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Chen R, Luo H, Ong BTS, Nguyen TT, Cheng L. Cation Vacancy Strategy Activated Layered Double Hydroxides: Enhanced Electrochemical Performance and Longevity. ACS APPLIED MATERIALS & INTERFACES 2024; 16:50800-50810. [PMID: 39267343 DOI: 10.1021/acsami.4c10714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/17/2024]
Abstract
The defect design strategy has been extensively employed to enhance the reaction kinetics of layered double hydroxide (LDH) electrode materials. Furthermore, it is anticipated to improve the cyclic stability of LDHs through this approach, serving a dual purpose. However, the potential mechanisms of cation vacancies' impact on the electrochemical performance of electrodes at the atomic scale still need further clarification. In this study, a typical aluminum-vacancy LDH material via a simple alkaline etching method was demonstrated. Electrochemical in situ Raman spectroscopy, ex situ X-ray diffraction (XRD), and first-principles calculations were utilized to elucidate the mechanism of Faradaic reactions. The findings indicate that this cation vacancy strategy not only enhances the electrochemical reaction kinetics of the electrodes but also effectively reduces the energy barrier for the α to γ phase transition of LDHs during the charge-discharge processes, thereby enhancing its longevity. To further validate the practical application of this defect design, an asymmetric solid-state supercapacitor was formed, which maintains 93.9% capacity after 20 000 charge-discharge cycles. This research offers technical guidance for the development of a new generation of high-performance and long-life LDH electrode materials based on a cation vacancy strategy.
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Affiliation(s)
- Rongxin Chen
- State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Hao Luo
- State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China
| | - Brandon Toon Sheng Ong
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Trang Thuy Nguyen
- Faculty of Physics, University of Science, Vietnam National University, Hanoi 11416, Vietnam
| | - Li Cheng
- State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China
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Murugesan S, Shreteh K, Afik N, Alkrenawi I, Volokh M, Mokari T. Supercapattery-Diode: Using Layered Double Hydroxide Nanosheets for Unidirectional Energy Storage. ACS APPLIED MATERIALS & INTERFACES 2024; 16:49868-49879. [PMID: 39231011 DOI: 10.1021/acsami.4c07097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/06/2024]
Abstract
The supercapacitor-diode (CAPode) is a device that integrates the functionality of an ionic diode with that of a conventional supercapacitor. The unique combination of energy storage and rectification properties in CAPodes is relevant for iontronics, alternate current rectifiers, logic operations, grid stabilization, and even biomedical applications. Here, we propose a novel aqueous-phase supercapattery-diode with excellent energy storage [total specific capacity (CT) = 162 C g-1, energy density = 34 W h kg-1 at 1.0 A g-1] as well as rectifying properties [rectification ratio I (RRI) of 23, and rectification ratio II (RRII) of 0.98]; the unidirectional energy storage is achieved by the utilization of an ion-selective redox reaction of battery-type layered double hydroxide (LDH) nanosheets serving as the electroactive material as well as asymmetric device configuration of supercapattery-diode in the KOH electrolyte. This work expands the types of CAPodes and importantly exemplifies the significance of integrating battery-type LDH and their redox chemistry, allowing a simultaneous increase in charge storage and rectification properties.
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Affiliation(s)
| | | | - Noa Afik
- Department of Chemistry, Beer-Sheva 8410501, Israel
| | | | | | - Taleb Mokari
- Department of Chemistry, Beer-Sheva 8410501, Israel
- Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
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Gao S, Fan J, Cui K, Wang Z, Huang T, Tan Z, Niu C, Luo W, Chao Z. Synthesis of FeOOH/Zn(OH) 2/CoS Ferromagnetic Nanocomposites and the Enhanced Mechanism of Magnetic Field for Their Electrochemical Performances. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2308212. [PMID: 38100280 DOI: 10.1002/smll.202308212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 11/26/2023] [Indexed: 12/17/2023]
Abstract
The FeOOH/Zn(OH)2/CoS (FZC) nanocomposites are synthesized and show the outstanding electrochemical properties in both supercapacitor and catalytic hydrogen production. The specific area capacitance reaches 17.04 F cm-2, which is more than ten times higher than that of FeOOH/Zn(OH)2 (FZ) substrate: 1.58 F cm-2). FZC nanocomposites also exhibit the excellent cycling stability with an initial capacity retention rate of 93.6% after 10 000 long-term cycles. The electrolytic cell (FZC//FZC) assembled with FZC as both anode and cathode in the UOR (urea oxidation reaction)|| HER (hydrogen evolution reaction) coupled system requires a cell voltage of only 1.453 V to drive a current density of 10 mA cm-2. Especially, the electrochemical performances of FZC nanocomposites are enhanced in magnetic field, and the mechanism is proposed based on Stern double layer model at electrode-electrolyte interface (EEI). More electrolyte ions reach the surface of FZC electrode material under Kelvin force, moreover, the warburg impedance of FZC nanocomposites decrease under magnetic field action, which results in the enhanced behaviors for both the energy storage and urea oxidation reaction .
