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Qiang X, Jia B, Wu X. V-Doping Strategy Induces the Construction of the CoFe-LDHs/NF Electrodes with Higher Conductivity to Achieve Higher Energy Density for Advanced Energy Storage Devices. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2404557. [PMID: 38984744 DOI: 10.1002/smll.202404557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2024] [Revised: 06/26/2024] [Indexed: 07/11/2024]
Abstract
Doping of metal ions shows promising potential in optimizing and modulating the electrical conductivity of layered double hydroxides (LDHs). However, there is still much room for improvement in common metal ions and conventional doping methods. In contrast to previous methodologies, a hollow triangular nanoflower structure of CoFeV-LDHs is devised, which is enriched with a greater number of oxygen vacancies. This resulted in a significant enhancement in the conductivity of the LDHs, leading to an increase in energy density following the appropriate doping of V. To investigate the impact of V-doping on the energy density of the LDHs, in situ XPS and in situ X-ray spectroscopy is employed. Regarding electrochemical performance, the CoFeV-LDHs/NF electrode with optimal doping ratio exhibited a specific capacitance of 881 F g-1 at a current density of 1 A g-1. The capacitance remained at 90.53% after 3000 cycles. In addition, the constructed battery-type supercapacitor CoFeV-LDHs/NF-2//AC exhibited an impressive energy density of 124.7 Wh kg-1 at a power density of 850 W kg-1 and capacitance remained almost unchanged at 95.2% after 3000 cycles. All the above demonstrates the great potential of V-doped LDHs and brings a new way for the subsequent research of LDHs.
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Affiliation(s)
- Xinrui Qiang
- School of Materials Science and Chemical Engineering, Xi'an Technological University, Weiyang University Park, No.2 Xuefu Middle Road, Xi'an, Shaanxi, 710021, China
| | - Bingzhe Jia
- School of Materials Science and Chemical Engineering, Xi'an Technological University, Weiyang University Park, No.2 Xuefu Middle Road, Xi'an, Shaanxi, 710021, China
| | - Xinming Wu
- School of Materials Science and Chemical Engineering, Xi'an Technological University, Weiyang University Park, No.2 Xuefu Middle Road, Xi'an, Shaanxi, 710021, China
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Gong Y, Zhao H, Sun Y, Xu D, Ye D, Tang Y, He T, Zhang J. Partially selenized FeCo layered double hydroxide as bifunctional electrocatalyst for efficient and stable alkaline (sea)water splitting. J Colloid Interface Sci 2023; 650:636-647. [PMID: 37437443 DOI: 10.1016/j.jcis.2023.07.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 06/28/2023] [Accepted: 07/03/2023] [Indexed: 07/14/2023]
Abstract
Seawater electrolysis to produce hydrogen is a clean and sustainable strategy for the development of clean and sustainable energy storage systems. However, the erosion and destruction of electrocatalysts of the devices by Cl- in seawater during splitting process make it very difficult to realize. In this work, a partially selenized FeCo layered double hydroxide (Se-FeCo-LDH) catalyst is successfully synthesized, which shows good electrocatalytic performance in seawater during water splitting due to both its excellent conductivity and large surface area. Moreover, an anion aggregation layer around the electrode during the catalytic process can be formed to avoid electrode erosion and destruction by Cl- as well as the competitive reaction of chloride oxidation with the oxygen evolution reaction (OER), which not only improves the catalytic efficiency but also the durability of the catalyst. As a result, the overpotential is only 229 mV at a current density of 100 mA cm-2 for OER in 1 M KOH. Only 1.446 V and 1.491 V voltages are required to reach a current density of 10 mA cm-2 in overall alkaline water and seawater splitting, respectively. Besides, this Se-FeCo-LDH catalyst also achieves long-term stability up to 245 h in overall alkaline seawater splitting. The development of Se-FeCo-LDH catalyst should have an enlightening effect in the field of hydrogen production by (sea)water electrolysis.
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Affiliation(s)
- Yanmei Gong
- College of Sciences & Institute for Sustainable Energy, Shanghai University, 200444, PR China
| | - Hongbin Zhao
- College of Sciences & Institute for Sustainable Energy, Shanghai University, 200444, PR China.
| | - Yu Sun
- College of Sciences & Institute for Sustainable Energy, Shanghai University, 200444, PR China
| | - Deying Xu
- College of Sciences & Institute for Sustainable Energy, Shanghai University, 200444, PR China
| | - Daixin Ye
- College of Sciences & Institute for Sustainable Energy, Shanghai University, 200444, PR China; Key Lab of Fuel Cell Technology of Guangdong, Province Guangzhou 523146, PR China.
