High-performance asymmetric supercapacitor based on graphene hydrogel and nanostructured MnO2
We have successfully fabricated an asymmetric supercapacitor with high energy and power densities using graphene hydrogel (GH) with 3D interconnected pores as the negative electrode and vertically aligned MnO2 nanoplates on nickel foam (MnO2-NF) as the positive electrode in a neutral aqueous Na2SO4...
| Հիմնական հեղինակներ: | , , , |
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| Այլ հեղինակներ: | |
| Ձևաչափ: | Journal Article |
| Լեզու: | English |
| Հրապարակվել է: |
2013
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| Առցանց հասանելիություն: | https://hdl.handle.net/10356/96519 http://hdl.handle.net/10220/10270 |
| _version_ | 1826128784861954048 |
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| author | Gao, Hongcai Xiao, Fei Ching, Chi Bun Duan, Hongwei |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Gao, Hongcai Xiao, Fei Ching, Chi Bun Duan, Hongwei |
| author_sort | Gao, Hongcai |
| collection | NTU |
| description | We have successfully fabricated an asymmetric supercapacitor with high energy and power densities using graphene hydrogel (GH) with 3D interconnected pores as the negative electrode and vertically aligned MnO2 nanoplates on nickel foam (MnO2-NF) as the positive electrode in a neutral aqueous Na2SO4 electrolyte. Because of the desirable porous structure, high specific capacitance and rate capability of GH and MnO2-NF, complementary potential window of the two electrodes, and the elimination of polymer binders and conducting additives, the asymmetric supercapacitor can be cycled reversibly in a wide potential window of 0–2.0 V and exhibits an energy density of 23.2 Wh kg–1 with a power density of 1.0 kW kg–1. Energy density of the asymmetric supercapacitor is significantly improved in comparison with those of symmetric supercapacitors based on GH (5.5 Wh kg–1) and MnO2-NF (6.7 Wh kg–1). Even at a high power density of 10.0 kW kg–1, the asymmetric supercapacitor can deliver a high energy density of 14.9 Wh kg–1. The asymmetric supercapacitor also presents stable cycling performance with 83.4% capacitance retention after 5000 cycles. |
| first_indexed | 2024-10-01T07:30:33Z |
| format | Journal Article |
| id | ntu-10356/96519 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:30:33Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/965192020-03-07T11:35:37Z High-performance asymmetric supercapacitor based on graphene hydrogel and nanostructured MnO2 Gao, Hongcai Xiao, Fei Ching, Chi Bun Duan, Hongwei School of Chemical and Biomedical Engineering We have successfully fabricated an asymmetric supercapacitor with high energy and power densities using graphene hydrogel (GH) with 3D interconnected pores as the negative electrode and vertically aligned MnO2 nanoplates on nickel foam (MnO2-NF) as the positive electrode in a neutral aqueous Na2SO4 electrolyte. Because of the desirable porous structure, high specific capacitance and rate capability of GH and MnO2-NF, complementary potential window of the two electrodes, and the elimination of polymer binders and conducting additives, the asymmetric supercapacitor can be cycled reversibly in a wide potential window of 0–2.0 V and exhibits an energy density of 23.2 Wh kg–1 with a power density of 1.0 kW kg–1. Energy density of the asymmetric supercapacitor is significantly improved in comparison with those of symmetric supercapacitors based on GH (5.5 Wh kg–1) and MnO2-NF (6.7 Wh kg–1). Even at a high power density of 10.0 kW kg–1, the asymmetric supercapacitor can deliver a high energy density of 14.9 Wh kg–1. The asymmetric supercapacitor also presents stable cycling performance with 83.4% capacitance retention after 5000 cycles. 2013-06-12T07:06:39Z 2019-12-06T19:31:40Z 2013-06-12T07:06:39Z 2019-12-06T19:31:40Z 2012 2012 Journal Article Gao, H., Xiao, F., Ching, C. B., & Duan, H. (2012). High-Performance Asymmetric Supercapacitor Based on Graphene Hydrogel and Nanostructured MnO2. ACS Applied Materials & Interfaces, 4(5), 2801-2810. 1944-8244 https://hdl.handle.net/10356/96519 http://hdl.handle.net/10220/10270 10.1021/am300455d en ACS applied materials & interfaces © 2012 American Chemical Society. |
| spellingShingle | Gao, Hongcai Xiao, Fei Ching, Chi Bun Duan, Hongwei High-performance asymmetric supercapacitor based on graphene hydrogel and nanostructured MnO2 |
| title | High-performance asymmetric supercapacitor based on graphene hydrogel and nanostructured MnO2 |
| title_full | High-performance asymmetric supercapacitor based on graphene hydrogel and nanostructured MnO2 |
| title_fullStr | High-performance asymmetric supercapacitor based on graphene hydrogel and nanostructured MnO2 |
| title_full_unstemmed | High-performance asymmetric supercapacitor based on graphene hydrogel and nanostructured MnO2 |
| title_short | High-performance asymmetric supercapacitor based on graphene hydrogel and nanostructured MnO2 |
| title_sort | high performance asymmetric supercapacitor based on graphene hydrogel and nanostructured mno2 |
| url | https://hdl.handle.net/10356/96519 http://hdl.handle.net/10220/10270 |
| work_keys_str_mv | AT gaohongcai highperformanceasymmetricsupercapacitorbasedongraphenehydrogelandnanostructuredmno2 AT xiaofei highperformanceasymmetricsupercapacitorbasedongraphenehydrogelandnanostructuredmno2 AT chingchibun highperformanceasymmetricsupercapacitorbasedongraphenehydrogelandnanostructuredmno2 AT duanhongwei highperformanceasymmetricsupercapacitorbasedongraphenehydrogelandnanostructuredmno2 |