Core-shell nanowires of NiCo2O4@α-Co(OH)2 on Ni foam with enhanced performances for supercapacitors

Wang, W.D.; Zhang, P.P.; Gao, S.Q.; Wang, B.Q.; Wang, X.C.; Li, Ming; Liu, F.; Cheng, J.P.

doi:10.1016/j.jcis.2020.06.048

Cited by 72 publications

(23 citation statements)

References 63 publications

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“…[ 1–8 ] These systems attract a lot of attention largely due to the shown promise of creating composite electrode materials for supercapacitors (SCs) with high functional characteristics. [ 9–19 ] Majority of works focuses on the composites obtained from highly porous carbon matrices with highly developed mesoporosity and specific surface area. Research efforts have been aimed at achieving the highest possible functional parameters (stored electrical capacitance, its stability during multiple potential cycling, charging rate, etc.)…”

Section: Introductionmentioning

confidence: 99%

Multiwalled Carbon Nanotubes: Matrix Nanostructured Composites as Electrode Materials for Supercapacitors

et al. 2021

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Herein, nanostructured composites (NSCs) based on multiwalled carbon nanotubes (MWCNTs) filled with the individual (IH) and mixed (MH) Ni/Co hydroxides nanoparticles are prepared and an influence of NSC morphology and texture on their electrical capacitance is considered. It is found that MWCNTs have a channel diameter (2−5 nm), external diameter (18−23 nm), and wall width (2−12 nm). In NSCs obtained by precipitation of hydroxides from chloride aqueous solutions in an alkaline medium, the filler particles are formed as nanocrystallites inside the channels as well as aggregates composed of crystallites (up to 10 nm in size) situated on the external MWCNT surface. These aggregates look like islands, 15−16 nm wide, and are at least 200 nm long. Functionalization via ozonation causes nontrivial effects of an increase in the size and anisometry of the MH crystallites. The dependence of the NSC electrical capacitance on the content of fillers appears to be extreme. The content in the range of 5−10 wt% which allows increasing the capacitance by 1.2 and 1.5 times as compared with that for MWCNTs is optimal for scanning rates of 80 and 10 mV s−1, respectively.

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Section: Introductionmentioning

confidence: 99%

Multiwalled Carbon Nanotubes: Matrix Nanostructured Composites as Electrode Materials for Supercapacitors

et al. 2021

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“…Shim et al prepared CoMoO 4 @NiCo 2 S 4 core–shell nanostructured materials on the surface of NF, which reflected the desirable performance with a capacitance of 2433 F/g. Similarly, Cheng et al fabricated NiCo 2 O 4 /α-Co(OH) 2 core–shell nanoarrays on the NF, which indicated satisfactory performance with a capacitance of 1298 F/g. However, it remains a severe challenge for core–shell nanomaterials that can be applied for industrial and practical utilizations, and therefore many types of research have been performed to obtain commercial demands.…”

Section: Introductionmentioning

confidence: 99%

Zn–Ni–Se@NiCo₂S₄ Core–Shell Architectures: A Highly Efficient Positive Electrode for Hybrid Supercapacitors

2020

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To meet the demand for the prominent electrode materials having a battery-like nature for hybrid supercapacitors, the suitable designs of promising core–shell structures are greatly needed. Herein, hierarchical Zn–Ni–Se@NiCo2S4 nanoarchitectures on the surface of nickel foam (ZNSe@NCS@NF) as a highly efficient cathode electrode are successfully prepared using a hydrothermal and selenization technique for NiZnSe nanowires and an electrodeposition strategy for NiCo2S4 nanosheets. Field emission scanning electron microscopy images demonstrate that the core one-dimensional ZNSe and shell two-dimensional NCS are interconnected to form a three-dimensional hierarchical and porous ZNSe@NCS nanoarchitecture, leading to the efficient and fast transfer/transmission of both electrons and electrolyte ions. In a three-electrode cell, the ZNSe@NCS@NF electrode acquires excellent capacity (393.7 mAh g–1/1417.3 C g–1 at 1 A g–1), considerable rate performance (maintaining 79.25% at 24 A g–1), and an amazing durability (maintaining 95.5% after 10 000 cycles at 24 A g–1), which are superior to the ZNSe@NF electrode. Besides, the sandwiched hybrid device using ZNSe@NCS@NF as an attractive cathode electrode and activated carbon@nickel foam (AC@NF) as an anode electrode represents the notable capacity of 65.42 mAh g–1, desirable rate performance of 69.15% at 24 A g–1, desirable life span (93.3% capacity retention after 10 000 cycles at 18 A g–1), and promising energy density of 52.37 Wh kg–1 at 800.5 W kg–1. The present synthesis protocol offers a meritorious reference for the fabrication of other kinds of metal selenide/sulfide electrode materials with core–shell structures for various applications.

