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Xu X, Xu D, Ding J, Zhou P, Ying Y, Liu Y. Nitrogen-doped graphene quantum dots embedding CuCo-LDH hierarchical hollow structure for boosted charge storage capability in supercapacitor. J Colloid Interface Sci 2023; 649:355-363. [PMID: 37352566 DOI: 10.1016/j.jcis.2023.06.106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 06/14/2023] [Accepted: 06/16/2023] [Indexed: 06/25/2023]
Abstract
The nanostructure optimization of layered double hydroxide (LDH) can effectively alleviate fragile agglomerated problems. Herein, nitrogen-doped graphene quantum dots (NGQDs) embedded in CuCo-LDH hierarchical hollow structure is synthesized by hydrothermal and impregnation methods. The electrochemical results show that the ordered multi-component structure could effectively inhibit the aggregation and layer stacking. At the same time, the hierarchical structure establishes new electron and ion transfer channels, greatly reducing the resistance of interlayer transport and accelerating the diffusion rate of electrolyte ions. Besides, NGQDs have both good electrical conductivity and abundant active sites, which can further improve the electron transmission rate and effectively strengthen the energy storage capacity of the material. Therefore, the large specific capacity of 1009 F g-1 can be displayed at 1 A g-1. The energy density of the assembled carbon cloth (CC)@CuCo-LDH/NGQDs//activated carbon (AC) device can reach 58.6 Wh kg-1 at 850 W kg-1. Above test results indicate that CC@CuCo-LDH/NGQDs//AC devices exhibit stable multi-component hierarchical structure and excellent electrical conductivity, which provides an effective strategy for enhancing the electrochemical characteristics of asymmetric supercapacitors.
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Affiliation(s)
- Xiaojie Xu
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Dongbo Xu
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Jinrui Ding
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Pengjie Zhou
- School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China
| | - Yulong Ying
- School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, PR China
| | - Yu Liu
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
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Jiao Z, Chen Y, Du M, Demir M, Yan F, Xia W, Zhang Y, Wang C, Gu M, Zhang X, Zou J. 3D hollow NiCo LDH nanocages anchored on 3D CoO sea urchin-like microspheres: A novel 3D/3D structure for hybrid supercapacitor electrodes. J Colloid Interface Sci 2023; 633:723-736. [PMID: 36508396 DOI: 10.1016/j.jcis.2022.11.131] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Revised: 11/23/2022] [Accepted: 11/25/2022] [Indexed: 12/12/2022]
Abstract
The research on the structure of advanced electrode materials is significant in the field of supercapacitors. Herein, for the first time, we propose a novel 3D/3D composite structure by a multi-step process, in which 3D hollow NiCo LDH nanocages are immobilized on 3D sea urchin-like CoO microspheres. Results show that the 3D CoO acts as an efficient and stable channel for ion diffusion, while the hollow NiCo LDH provides abundant redox-active sites. The calculated results based on density function theory (DFT) show that the CoO@NiCo LDH heterostructure has an enhanced density of states (DOS) near the Fermi level and strong adsorption capacity for OH-, indicating its excellent electrical conductivity and electrochemical reaction kinetics. As a result, the CoO@NiCo LDH electrode has an areal specific capacity of 4.71C cm-2 at a current density of 3 mA cm-2 (440.19C g-1 at 0.28 A g-1) and can still maintain 88.76 % of the initial capacitance after 5000 cycles. In addition, the assembled hybrid supercapacitor has an energy density of 5.59 mWh cm-3 at 39.54 mW cm-3.
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Affiliation(s)
- Zhichao Jiao
- School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
| | - Yuanqing Chen
- School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China.
| | - Miao Du
- School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
| | - Muslum Demir
- Department of Chemical Engineering, Osmaniye Korkut Ata University, Osmaniye 80000, Turkey
| | - Fuxue Yan
- School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
| | - Weimin Xia
- School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
| | - Ying Zhang
- School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
| | - Cheng Wang
- School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
| | - Mengmeng Gu
- School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
| | - Xiaoxuan Zhang
- School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
| | - Juntao Zou
- Engineering Research Center of Conducting Materials and Composite Technology, Ministry of Education, Xi'an University of Technology, Xi'an 710048, China; Shaanxi Province Key Laboratory of Electrical Materials and Infiltration Technology, Xi'an University of Technology, Xi'an 710048, China
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Liu A, Tang L, Gong L, Wu S, Tang J. Decorating cobalt selenide nanoparticles on polypyrrole nanowires as nanocomposite electrodes for hybrid supercapacitors. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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