One-step growth of NiCoAl layered double hydroxides microspheres toward high energy density supercapacitors

Gao, Xiaoru; Zhang, Ruikang; Huang, Xu; Shi, Weilong; Wang, Can; Gao, Yuanzhe; Han, Zhangang

doi:10.1016/j.jallcom.2020.157879

Cited by 27 publications

(11 citation statements)

References 42 publications

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“…The other two satellite peaks are ascribed to Co 2p 3/2 and Co 2p 1/2 signals. The single peak in Figure d of Al 2p indicates the Al 3+ species (Al–O) …”

Section: Results and Discussionmentioning

confidence: 99%

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Facile Preparation and Performances of Ni, Co, and Al Layered Double Hydroxides for Application in High-Performance Asymmetric Supercapacitors

Chen

Ouyang

Yang

et al. 2021

ACS Appl. Energy Mater.

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Layered double hydroxides (LDHs) are widely studied as electrode materials of supercapacitors (SCs) owing to their specific composition and morphology and plentiful electrochemically active sites. Especially, nickel cobalt hydroxides can achieve an outstanding electrochemical performance as electrode materials of SCs because of the synergy effect between Ni and Co. Herein, ternary LDHs including Ni, Co, and Al (NiCo2Al x -LDHs) with different stoichiometric ratios are synthesized by a facile method to further research the influences of Al on the morphology and electrochemical performances of LDHs. Results show that the NiCo2Al0.5-LDHs electrode delivers a high specific capacitance (1260 F g–1 at 0.5 A g–1) and an excellent capacitance retention (81.5% of initial capacitance). Besides, an asymmetric supercapacitor (ASC) assembled with a NiCo2Al0.5-LDHs cathode and an activated carbon (AC) anode (NiCo2Al0.5-LDHs//AC ASC) exhibits a high energy density of 39 Wh kg–1 with remarkable cycling stability (91.7% of initial capacitance retention after 6000 cycles at 5 A g–1).

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“…The other two satellite peaks are ascribed to Co 2p 3/2 and Co 2p 1/2 signals. The single peak in Figure d of Al 2p indicates the Al 3+ species (Al–O) …”

Section: Results and Discussionmentioning

confidence: 99%

“…The single peak in Figure 3d of Al 2p indicates the Al 3+ species (Al−O). 40 Electrochemical Performances of NiCo 2 -OH and NiCo 2 Al x -LDHs Electrodes. The CV, GCD, and EIS tests were carried out in a standard three-electrode system to get further understanding of the electrochemical properties of the samples.…”

Section: Acs Applied Energy Materialsmentioning

confidence: 99%

Facile Preparation and Performances of Ni, Co, and Al Layered Double Hydroxides for Application in High-Performance Asymmetric Supercapacitors

Chen

Ouyang

Yang

et al. 2021

ACS Appl. Energy Mater.

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“…The co-precipitation and ion exchange are the most applied methods to synthesise LDH [ 16 , 17 ]. Nonetheless, the hydrothermal and solvothermal methods are currently also being applied [ 18 , 19 , 20 ]. Almost all the LDH materials, regardless of the targeted application, undergo the washing stage after the reaction is completed [ 4 , 5 , 9 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Impact of the Washing Steps of Layered Double Hydroxides (LDH) on the Electrochemical Performance

et al. 2022

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The washing of layered double hydroxides (LDH) material is mostly purposed to discard the unreacted products after the reaction has been completed. However, this study demonstrated that the washing stage can also be targeted to optimise the electrochemical performance of LDH by using an appropriate solvent. Solvents, namely, ethanol, acetone, and an ethanol–acetone solution (2:1) were used for the washing of LDH and the impacts thereof on the structural, physical, chemical, morphological, and electrochemical properties were investigated. Using Williamson–Hall analysis, we observed modifications on the crystalline domain. The specific surface area and pore parameters for all the samples were also differently affected. The Fourier transform infrared (FTIR) measurements displayed evident changes in the basic sites. The electrochemical performances of samples were analysed. The sample washed with the ethanol–acetone solution exhibited a specific capacitance of 1807.26 Fg−1 at 10 mVs−1, which is higher than that of other samples as well as low internal resistance compared to its counterpart. This demonstrates that the use of an appropriate solvent during the washing stage of LDH affects the electrochemical properties.

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“…The electrode fabrication stage is one of the major steps in the development of technological devices, such as supercapacitors and batteries [ 1 , 2 ]. It generally includes three main steps, such as (1) the mixture of the active material, conductive additive and binder with consideration to the ratio of each component into a solvent to make the slurry [ 3 ]; (2) the coating/casting/dropping of the slurry onto a selected substrate; and (3) the drying of the as-prepared electrode at a selected temperature and time [ 4 , 5 ]. Normally, binders are involved during the fabrication of electrodes for adhesive purposes.…”

Section: Introductionmentioning

confidence: 99%

“…Several LDH materials have recently been directly synthesized on nickel foam and applied as binder-free electrodes for supercapacitor applications. However, the majority of them were hydrothermally fabricated [ 4 , 7 , 8 , 23 , 24 , 25 ]. This shows how the current fabrication process of nickel foam-based binder-free LDH electrodes do not accommodate LDH materials synthesized through other methods such as the co-precipitation and ion exchange; whereas the latter are the most used techniques to prepare LDH materials [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Advantage of Dimethyl Sulfoxide in the Fabrication of Binder-Free Layered Double Hydroxides Electrodes: Impacts of Physical Parameters on the Crystalline Domain and Electrochemical Performance

Nyongombe

Kabongo

Noto

et al. 2022

IJMS

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The electrode fabrication stage is a crucial step in the design of supercapacitors. The latter involves the binder generally for adhesive purposes. The binder is electrochemically dormant and has weak interactions, leading to isolating the active material and conductive additive and then compromising the electrochemical performance. Designing binder-free electrodes is a practical way to improve the electrochemical performance of supercapacitors. However, most of the methods developed for the fabrication of binder-free LDH electrodes do not accommodate LDH materials prepared via the co-precipitation or ions exchange routes. Herein, we developed a novel method to fabricate binder-free LDH electrodes which accommodates LDH materials from other synthesis routes. The induced impacts of various physical parameters such as the temperature and time applied during the fabrication process on the crystalline domain and electrochemical performances of all the binder-free LDH electrodes were studied. The electrochemical analysis showed that the electrode prepared at 200 °C-1 h exhibited the best electrochemical performance compared to its counterparts. A specific capacitance of 3050.95 Fg−1 at 10 mVs−1 was achieved by it, while its Rct value was 0.68 Ω. Moreover, it retained 97% of capacitance after 5000 cycles at 120 mVs−1. The XRD and FTIR studies demonstrated that its excellent electrochemical performance was due to its crystalline domain which had held an important amount of water than other electrodes. The as-developed method proved to be reliable and advantageous due to its simplicity and cost-effectiveness.

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One-step growth of NiCoAl layered double hydroxides microspheres toward high energy density supercapacitors

Cited by 27 publications

References 42 publications

Facile Preparation and Performances of Ni, Co, and Al Layered Double Hydroxides for Application in High-Performance Asymmetric Supercapacitors

Facile Preparation and Performances of Ni, Co, and Al Layered Double Hydroxides for Application in High-Performance Asymmetric Supercapacitors

Investigating the Impact of the Washing Steps of Layered Double Hydroxides (LDH) on the Electrochemical Performance

Advantage of Dimethyl Sulfoxide in the Fabrication of Binder-Free Layered Double Hydroxides Electrodes: Impacts of Physical Parameters on the Crystalline Domain and Electrochemical Performance

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