| | - Ya Tang
- College of Sciences & Institute for Sustainable Energy, Shanghai University, 200444, PR China
| | - Ting He
- College of Sciences & Institute for Sustainable Energy, Shanghai University, 200444, PR China
| | - Jiujun Zhang
- College of Sciences & Institute for Sustainable Energy, Shanghai University, 200444, PR China
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Biomimetic Synthesis of PANI/Graphitic Oxidized Carbon Nitride for Supercapacitor Applications. Polymers (Basel) 2022; 14:polym14183913. [PMID: 36146056 PMCID: PMC9503369 DOI: 10.3390/polym14183913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 09/10/2022] [Accepted: 09/13/2022] [Indexed: 11/17/2022] Open
Abstract
Polyaniline (PANI) composites have gained momentum as supercapacitive materials due to their high energy density and power density. However, some drawbacks in their performance remain, such as the low stability after hundreds of charge-discharge cycles and limitations in the synthesis scalability. Herein, we report for the first time PANI-Graphitic oxidized carbon nitride composites as potential supercapacitor material. The biomimetic polymerization of aniline assisted by hematin, supported by phosphorous and oxygen-modified carbon nitrides (g-POCN and g-OCN, respectively), achieved up to 89% yield. The obtained PAI/g-POCN and PANI/g-OCN show enhanced electrochemical properties, such as conductivity of up to 0.0375 S/cm, specific capacitances (Cs) of up to 294 F/g (at high current densities, 5 A/g) and a stable operation after 500 charge-discharge cycles (at 3 A/g). In contrast, the biomimetic synthesis of Free PANI, assisted by stabilized hematin in cosolvents, exhibited lower performance properties (65%). Due to their structural differences, the electrochemical properties of Free PANI (conductivity of 0.0045 S/cm and Cs of up to 82 F/g at 5 A/g) were lower than those of nanostructured PANI/g-POCN and g-OCN supports, which provide stability and improve the properties of biomimetically synthesized PANI. This work reveals the biomimetic synthesis of PANI, assisted by hematin supported by modified carbon nitrides, as a promising strategy to produce nanostructured supercapacitors with high performance.
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Hydrothermal Synthesis of Binder-Free Metallic NiCo2O4 Nano-Needles Supported on Carbon Cloth as an Advanced Electrode for Supercapacitor Applications. MATERIALS 2022; 15:ma15134499. [PMID: 35806623 PMCID: PMC9267143 DOI: 10.3390/ma15134499] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 06/14/2022] [Accepted: 06/21/2022] [Indexed: 01/15/2023]
Abstract
It is of great significance to design electrochemical energy conversion and storage materials with excellent performance to fulfill the growing energy demand. Bimetallic cobalt/nickel-based electrode materials exhibit excellent electrical conductivity compared to mono oxides. However, their potential as electrode materials for high-performance supercapacitors (SCs) is limited because of their poor cycling stability and high-capacity fading. This work demonstrates the synthesis of binder-free bimetallic NiCo2O4 nano-needles supported on CC (NCO@CC) via a facile and scalable hydrothermal process. Excellent electrical conductivity and interconnected nanostructure of NCO@CC nano-needles provide the fast transfer of electrons with numerous channels for ion diffusion. Owing to such features, the binder-free NCO@CC electrode for SC discloses excellent specific capacitance (1476 Fg−1 at 1.5 Ag−1) with 94.25% capacitance retention even after 5000 cycles. From these outstanding electrochemical performances, it can be inferred that NCO@CC nano-needle array-structured electrodes may be potential candidates for SC applications.
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Zhao Y, Zhang S, Xu S, Li X, Zhang Y, Xu Y, Zhou J, Bi H, Huang F, Lin T. A π-Conjugated Polyimide-Based High-Performance Aqueous Potassium-Ion Asymmetric Supercapacitor. Macromol Rapid Commun 2022; 43:e2200040. [PMID: 35258142 DOI: 10.1002/marc.202200040] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 02/19/2022] [Indexed: 11/08/2022]
Abstract
Aqueous asymmetric supercapacitor has captured widespread attention as a sustainable high-power energy resource. Organic electrode materials are appealing owing to their sustainability and high redox reactivity, but suffer from structural instability and low power density. Here the π-conjugated polyimide-based organic electrodes with different lengths of alkyl chains are explored to achieve high rate capability and long lifespan in an aqueous K+ -ion electrolyte. The fabricated asymmetric supercapacitor exhibits high capacities of 107 mAh g-1 at 2 A g-1 and 67 mAh g-1 at 90 A g-1 . A specific capacity of 65 mAh g-1 which is over 70% of the initial performance is obtained after 65,000 cycles. Molecular engineering of long alkyl chains in polyimide could reduce the degree of π-conjugation and spatially block the π-conjugated imide bond with limited redox activity but improved stability against chemical degradation. Further electrochemical quartz crystal microbalance (EQCM) and ex situ FTIR and XPS characterizations reveal the pseudocapacitance behavior originated from the π-conjugated polyimide-based redox reaction with potassium ions and hydrated potassium ions. We showcase a promising polyimide-based polymer with extended π-conjugated system for high-performance asymmetric supercapacitor. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Yaoyao Zhao
- Y. Zhao, S. Xu, Y. Zhang, Y. Xu, Prof. H. Bi, Prof. F. Huang, State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.,Y. Zhao, Y. Xu, Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Science, Beijing, 100049, China
| | - Shicong Zhang
- S. Zhang, Prof. T. Lin, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan RD, Shanghai, 200240, PR China
| | - Shumao Xu
- Y. Zhao, S. Xu, Y. Zhang, Y. Xu, Prof. H. Bi, Prof. F. Huang, State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Xiao Li
- X. Li, J. Zhou, Center for Alloy Innovation and Design, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Yifan Zhang
- Y. Zhao, S. Xu, Y. Zhang, Y. Xu, Prof. H. Bi, Prof. F. Huang, State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Yang Xu
- Y. Zhao, S. Xu, Y. Zhang, Y. Xu, Prof. H. Bi, Prof. F. Huang, State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.,Y. Zhao, Y. Xu, Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Science, Beijing, 100049, China
| | - Jian Zhou
- X. Li, J. Zhou, Center for Alloy Innovation and Design, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Hui Bi
- Y. Zhao, S. Xu, Y. Zhang, Y. Xu, Prof. H. Bi, Prof. F. Huang, State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Fuqiang Huang
- Y. Zhao, S. Xu, Y. Zhang, Y. Xu, Prof. H. Bi, Prof. F. Huang, State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.,Prof. F. Huang, Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Tianquan Lin
- S. Zhang, Prof. T. Lin, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan RD, Shanghai, 200240, PR China
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