MATERIALS LETTERS
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2023
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IF 3
Sundaraperumal Kanniga Devi,Vediyappan Thirumal,A. Balamurugan,Balakrishna Avula,Uma Devi Pongiya,Jinho Kim,Chinnasamy Surya
In a hydrothermal process, the NiCoMn(OH) 6 (NiCoMn-LDH) was synthesized. Tetracycline (TC) degradation being exposed to visible light provided an evaluation of the photocatalytic performance of the catalysts as prepared. About 96% of the TC was removed at its maximum by the NiCoMn-LDH that was employed. The NiCoMn-LDH performed better at degrading materials than Mn 2 O 3 performed. Discussions were held regarding the potential photocatalytic degradation mechanism.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
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2022
·Vol. 51
·期 8
·3314-3322
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IF 4.569
Lu Wang,Junhua You,Yao Zhao,Wanting Bao
The core–shell structured CuO@NiCoMn-LDH electrode was synthesized by wet chemistry, calcination, and electrodeposition. The synergistic effect of CuO nanowires and NiCoMn-LDH nanosheets has a significant enhancement effect on electrode materials. At the same time, the Mn content plays a decisive role in regulating and optimizing the morphology and electrochemical performance of electrode materials. The optimized CuO@NiCoMn-LDH, a binder-free electrode, exhibits excellent electrochemical performance. It displays a high specific capacity of 2.66 mA h cm−2 (20.7 F cm−2, 336.71 mA h g−1) at 10 mA cm−2 and satisfactory cycling stability (under a current density of 30 mA cm−2, after 3000 cycles, the capacity retention rate is 94.82%). In addition, an asymmetric supercapacitor (ASC) is built using the CuO@NiCoMn-LDH electrode as the positive electrode and Fe3O4@C/CuO electrode as the negative electrode to demonstrate its practical applicability in energy storage devices. At a power density of 4.79 mW cm−2, the ASC device can achieve a maximum energy density of 2.67 mW h cm−2. Two ASC devices are used as the power source of the light emitting diode (LED), which can emit light continuously for 15 minutes, showing great potential in energy storage device applications.
研究领域:
材料科学
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能源存储
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Jianfeng Dai,Zhaokuan Li,Rui Yu,Danqiang Huang
Metal element selection and reasonable design of material morphology are essential to ensure the improvement of supercapacitor electrochemical performance. In this work, based on the cobalt salts and manganese salts in the bimetallic organic framework with different molar ratios, a ternary layered double hydroxide electrode material with a hollow polyhedral structure was made by Ni 2+ etching the bimetallic organic framework to assess its suitability for use in a supercapacitor. When the molar ratio of Co/Mn is 3:1, NiCoMn-LDH 3:1 has a maximum specific capacity of 227.8 mAh g −1 at the current density of 1 A g −1 and a capacity retention rate after 1500 cycles is 83.9% at the large current density of 10 A g −1 . Additionally, an asymmetric supercapacitor was assembled with NiCoMn LDH 3:1 as the positive electrode and AC as the negative electrode. The prepared NiCoMn-LDH 3:1//AC ASC device showed a high energy density of 64.3 Wh kg −1 at 799.9 W kg −1 . Meanwhile, NiCoMn-LDH 3:1//AC ASC devices have excellent cycle stability, with a capacitance retention rate of 85.1% of the initial capacity after 5000 cycles at a high current density of 10 A g −1 . This work provides a new idea for the development of supercapacitor materials .
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 7
·573
·
IF 4.4
Zhou Wang,Yijie Lian,Xinde Zhu,Qi Wang
The application of transition metal hydroxides has long been plagued by its poor conductivity and stability as well as severe aggregation tendency. In this paper, a novel hierarchical core–shell architecture, using an F-doped Co(OH)2nanorod array (Co(OH)F) as the core and Mn/Ni co-doped Co(OH)2nanosheets (NiCoMn-LDH) as the shell, was constructed via an MOF-mediated in situ generation method. The obtained Co(OH)F@ NiCoMn-LDH composites exhibited excellent supercapacitive performance with large specific capacitance as well as improved rate capability and long-term stability. The effect of the Ni/Mn ratio on the supercapacitive performance and energy storage kinetics was systematically investigated and the related mechanism was revealed.
