Layer-by-Layer Heterostructure of MnO<sub>2</sub>@Reduced Graphene Oxide Composites as High-Performance Electrodes for Supercapacitors
In this paper, <i>δ</i>-MnO<sub>2</sub> with layered structure was prepared by a facile liquid phase method, and exfoliated MnO<sub>2</sub> nanosheet (e-MnO<sub>2</sub>) was obtained by ultrasonic exfoliation, whose surface was negatively charged. Then...
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| Format: | Article |
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MDPI AG
2022-10-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/12/11/1044 |
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| author | Tingting Liu Lei Chen Ling Chen Guoxing Tian Mingtong Ji Shuai Zhou |
| author_facet | Tingting Liu Lei Chen Ling Chen Guoxing Tian Mingtong Ji Shuai Zhou |
| author_sort | Tingting Liu |
| collection | DOAJ |
| description | In this paper, <i>δ</i>-MnO<sub>2</sub> with layered structure was prepared by a facile liquid phase method, and exfoliated MnO<sub>2</sub> nanosheet (e-MnO<sub>2</sub>) was obtained by ultrasonic exfoliation, whose surface was negatively charged. Then, positive charges were grafted on the surface of MnO<sub>2</sub> nanosheets with a polycation electrolyte of polydiallyl dimethylammonium chloride (PDDA) in different concentrations. A series of e-MnO<sub>2</sub>@reduced graphene oxide (rGO) composites were obtained by electrostatic self-assembly combined with hydrothermal chemical reduction. When PDDA was adjusted to 0.75 g/L, the thickness of e-MnO<sub>2</sub> was ~1.2 nm, and the nanosheets were uniformly adsorbed on the surface of graphene, which shows layer-by-layer morphology with a specific surface area of ~154 m<sup>2</sup>/g. On account of the unique heterostructure, the composite exhibits good electrochemical performance as supercapacitor electrodes. The specific capacitance of e-MnO<sub>2</sub>-0.75@rGO can reach 456 F/g at a current density of 1 A/g in KOH electrolyte, which still remains 201 F/g at 10 A/g. In addition, the capacitance retention is 98.7% after 10000 charge-discharge cycles at 20 A/g. Furthermore, an asymmetric supercapacitor (ASC) device of e-MnO<sub>2</sub>-0.75@rGO//graphene hydrogel (GH) was assembled, of which the specific capacitance achieves 94 F/g (1 A/g) and the cycle stability is excellent, with a retention rate of 99.3% over 10000 cycles (20 A/g). |
| first_indexed | 2024-03-09T18:52:02Z |
| format | Article |
| id | doaj.art-90cce176b0184bc6947f1bfc8829311d |
| institution | Directory Open Access Journal |
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| language | English |
| last_indexed | 2024-03-09T18:52:02Z |
| publishDate | 2022-10-01 |
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| record_format | Article |
| series | Membranes |
| spelling | doaj.art-90cce176b0184bc6947f1bfc8829311d2023-11-24T05:48:13ZengMDPI AGMembranes2077-03752022-10-011211104410.3390/membranes12111044Layer-by-Layer Heterostructure of MnO<sub>2</sub>@Reduced Graphene Oxide Composites as High-Performance Electrodes for SupercapacitorsTingting Liu0Lei Chen1Ling Chen2Guoxing Tian3Mingtong Ji4Shuai Zhou5Qinhuangdao Key Laboratory of Marine Oil and Gas Resource Exploitation and Pollution Prevention, Northeast Petroleum University at Qinhuangdao, Qinhuangdao 066004, ChinaQinhuangdao Key Laboratory of Marine Oil and Gas Resource Exploitation and Pollution Prevention, Northeast Petroleum University at Qinhuangdao, Qinhuangdao 066004, ChinaHebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, ChinaHebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, ChinaQinhuangdao Key Laboratory of Marine Oil and Gas Resource Exploitation and Pollution Prevention, Northeast Petroleum University at Qinhuangdao, Qinhuangdao 066004, ChinaHebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, ChinaIn this paper, <i>δ</i>-MnO<sub>2</sub> with layered structure was prepared by a facile liquid phase method, and exfoliated MnO<sub>2</sub> nanosheet (e-MnO<sub>2</sub>) was obtained by ultrasonic exfoliation, whose surface was negatively charged. Then, positive charges were grafted on the surface of MnO<sub>2</sub> nanosheets with a polycation electrolyte of polydiallyl dimethylammonium chloride (PDDA) in different concentrations. A series of e-MnO<sub>2</sub>@reduced graphene oxide (rGO) composites were obtained by electrostatic self-assembly combined with hydrothermal chemical reduction. When PDDA was adjusted to 0.75 g/L, the thickness of e-MnO<sub>2</sub> was ~1.2 nm, and the nanosheets were uniformly adsorbed on the surface of graphene, which shows layer-by-layer morphology with a specific surface area of ~154 m<sup>2</sup>/g. On account of the unique heterostructure, the composite exhibits good electrochemical performance as supercapacitor electrodes. The specific capacitance of e-MnO<sub>2</sub>-0.75@rGO can reach 456 F/g at a current density of 1 A/g in KOH electrolyte, which still remains 201 F/g at 10 A/g. In addition, the capacitance retention is 98.7% after 10000 charge-discharge cycles at 20 A/g. Furthermore, an asymmetric supercapacitor (ASC) device of e-MnO<sub>2</sub>-0.75@rGO//graphene hydrogel (GH) was assembled, of which the specific capacitance achieves 94 F/g (1 A/g) and the cycle stability is excellent, with a retention rate of 99.3% over 10000 cycles (20 A/g).https://www.mdpi.com/2077-0375/12/11/1044MnO<sub>2</sub>reduced graphene oxide (rGO)layer-by-layersupercapacitor |
| spellingShingle | Tingting Liu Lei Chen Ling Chen Guoxing Tian Mingtong Ji Shuai Zhou Layer-by-Layer Heterostructure of MnO<sub>2</sub>@Reduced Graphene Oxide Composites as High-Performance Electrodes for Supercapacitors Membranes MnO<sub>2</sub> reduced graphene oxide (rGO) layer-by-layer supercapacitor |
| title | Layer-by-Layer Heterostructure of MnO<sub>2</sub>@Reduced Graphene Oxide Composites as High-Performance Electrodes for Supercapacitors |
| title_full | Layer-by-Layer Heterostructure of MnO<sub>2</sub>@Reduced Graphene Oxide Composites as High-Performance Electrodes for Supercapacitors |
| title_fullStr | Layer-by-Layer Heterostructure of MnO<sub>2</sub>@Reduced Graphene Oxide Composites as High-Performance Electrodes for Supercapacitors |
| title_full_unstemmed | Layer-by-Layer Heterostructure of MnO<sub>2</sub>@Reduced Graphene Oxide Composites as High-Performance Electrodes for Supercapacitors |
| title_short | Layer-by-Layer Heterostructure of MnO<sub>2</sub>@Reduced Graphene Oxide Composites as High-Performance Electrodes for Supercapacitors |
| title_sort | layer by layer heterostructure of mno sub 2 sub reduced graphene oxide composites as high performance electrodes for supercapacitors |
| topic | MnO<sub>2</sub> reduced graphene oxide (rGO) layer-by-layer supercapacitor |
| url | https://www.mdpi.com/2077-0375/12/11/1044 |
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