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Affiliation(s)
- Shanqiang Gao
- College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, China
| | - Jincheng Fan
- College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, China
| | - Kexin Cui
- College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, China
| | - Zhihao Wang
- College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, China
| | - Ting Huang
- College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, China
| | - Zicong Tan
- College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, China
| | - Chaoqun Niu
- College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, China
| | - Wenbin Luo
- College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, China
| | - Zisheng Chao
- College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410114, China
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Hu J, Jiao Z, Jiang J, Hou Y, Su X, Zhang J, Feng C, Ma Y, Ma M, Liu J. Simple fabrication of cobalt-nickel alloy/carbon nanocomposite fibers for tunable microwave absorption. J Colloid Interface Sci 2023; 652:1825-1835. [PMID: 37683410 DOI: 10.1016/j.jcis.2023.09.009] [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: 04/12/2023] [Revised: 08/31/2023] [Accepted: 09/01/2023] [Indexed: 09/10/2023]
Abstract
A series of CoNi/C nanocomposite fibers with different Co and Ni ratios were successfully prepared by electrospinning and carbonization techniques for the study of electromagnetic microwave (EMW) absorbing materials. We systematically studied the influence of Co and Ni content on the microstructure, chemical composition, magnetic properties, and EMW absorption characteristics of the samples. The results showed that CoNi/C nanocomposite fibers obtained excellent EMW absorption ability through the reasonable design of the composition, and the Co/Ni ratio significantly affected the microstructure and EMW absorption performance. When the Co/Ni ratio was 1/3, the minimum reflection loss (RLmin) is -71.2 dB (2.4 mm, 13.4 GHz), and the maximum effective absorption bandwidth (EAB, RL<-10 dB) is up to 5.9 GHz (2.2 mm, 12.1-18 GHz), covering almost the entire Ku band. This study demonstrated the enormous potential of one-dimensional structure in the field of EMW absorption. In addition, the CoNi/C nanocomposite fiber synthesized using a straightforward and low-cost method not only has excellent EMW absorption performance but also has the potential for practical application. The results of this study provide a simple and effective approach for designing high-performance EMW absorbing materials.
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Affiliation(s)
- Jinhu Hu
- School of Civil Engineering, Qingdao University of Technology, Qingdao, 266520, Shandong, China
| | - Zhengguo Jiao
- School of Civil Engineering, Qingdao University of Technology, Qingdao, 266520, Shandong, China
| | - Jialin Jiang
- School of Civil Engineering, Qingdao University of Technology, Qingdao, 266520, Shandong, China
| | - Yongbo Hou
- School of Civil Engineering, Qingdao University of Technology, Qingdao, 266520, Shandong, China
| | - Xuewei Su
- School of Civil Engineering, Qingdao University of Technology, Qingdao, 266520, Shandong, China
| | - Jianxin Zhang
- School of Civil Engineering, Qingdao University of Technology, Qingdao, 266520, Shandong, China
| | - Chao Feng
- School of Civil Engineering, Qingdao University of Technology, Qingdao, 266520, Shandong, China
| | - Yong Ma
- School of Material Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, Shandong, China
| | - Mingliang Ma
- School of Civil Engineering, Qingdao University of Technology, Qingdao, 266520, Shandong, China.
| | - Jianxiu Liu
- School of Civil Engineering, Qingdao University of Technology, Qingdao, 266520, Shandong, China.