研究领域:
材料科学
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能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Green Energy & Environment
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2024
·
IF 10.7
Xiaojie Xu,Huachen Lin,Jinrui Ding,Pengjie Zhou,Yulong Ying,Hong Jia,Longhua Li,Yu Liu
Nanostructure engineering and composition rationalization are crucial for materials to become candidates for high-performance supercapacitor. Herein, a novel core-shell heterostructured electrode, combining CoS hollow nanorods with NiCoMn-layered double hydroxides (LDH) ternary metal nanosheets, were prepared on carbon cloth by reasonably controlled vulcanization and electrodeposition. By optimizing electrodeposition conditions, the material's structure and properties can be fine-tuned. The enhanced capacitance of the optimized carbon cloth (CC)@CoS/NiCoMn-LDH-300 electrode (4256.0 F g −1 ) lies in the open space provided by CoS and the establishment of a new charge transfer channel across the interfaces of CC@CoS/NiCoMn-LDH-300 nanosheets. This is further demonstrated by Density functional theory (DFT) simulations based on OH − adsorption energy, which produces faster redox charge kinetics and significantly enhances the electrode's energy storage capacity. The hybrid supercapacitor, integrating the optimized CC@CoS/NiCoMn-LDH-300 electrode with active carbon, demonstrates the highest energy density of 86 Wh kg −1 (under the power density of 850 W kg −1 ) and the long cycle stability of 89.7%. This study aims to go beyond simple binary LDH by constructing a ternary LDH with a hierarchical core-shell heterostructure to provide an effective and feasible new concept for high-performance supercapacitor electrode materials via rational structure design.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
Small
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2023
·
IF 13.3
Zhongqi Lu,Kai Zhao,Hanwen Guo,Lejiao Duan,Huiru Sun,Kuiyong Chen,Jingquan Liu
Active compounds based on LDH (ternary layered double hydroxide) are considered the perfect supercapacitor electrode materials on account of their superior electrochemical qualities and distinct structural characteristics, and flexible supercapacitors are an ideal option as an energy source for wearable electronics. However, the prevalent aggregation effect of LDH materials results in significantly compromised actual specific capacitance, which limits its broad practical applications. In this research, a 3D eggshell-like interconnected porous carbon (IPC) framework with confinement and isolation capability is designed and synthesized by using glucose as the carbon source to disperse the LDH active material and enhance the conductivity of the composite material. Second, by constructing NiCoMn-LDH nanocage structure based on ZIF-67 (zeolitic imidazolate framework-67) at the nanometer scale the obtained IPC/NiCoMn-LDH electrode material can expose more active sites, which allows to achieve excellent specific capacitance (2236 F g −1 / 310.6 mAh g −1 at 1 A g −1 ), good rate as well as the desired cycle stability (85.9% of the initial capacitance upon 5000 cycles test). The constructed IPC/NiCoMn-LDH//IPC ASC (asymmetric supercapacitor) exhibits superior capacitive property (135 F g −1 /60.1 mAh g −1 at 0.5 A g −1 ) as well as desired energy density (40 Wh kg −1 at 800 W kg −1 ).
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2023
·
IF 10.9
Xiaohui Guan,Jingyang Chen,Enze Zhu,Penggang Yin,Liu Yang,Xin Guan,Guangsheng Wang
Layered double hydroxides (LDHs) are promising electrode candidates for supercapacitors. However, limitations like inferior cycling stability and unsatisfactory charge storage capability at low temperatures have exerted negative effects on their applications. Herein, a novel synthetic process has been elaborately designed and provided to have the composition and structure of the C/N-NiCoMn-LDH/Ag (C/N-CNMA) delicately regulated. Both the experimental and theoretical researches unveil that the incorporated manganese species and elemental silver could dramatically modulate the bandgap, crystallinity and surface electron structure of the LDH , leading to the remarkable improvement in its conductivity, exposed active sites and intrinsic electrochemical activity, and thus the OH* and O* adsorption free energy could be remarkably optimized, even at low temperatures. In addition, the low crystallinity C/N-CNMA is of great electrochemical compatibility with both the KOH aqueous electrolyte and the isobutyl alcohol (IPA) modulated organohydrogel electrolyte. By means of adjusting the solvation and hydrogen bonding in the electrolytes, the assembled hybrid supercapacitors deliver excellent energy density, power density and cycling stability in the temperature range of -30 to 25 °C. Specifically, the gel electrolyte with IPA as the anti-freezing functional additive displays high flexibility and ionic conductivity at low temperatures.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
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