Facile preparation of flower-like NiMn layered double hydroxide/reduced graphene oxide microsphere composite for high-performance asymmetric supercapacitors

Huang, Long; Liu, Bingchuan; Hou, Huijie; Wu, Longsheng; Zhu, Xiaolei; Hu, Jingping; Yang, Jiakuan

doi:10.1016/j.jallcom.2017.09.195

Cited by 105 publications

(45 citation statements)

References 63 publications

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“…When hydroxyl act as weak field ligands, Mn 3 + are in the high spin state, which leading to instability of NiMn LDH, Mn 3 + are easily oxidized to Mn 4 + , we can also observe that the characteristic peak of Mn 4 + exists at 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 around 647 eV. [28,[35][36][37] Additionally, the EDS mapping of UNML nanosheets ( Figure S2a-d) shows the homogeneous distribution of Ni, Mn and O elements.…”

Section: Resultsmentioning

confidence: 69%

One‐Step Synthesis of Ultrathin NiMn Layered Double Hydroxide Nanosheets for Supercapacitors

et al. 2019

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With the help of ethylenediamine (EN), we built through hydrothermal synthesis a multiple‐level NiMn layered double hydroxide nanostructure consisting of ultrathin nanosheets (UNML) with plenty buffer spaces. Such porous structure provides more active sites, shortens the diffusion path of electrolyte ions, and creates massive “live volume” to ensure structural integrity during long‐term cycling. The UNML possesses high specific capacitance (1513 F g−1 at 1 A g−1). Moreover, the hybrid supercapacitor employing UNML and AC as positive and negative electrode delivers enhanced energy density up to 59 Wh kg−1 at a power density of 808 W kg−1 and robust cycling stability with capacitance degradation of 8.7 % after 5000 cycles. This simple strategy is expected to cope with the prevalent issues facing battery‐type electrode materials, ensuring improvement of the overall electrochemical performance.

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Section: Resultsmentioning

confidence: 69%

One‐Step Synthesis of Ultrathin NiMn Layered Double Hydroxide Nanosheets for Supercapacitors

et al. 2019

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“…Meanwhile, hexamethylenetetramine could also be used to prepare NiMn LDHs grown on Ni foam by hydrothermal process at 90 °C for 6 h [ 36 ]. In addition to the reactions in aqueous solutions, a mixture solution containing deionized water and ethanol can be used, as reported by Huang et al [ 37 ]. Similar to co-precipitation method, Chang et al found that ammonium peroxodisulfate oxidized Mn 2+ ions into Mn 3+ ones during the hydrothermal process and it played an important role for the generation of Ni(II)Mn(III) CO 3 2− LDHs [ 38 ].…”

Section: The Synthesis Methods Of Nimn Ldhsmentioning

confidence: 99%

“…For carbon materials, the capacitance primarily comes from an electrical double-layer mechanism without the Faradaic reactions from NiMn LDH. For example, Huang et al simply compared the electrochemical performances of NiMn LDH/rGO composites with different rGO contents, where the composites exhibited higher specific capacitance and better rate capability than pristine NiMn LDH [ 37 ]. In this section, we review the reports on NiMn LDH composites for the electrode materials of SCs.…”

Section: Electrochemical Performances Of Nimn Ldh-based Electrode mentioning

confidence: 99%

Research Progress of NiMn Layered Double Hydroxides for Supercapacitors: A Review

2018

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The research on supercapacitors has been attractive due to their large power density, fast charge/discharge speed and long lifespan. The electrode materials for supercapacitors are thus intensively investigated to improve the electrochemical performances. Various transition metal layered double hydroxides (LDHs) with a hydrotalcite-like structure have been developed to be promising electrode materials. Earth-abundant metal hydroxides are very suitable electrode materials due to the low cost and high specific capacity. This is a review paper on NiMn LDHs for supercapacitor application. We focus particularly on the recent published papers using NiMn LDHs as electrode materials for supercapacitors. The preparation methods for NiMn LDHs are introduced first. Then, the structural design and chemical modification of NiMn LDH materials, as well as the composites and films derived from NiMn LDHs are discussed. These approaches are proven to be effective to enhance the performance of supercapacitor. Finally, the reports related to NiMn LDH-based asymmetric supercapacitors are summarized. A brief discussion of the future development of NiMn LDHs is also provided.

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“…The volume and distribution of the nanoflowers collections increased with increasing the amount of GO to be more tangled in the Zn-Al-GO1, while Zn-Al-GO2 was more dispersive. Consequently, the detailed features of the Zn-Al-GO could be tuned by the concentrations of GO used in the preparation process, which may control the morphology of the LDH nanoflakes [40], noting that the prepared graphene had plate-like morphology as shown in Figure 7e,f.…”

Section: Morphological Studymentioning

confidence: 99%

Designing Dual-Function Nanostructures for Water Purification in Sunlight

Saber

Mahfoz-Kotb

2020

Applied Sciences

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The current study aims at combining two building blocks together into well-designed nanostructures to act as dual-function materials; active photocatalysts in sunlight and effective adsorbents for increasing the efficiency of water purification. By these nanostructures, we could avoid the drawbacks of the existing technologies for water purification and remove the industrial pollutants by a dual process; adsorption and photocatalytic degradation. In this trend, Zn-Al layered double hydroxides (LDHs) are combined with graphene oxide to produce a series of nanolayered structures. These nanolayered structures are effective for converting Zn-Al LDHs to be photo-active in sunlight through decreasing its band gap energy from 5.5 eV to 2.5 eV. In addition, these nanolayered structures caused complete decolorization and mineralization of green dyes in sunlight through accelerating the reaction rate of the photocatalytic degradation of dyes seven times higher than that of the pure Zn-Al LDHs. In the same time, they improved the adsorption process of green dyes through creating new micro- and meso-porous structures and high surface area for Zn-Al LDHs. Finally, the well-designed nanostructures between Zn-Al LDHs and graphene oxide led to converting non-photoactive materials to be active in the visible light in addition to a complete and fast removal for organic pollutants.

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Facile preparation of flower-like NiMn layered double hydroxide/reduced graphene oxide microsphere composite for high-performance asymmetric supercapacitors

Cited by 105 publications

References 63 publications

One‐Step Synthesis of Ultrathin NiMn Layered Double Hydroxide Nanosheets for Supercapacitors

One‐Step Synthesis of Ultrathin NiMn Layered Double Hydroxide Nanosheets for Supercapacitors

Research Progress of NiMn Layered Double Hydroxides for Supercapacitors: A Review

Designing Dual-Function Nanostructures for Water Purification in Sunlight

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