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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: 17] [Impact Index Per Article: 17.0] [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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Hu R, Feng Z, Gao B, Liu G, Wang X, Meng Y, Song XZ, Tan Z. Three-dimensional binder-free electrodes with high loading of electroactive material for high performance asymmetric supercapacitors. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Ren X, Sun M, Gan Z, Li Z, Cao B, Shen W, Fu Y. Hierarchically nanostructured Zn 0.76C 0.24S@Co(OH) 2 for high-performance hybrid supercapacitor. J Colloid Interface Sci 2022; 618:88-97. [PMID: 35334365 DOI: 10.1016/j.jcis.2022.03.069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Revised: 03/09/2022] [Accepted: 03/16/2022] [Indexed: 12/15/2022]
Abstract
It is a great challenge to achieve both high specific capacity and high energy density of supercapacitors by designing and constructing hybrid electrode materials through a simple but effective process. In this paper, we proposed a hierarchically nanostructured hybrid material combining Zn0.76Co0.24S (ZCS) nanoparticles and Co(OH)2 (CH) nanosheets using a two-step hydrothermal synthesis strategy. Synergistic effects between ZCS nanoparticles and CH nanosheets result in efficient ion transports during the charge-discharge process, thus achieving a good electrochemical performance of the supercapacitor. The synthesized ZCS@CH hybrid exhibits a high specific capacity of 1152.0 C g-1 at a current density of 0.5 A g-1 in 2 M KOH electrolyte. Its capacity retention rate is maintained at ∼ 70.0% when the current density is changed from 1 A g-1 to 10 A g-1. A hybrid supercapacitor (HSC) assembled from ZCS@CH as the cathode and active carbon (AC) as the anode displays a capacitance of 155.7 F g-1 at 0.5 A g-1, with a remarkable cycling stability of 91.3% after 12,000cycles. Meanwhile, this HSC shows a high energy density of 62.5 Wh kg-1 at a power density of 425.0 W kg-1, proving that the developed ZCS@CH is a promising electrode material for energy storage applications.
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Affiliation(s)
- Xiaohe Ren
- School of Physics, University of Electronic Science and Technology of China, Chengdu 6111731, PR China
| | - Mengxuan Sun
- School of Physics, University of Electronic Science and Technology of China, Chengdu 6111731, PR China
| | - Ziwei Gan
- School of Physics, University of Electronic Science and Technology of China, Chengdu 6111731, PR China
| | - Zhijie Li
- School of Physics, University of Electronic Science and Technology of China, Chengdu 6111731, PR China.
| | - Baobao Cao
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, PR China
| | - Wenzhong Shen
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Science, Taiyuan 030001, PR China
| | - YongQing Fu
- Faculty of Engineering and Environment, Northumbria University, Newcastle Upon Tyne NE1 8ST, UK.
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Ren X, Gan Z, Sun M, Fang Q, Yan Y, Sun Y, Huang J, Cao B, Shen W, Li Z, Fu Y. Colloidal synthesis of flower-like Zn doped Ni(OH)2@CNTs at room-temperature for hybrid supercapacitor with high rate capability and energy density. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Lei G, Chen D, Li Q, Liu H, Shi Q, Li C. NiCo-layered double hydroxide with cation vacancy defects for high-performance supercapacitors. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140143] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Cai B, Li J, Wang L, Li X, Yang X, Lü W. Enhanced performance of asymmetric supercapacitor based on NiZn-LDH@NiCoSe 2electrode materials. NANOTECHNOLOGY 2022; 33:295402. [PMID: 35344946 DOI: 10.1088/1361-6528/ac61ce] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 03/27/2022] [Indexed: 06/14/2023]
Abstract
While supercapacitors have been widely studied as the next generation of energy storage devices, to develop active electrode materials for enhancing device performance is still challenging. Herein, we fabricated asymmetric supercapacitors based on NiZn-Layered double hydroxide (LDH) @NiCoSe2hierarchical nanostructures as electrode materials. The NiZn-LDH@NiCoSe2composites are deposited on Ni foam by a two-step strategy, in which NiZn-LDH nanosheets were firstly grown on Ni foam by hydrothermal method, and then NiCoSe2particles were prepared by electrodeposition. Due to the synergistic effect between NiZn-LDH and NiCoSe2, excellent device performance was achieved. In a three-electrode system, the NiZn-LDH@NiCoSe2exhibits a specific capacitance of 2980 F g-1at 1 A g-1. Furthermore, the asymmetric supercapacitor of NiZn-LDH@NiCoSe2//activated carbon (AC) device was assembled, which exhibits the energy density of 49.2 Wh kg-1at the power density of 160 W kg-1, with the capacity retention rate is 91% after 8000 cycles. The results indicates that NiZn-LDH@NiCoSe2is a promising candidate as electrode materials for efficient energy storage devices.
