Facile Synthesis of Nitrogen-Doped Graphene Quantum Dots/MnCO<sub>3</sub>/ZnMn<sub>2</sub>O<sub>4</sub> on Ni Foam Composites for High-Performance Supercapacitor Electrodes
This study reports the facile synthesis of rationally designed composite materials consisting of nitrogen-doped graphene quantum dots (N-GQDs) and MnCO<sub>3</sub>/ZnMn<sub>2</sub>O<sub>4</sub> (N/MC/ZM) on Ni foam using a simple hydrothermal method to produce hig...
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| Online Access: | https://www.mdpi.com/1996-1944/17/4/884 |
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| author | Di Liu Soeun Kim Won Mook Choi |
| author_facet | Di Liu Soeun Kim Won Mook Choi |
| author_sort | Di Liu |
| collection | DOAJ |
| description | This study reports the facile synthesis of rationally designed composite materials consisting of nitrogen-doped graphene quantum dots (N-GQDs) and MnCO<sub>3</sub>/ZnMn<sub>2</sub>O<sub>4</sub> (N/MC/ZM) on Ni foam using a simple hydrothermal method to produce high-performance supercapacitor applications. The N/MC/ZM composite was uniformly synthesized on a Ni foam surface with the hierarchical structure of microparticles and nanosheets, and the uniform deposition of N-GQDs on a MC/ZM surface was observed. The incorporation of N-GQDs with MC/ZM provides good conductivity, charge transfer, and electrolyte diffusion for a better electrochemical performance. The N/MC/ZM composite electrode delivered a high specific capacitance of 960.6 F·g<sup>−1</sup> at 1 A·g<sup>−1</sup>, low internal resistance, and remarkable cycling stability over 10,000 charge–discharge cycles. Additionally, an all-flexible solid-state asymmetric supercapacitor (ASC) device was fabricated using the N/MC/ZM composite electrode. The fabricated ASC device produced a maximum energy density of 58.4 Wh·kg<sup>−1</sup> at a power density of 800 W·kg<sup>−1</sup> and showed a stable capacitive performance while being bent, with good mechanical stability. These results provide a promising and effective strategy for developing supercapacitor electrodes with a high areal capacitance and high energy density. |
| first_indexed | 2024-03-07T22:22:59Z |
| format | Article |
| id | doaj.art-94c6573ac9ae4dc89d51565b93599f50 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-07T22:22:59Z |
| publishDate | 2024-02-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-94c6573ac9ae4dc89d51565b93599f502024-02-23T15:25:40ZengMDPI AGMaterials1996-19442024-02-0117488410.3390/ma17040884Facile Synthesis of Nitrogen-Doped Graphene Quantum Dots/MnCO<sub>3</sub>/ZnMn<sub>2</sub>O<sub>4</sub> on Ni Foam Composites for High-Performance Supercapacitor ElectrodesDi Liu0Soeun Kim1Won Mook Choi2School of Chemical Engineering, University of Ulsan, 93 Daehak-ro, Nam-gu, Ulsan 44610, Republic of KoreaSchool of Chemical Engineering, University of Ulsan, 93 Daehak-ro, Nam-gu, Ulsan 44610, Republic of KoreaSchool of Chemical Engineering, University of Ulsan, 93 Daehak-ro, Nam-gu, Ulsan 44610, Republic of KoreaThis study reports the facile synthesis of rationally designed composite materials consisting of nitrogen-doped graphene quantum dots (N-GQDs) and MnCO<sub>3</sub>/ZnMn<sub>2</sub>O<sub>4</sub> (N/MC/ZM) on Ni foam using a simple hydrothermal method to produce high-performance supercapacitor applications. The N/MC/ZM composite was uniformly synthesized on a Ni foam surface with the hierarchical structure of microparticles and nanosheets, and the uniform deposition of N-GQDs on a MC/ZM surface was observed. The incorporation of N-GQDs with MC/ZM provides good conductivity, charge transfer, and electrolyte diffusion for a better electrochemical performance. The N/MC/ZM composite electrode delivered a high specific capacitance of 960.6 F·g<sup>−1</sup> at 1 A·g<sup>−1</sup>, low internal resistance, and remarkable cycling stability over 10,000 charge–discharge cycles. Additionally, an all-flexible solid-state asymmetric supercapacitor (ASC) device was fabricated using the N/MC/ZM composite electrode. The fabricated ASC device produced a maximum energy density of 58.4 Wh·kg<sup>−1</sup> at a power density of 800 W·kg<sup>−1</sup> and showed a stable capacitive performance while being bent, with good mechanical stability. These results provide a promising and effective strategy for developing supercapacitor electrodes with a high areal capacitance and high energy density.https://www.mdpi.com/1996-1944/17/4/884N-GQDsMnCO<sub>3</sub>/ZnMn<sub>2</sub>O<sub>4</sub>hydrothermalhierarchicalsupercapacitors |
| spellingShingle | Di Liu Soeun Kim Won Mook Choi Facile Synthesis of Nitrogen-Doped Graphene Quantum Dots/MnCO<sub>3</sub>/ZnMn<sub>2</sub>O<sub>4</sub> on Ni Foam Composites for High-Performance Supercapacitor Electrodes Materials N-GQDs MnCO<sub>3</sub>/ZnMn<sub>2</sub>O<sub>4</sub> hydrothermal hierarchical supercapacitors |
| title | Facile Synthesis of Nitrogen-Doped Graphene Quantum Dots/MnCO<sub>3</sub>/ZnMn<sub>2</sub>O<sub>4</sub> on Ni Foam Composites for High-Performance Supercapacitor Electrodes |
| title_full | Facile Synthesis of Nitrogen-Doped Graphene Quantum Dots/MnCO<sub>3</sub>/ZnMn<sub>2</sub>O<sub>4</sub> on Ni Foam Composites for High-Performance Supercapacitor Electrodes |
| title_fullStr | Facile Synthesis of Nitrogen-Doped Graphene Quantum Dots/MnCO<sub>3</sub>/ZnMn<sub>2</sub>O<sub>4</sub> on Ni Foam Composites for High-Performance Supercapacitor Electrodes |
| title_full_unstemmed | Facile Synthesis of Nitrogen-Doped Graphene Quantum Dots/MnCO<sub>3</sub>/ZnMn<sub>2</sub>O<sub>4</sub> on Ni Foam Composites for High-Performance Supercapacitor Electrodes |
| title_short | Facile Synthesis of Nitrogen-Doped Graphene Quantum Dots/MnCO<sub>3</sub>/ZnMn<sub>2</sub>O<sub>4</sub> on Ni Foam Composites for High-Performance Supercapacitor Electrodes |
| title_sort | facile synthesis of nitrogen doped graphene quantum dots mnco sub 3 sub znmn sub 2 sub o sub 4 sub on ni foam composites for high performance supercapacitor electrodes |
| topic | N-GQDs MnCO<sub>3</sub>/ZnMn<sub>2</sub>O<sub>4</sub> hydrothermal hierarchical supercapacitors |
| url | https://www.mdpi.com/1996-1944/17/4/884 |
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