Unique MOF-derived hierarchical MnO<sub>2</sub> nanotubes@NiCo-LDH/CoS<sub>2</sub> nanocage materials as high performance supercapacitors

Wang, Xiuhua; Huang, Feifei; Fang, Ruiqi; He, Peng; Que, Ronghui; Jiang, San Ping

doi:10.1039/c9ta01951k

Cited by 232 publications

(120 citation statements)

References 63 publications

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“…Even at each current density, the NiCo LDH@NiSe/NF electrode exhibited a maximum areal capacity. The corresponding energy storage performance of our integrated electrode also exceeds those of the previously reported electrodes, such as NiCo 2 Al LDH (237 μAh cm −2 at 0.8 mA cm −2 ), MnO 2 @NiCo LDH/CoS 2 (473 μAh cm −2 at 2 mA cm −2 ), NiCo 2 S 4 @NiCo LDH (631 μAh cm −2 at 2 mA cm −2 ), Co 9 S 8 @PPy@NiCo LDH (368 μAh cm −2 at 1 mA cm −2 ) and many other reports, as presented in Table S2. These excellent electrochemical properties of the NiCo LDH@NiSe/NF are mainly ascribed to the large mass loading, multicomponent synergy and accessible 3D porous network structure.…”

Section: Resultscontrasting

confidence: 46%

“…The Nyquist plots of all electrodes and equivalent electric circuit model are shown in Figure c. The intersection on the real axis at the high‐frequency region is called equivalent series resistance ( R ESR ), which is the sum of ionic resistance of the electrolyte, inherent resistance of the active material and contact resistance at the active material/collector interface . The diameter of the semicircle is closely related to the charge transfer resistance ( R ct ) at the electrode material/electrolyte interface .…”

Section: Resultsmentioning

confidence: 99%

“…Recently, the battery‐type materials (NiO, NiCoP, Ni 3 Se 2 , etc) have received much more attention as the Faradaic charge storage and the diffusion‐controlled nano‐intercalation could obtain greater charge storage capacity . However, the areal mass loading of active materials in most literatures is generally limited within 3 mg cm −2 , resulting in a low areal capacity . Although the researchers can increase the areal loading intentionally, it might cause dramatic decrease in conductivity with dense aggregation of transitional metal compounds.…”

Section: Introductionmentioning

confidence: 99%

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2‐nm‐Thick NiCo LDH@NiSe Single‐Crystal Nanorods Grown on Ni Foam as Integrated Electrode with Enhanced Areal Capacity for Supercapacitors

Zhai

et al. 2020

Batteries & Supercaps

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It remains a great challenge to simultaneously guarantee the conductivity and high areal loading of active materials for integrated electrode of supercapacitors. Herein, we designed a hierarchical structure with cores of NiSe single‐crystal nanorods and sheaths of 2‐nm‐thick NiCo thin sheets grown on nickel foam (NiCo LDH@NiSe/NF) as integrated electrode. It reaches a high areal capacity of 1131 μAh cm−2 at a current density of 5 mA cm−2, which is 2.2 times of NiSe/NF (522 μAh cm−2) and 6.0 times of NiCo LDH/NF (189 μAh cm−2), superior to most reported integrated electrodes. The enhanced areal capacity can be ascribed to the high active material loading of 6.5 mg cm−2 (twice more than other reported values) and considerable conductivity of single‐crystal NiSe nanorods of 2630 S cm−1. The fabricated hierarchical integrated electrode of NiCo LDH@NiSe/NF assembled with activated carbon shows a maximum energy density of 0.454 mWh cm−2 and a maximum power density of 80 mW cm−2. This work presents supports of single‐crystal nanorods for thin LDH sheets to fabricate high‐density hierarchical structure for integrated electrode, which improves the conductivity and structural stability of active materials especially the LDHs, resulting in excellent electrochemical performance. It offers a promising approach to engineer and fabricate advanced supercapacitors with enhanced areal capacity.

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Section: Resultscontrasting

confidence: 46%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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2‐nm‐Thick NiCo LDH@NiSe Single‐Crystal Nanorods Grown on Ni Foam as Integrated Electrode with Enhanced Areal Capacity for Supercapacitors

Zhai

et al. 2020

Batteries & Supercaps

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“…And, the Mn satellite peaks at 645.9 and 655.9 eV sign the presence of the oxidized manganese atoms. [47] While a pair of peaks center at 639.2 and 650.2 eV ascribing to MnC and MnMn bonds, respectively, which confirms the successful formation of Mn 2 Co 2 C alloy. As for the deconvoluted Co 2p spectrum (Figure 6d), there are two sharp peaks at 778.7 and 793.7 eV indexed to CoC and CoCo bonds, which are also belonging to Mn 2 Co 2 C compound.…”