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Affiliation(s)
- Bin Cai
- Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science, Changchun University of Technology, Changchun, Changchun 130012, People's Republic of China
| | - Jialun Li
- Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science, Changchun University of Technology, Changchun, Changchun 130012, People's Republic of China
| | - Liying Wang
- Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science, Changchun University of Technology, Changchun, Changchun 130012, People's Republic of China
| | - Xuesong Li
- Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science, Changchun University of Technology, Changchun, Changchun 130012, People's Republic of China
| | - Xijia Yang
- Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science, Changchun University of Technology, Changchun, Changchun 130012, People's Republic of China
| | - Wei Lü
- Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science, Changchun University of Technology, Changchun, Changchun 130012, People's Republic of China
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Zhou G, Gao X, Wen S, Wu X, Zhang L, Wang T, Zhao P, Yin J, Zhu W. Magnesium-regulated oxygen vacancies of cobalt-nickel layered double hydroxide nanosheets for ultrahigh performance asymmetric supercapacitors. J Colloid Interface Sci 2022; 612:772-781. [PMID: 35032928 DOI: 10.1016/j.jcis.2021.12.087] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 11/22/2021] [Accepted: 12/14/2021] [Indexed: 02/08/2023]
Abstract
Rational design of layered double hydroxide (LDH) electrodes is of great significance for high-performance supercapacitors (SCs). Herein, ultrathin cobalt-nickel-magnesium layered double hydroxide (CoNiMg-LDH) nanosheets with plentiful oxygen vacancies are synthesized via sacrificial magnesium-based replacement reaction at room temperature. Self-doping and mild reduction of magnesium can significantly increase the concentration of oxygen vacancies in CoNiMg-LDH, which promotes the electrochemical charge transfer efficiency and enhances the adsorption ability of electrolytes. Density functional theory (DFT) calculations also indicate that Mg2+ doping can decrease the formation energy of oxygen vacancies in CoNiMg-LDH nanosheets, which increases the concentration of oxygen vacancies. Thus, the assembled asymmetric supercapacitor CoNiMg-LDH//Actived Carbon accomplishes a superior capacity of ∼ 333 C g-1 (208 F g-1) at 1 A g-1 and presents a gravimetric energy density of 73.9 Wh kg-1 at 0.8 kW kg-1. It presents only 13% capacity loss at 20 A g-1 after 5000 cycles. This discovery emphasizes the positive role of magnesium in regulating oxygen vacancies to improve the performance of supercapacitors, which should be beneficial for extending the scope of superior SCs active materials.
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Affiliation(s)
- Guolang Zhou
- School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huai'an, Jiangsu 223001, PR China; School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China
| | - Xiaoliang Gao
- School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huai'an, Jiangsu 223001, PR China
| | - Shizheng Wen
- School of Physics and Electronic Electrical Engineering, Huaiyin Normal University, Huai'an, Jiangsu 223001, PR China
| | - Xinglong Wu
- School of Chemistry, Northeast Normal University, Changchun, Jilin 130024, PR China
| | - Lili Zhang
- School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huai'an, Jiangsu 223001, PR China.
| | - Tianshi Wang
- School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huai'an, Jiangsu 223001, PR China
| | - Pusu Zhao
- School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huai'an, Jiangsu 223001, PR China
| | - Jingzhou Yin
- School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huai'an, Jiangsu 223001, PR China.
| | - Wenshuai Zhu
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China.
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13
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Ma L, Hu R, Kang C, Fu L, Chen Y, Liu H, Liu Q. Facile synthesis of three-dimensional Ni3Sn2S2 as a novel battery-type electrode material for high-performance supercapacitors. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.139216] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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