Novel flower-on-sheet 3D hierarchical structures of nickel cobalt double hydroxide (NiCo LDHs) are obtained at EG content of 40%, while microspheres and 2D nanosheets are obtained when the EG content is 0% and 75%, respectively. We propose that under microwave irradiation, EG molecules disperse the nuclei and facilitate the initial formation of 2D sheets. Subsequently, the dominating hydrophobicity of the assembling results in the formation of nanoflowers on the sheets. When tested as electrode materials in supercapacitors, the flower-on-sheet NiCo LDH exhibits superior capacitance (1187.2 F g−1 at 1 A g−1), good rate capability (71% retention at 30 A g−1), and high stability (only 0.3% cyclic decay per cycle with respect to the first charge capacitance), which is ascribed to that ‘sheet’ could act as buffer substrate while ‘flower’ expose more active site. Our results demonstrate an energy-saving and one-pot approach for controllable construction of 2D derived 3D nanostructure that can be applied in next-generation energy storage materials. |
| first_indexed | 2024-10-01T02:31:16Z |
| format | Journal Article |
| id | ntu-10356/151348 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:31:16Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1513482021-07-09T02:00:22Z Unique 3D flower-on-sheet nanostructure of NiCo LDHs : controllable microwave-assisted synthesis and its application for advanced supercapacitors Zhou, Yanping Li, Jing Yang, Yang Luo, Bin Zhang, Xiong Fong, Eileen Chu, Wei Huang, Kama School of Materials Science and Engineering Engineering::Materials Flower-on-sheet Architecture Microwave Synthesis Two-dimensional (2D) nanostructures, though promising in energy storage, suffer from aggregation and subsequent deterioration of performance in practical applications. Hence, assembly of 2D nanostructures into three-dimensional (3D) architectures is highly desirable. Here, we report a microwave-assisted approach to the controllable synthesis of 2D materials with tunable 3D structures simply by adjusting the ratio of water/ethylene glycol (H2O/EG). Novel flower-on-sheet 3D hierarchical structures of nickel cobalt double hydroxide (NiCo LDHs) are obtained at EG content of 40%, while microspheres and 2D nanosheets are obtained when the EG content is 0% and 75%, respectively. We propose that under microwave irradiation, EG molecules disperse the nuclei and facilitate the initial formation of 2D sheets. Subsequently, the dominating hydrophobicity of the assembling results in the formation of nanoflowers on the sheets. When tested as electrode materials in supercapacitors, the flower-on-sheet NiCo LDH exhibits superior capacitance (1187.2 F g−1 at 1 A g−1), good rate capability (71% retention at 30 A g−1), and high stability (only 0.3% cyclic decay per cycle with respect to the first charge capacitance), which is ascribed to that ‘sheet’ could act as buffer substrate while ‘flower’ expose more active site. Our results demonstrate an energy-saving and one-pot approach for controllable construction of 2D derived 3D nanostructure that can be applied in next-generation energy storage materials. This work was supported by the National Natural Science Foundation of China (Grant No. 61801314), National Natural Science Foundation of China (Grant No. 61731013), State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences (Grant No. KF2016-26), and National Natural Science Foundation of China (Grant No. 61501311). The authors also appreciate the technical support for Materials Characterization from The Analytical & Testing Center of Sichuan University. 2021-07-09T02:00:22Z 2021-07-09T02:00:22Z 2019 Journal Article Zhou, Y., Li, J., Yang, Y., Luo, B., Zhang, X., Fong, E., Chu, W. & Huang, K. (2019). Unique 3D flower-on-sheet nanostructure of NiCo LDHs : controllable microwave-assisted synthesis and its application for advanced supercapacitors. Journal of Alloys and Compounds, 788, 1029-1036. https://dx.doi.org/10.1016/j.jallcom.2019.02.328 0925-8388 0000-0003-4888-8574 https://hdl.handle.net/10356/151348 10.1016/j.jallcom.2019.02.328 2-s2.0-85062408676 788 1029 1036 en Journal of Alloys and Compounds © 2019 Elsevier B.V. All rights reserved. |
| spellingShingle | Engineering::Materials Flower-on-sheet Architecture Microwave Synthesis Zhou, Yanping Li, Jing Yang, Yang Luo, Bin Zhang, Xiong Fong, Eileen Chu, Wei Huang, Kama Unique 3D flower-on-sheet nanostructure of NiCo LDHs : controllable microwave-assisted synthesis and its application for advanced supercapacitors |
| title | Unique 3D flower-on-sheet nanostructure of NiCo LDHs : controllable microwave-assisted synthesis and its application for advanced supercapacitors |
| title_full | Unique 3D flower-on-sheet nanostructure of NiCo LDHs : controllable microwave-assisted synthesis and its application for advanced supercapacitors |
| title_fullStr | Unique 3D flower-on-sheet nanostructure of NiCo LDHs : controllable microwave-assisted synthesis and its application for advanced supercapacitors |
| title_full_unstemmed | Unique 3D flower-on-sheet nanostructure of NiCo LDHs : controllable microwave-assisted synthesis and its application for advanced supercapacitors |
| title_short | Unique 3D flower-on-sheet nanostructure of NiCo LDHs : controllable microwave-assisted synthesis and its application for advanced supercapacitors |
| title_sort | unique 3d flower on sheet nanostructure of nico ldhs controllable microwave assisted synthesis and its application for advanced supercapacitors |
| topic | Engineering::Materials Flower-on-sheet Architecture Microwave Synthesis |
| url | https://hdl.handle.net/10356/151348 |
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