Section: Resultsmentioning

confidence: 63%

Surfactant‐Mediated Morphological Evolution of MnCo Prussian Blue Structures

Wang

Dong

Zhu

et al. 2020

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remains a major challenge. [1,2] In this context, taking advantage of the forces between different molecules and/or atoms, nano-scientists can utilize various complex strategies, such as selfassembly, [3,4] top-down, [5,6] down-top, [7,8] and template methods, [9,10] which can conveniently build complex systems to meet the needs of nanomaterials. [11,12] Crystalline coordination compounds are usually long-range ordered infinite network structures connected by versatile coordination bonds between metal ions and organic ligands, [13,14] which are regarded as one subclass of functional materials with fixed open pores. [15] In addition to the intrinsic features of materials, the properties of coordination compounds depend largely on their structural as well as morphological characteristics. [16,17] Moreover, materials reduced to the nanoscale can exhibit totally different properties compared to what they show on a macroscale, enabling unique applications. [18,19] Therefore, it is vital to develop new strategies to design and precisely control the crystal nanostructures of coordination compounds. [20,21] On the other hand, we need to develop stable modern synthetic approaches and unfold a series of underlying mechanism for preparing nanomaterials with an expected structure as well as morphology, [22,23] rather than obtaining them by chance. However, the chemical reaction is mainly controlled by both kinetics and thermodynamics with multiple components interacting with each other in the reaction process, which would result in a complex process. [24,25] Thus, it is difficult to reveal the change of crystal morphology and explain the principle behind them step by step. [26] As the first modern synthetic pigment, Prussian blue is known for the artificial coordination compound and plenty of literature has shown that its analogues (PBA) exhibit various hollow morphologies. [27] Lou and his group has successfully synthesized CoFe PBA nanocages, nanoframes, and nanoboxes with different 3D geometry through polyvinylpyrrolidone and citrate mediated growth kinetics. [28] However, the formation process and specific steps of their hollow shape are rarely reported. To analyze the real formation mechanism of crystal morphology is of great significance for the development of nanomaterials with expected morphology, which can be widely used in the fields of electrochemical energy storage or catalysis. [29-31] In the preparation of nanomaterials, the kinetics and thermodynamics in the reaction can significantly affect the structures and phases of nanocrystals. Therefore, people are keen to adopt various synthetic strategies to accurately assemble the target nanocrystals, and reveal the underlying mechanism of the formation of specific structures. In this work, the total reaction time is adjusted to let the prepared MnCo Prussian blue analogous (MnCoPBA) crystals show four evolving morphological changes at different stages with the assistance of sodium dodecyl sulfate. Furthermore, it is clearly observed that the epitaxial growth along t...

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“…The binding energy of 164.2 eV corresponds to the S that is bonded with Ni, and another peak at 169.4 eV corresponds to sulfur oxides at the surface. 21 To assess the electrochemical performance of NiS nanosheets, a three-electrode system was employed in 3 M KOH. Fig.…”

Section: Resultsmentioning

confidence: 99%

Ultra-thin NiS nanosheets as advanced electrode for high energy density supercapacitors

et al. 2020

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Unique MOF-derived hierarchical MnO₂ nanotubes@NiCo-LDH/CoS₂ nanocage materials as high performance supercapacitors

Abstract: A new one-dimensional hierarchical hollow MnO2 nanotubes@NiCo-LDH/CoS2 nanocage supercapacitor, MnO2@NiCo-LDH/CoS2, achieves a high specific capacitance and high stability.

Cited by 232 publications

References 63 publications

2‐nm‐Thick NiCo LDH@NiSe Single‐Crystal Nanorods Grown on Ni Foam as Integrated Electrode with Enhanced Areal Capacity for Supercapacitors

2‐nm‐Thick NiCo LDH@NiSe Single‐Crystal Nanorods Grown on Ni Foam as Integrated Electrode with Enhanced Areal Capacity for Supercapacitors

Surfactant‐Mediated Morphological Evolution of MnCo Prussian Blue Structures

Ultra-thin NiS nanosheets as advanced electrode for high energy density supercapacitors

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Unique MOF-derived hierarchical MnO2 nanotubes@NiCo-LDH/CoS2 nanocage materials as high performance supercapacitors

Abstract: A new one-dimensional hierarchical hollow MnO2 nanotubes@NiCo-LDH/CoS2 nanocage supercapacitor, MnO2@NiCo-LDH/CoS2, achieves a high specific capacitance and high stability.

Cited by 232 publications

References 63 publications

2‐nm‐Thick NiCo LDH@NiSe Single‐Crystal Nanorods Grown on Ni Foam as Integrated Electrode with Enhanced Areal Capacity for Supercapacitors

2‐nm‐Thick NiCo LDH@NiSe Single‐Crystal Nanorods Grown on Ni Foam as Integrated Electrode with Enhanced Areal Capacity for Supercapacitors

Surfactant‐Mediated Morphological Evolution of MnCo Prussian Blue Structures

Ultra-thin NiS nanosheets as advanced electrode for high energy density supercapacitors

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Unique MOF-derived hierarchical MnO₂ nanotubes@NiCo-LDH/CoS₂ nanocage materials as high performance supercapacitors