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“…The O 1s spectrum shown in Figure 4 c is deconvoluted into two peaks at 531.6 eV and 533.1 eV. The peak at 531.6 eV can be attributed to -OH, and another peak at 533.1 eV can be attributed to NiCO 3 and H 2 O [ 40 , 41 , 42 ]. The high-resolution Ni 2p spectrum ( Figure 4 d) is well fitted with a couple of peaks at 856.2 and 873.8 eV, which are ascribed to Ni 2p3/2 and Ni 2p1/2, respectively [ 43 ].…”

Section: Resultsmentioning

confidence: 99%

Standing and Lying Ni(OH)2 Nanosheets on Multilayer Graphene for High-Performance Supercapacitors

Tang

et al. 2021

Nanomaterials

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For conventional synthesis of Ni(OH)2/graphene hybrids, oxygen-containing functional groups should be firstly introduced on graphene to serve as active sites for the anchoring of Ni(OH)2. In this work, a method for growing Ni(OH)2 nanosheets on multilayer graphene (MLG) with molecular connection is developed which does not need any pre-activation treatments. Moreover, Ni(OH)2 nanosheets can be controlled to stand or lie on the surface of MLG. The prepared hybrids were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The growth processes are suggested according to their morphologies at different growth stages. The enhanced electrochemical performances as supercapacitor electrode materials were confirmed by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) techniques. Ni(OH)2 nanosheets standing and lying on MLG show specific capacities of 204.4 mAh g−1 and 131.7 mAh g−1, respectively, at 1 A g−1 based on the total mass of the hybrids and 81.5% and 92.8% capacity retention at a high current density of 10 A g−1, respectively. Hybrid supercapacitors with as-prepared hybrids as cathodes and activated carbon as anode were fabricated and tested.

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Core-shell nanowires of NiCo2O4@α-Co(OH)2 on Ni foam with enhanced performances for supercapacitors

Cited by 72 publications

References 63 publications

Multiwalled Carbon Nanotubes: Matrix Nanostructured Composites as Electrode Materials for Supercapacitors

Multiwalled Carbon Nanotubes: Matrix Nanostructured Composites as Electrode Materials for Supercapacitors

Zn–Ni–Se@NiCo₂S₄ Core–Shell Architectures: A Highly Efficient Positive Electrode for Hybrid Supercapacitors

Standing and Lying Ni(OH)2 Nanosheets on Multilayer Graphene for High-Performance Supercapacitors

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Core-shell nanowires of NiCo2O4@α-Co(OH)2 on Ni foam with enhanced performances for supercapacitors

Cited by 72 publications

References 63 publications

Multiwalled Carbon Nanotubes: Matrix Nanostructured Composites as Electrode Materials for Supercapacitors

Multiwalled Carbon Nanotubes: Matrix Nanostructured Composites as Electrode Materials for Supercapacitors

Zn–Ni–Se@NiCo2S4 Core–Shell Architectures: A Highly Efficient Positive Electrode for Hybrid Supercapacitors

Standing and Lying Ni(OH)2 Nanosheets on Multilayer Graphene for High-Performance Supercapacitors

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Zn–Ni–Se@NiCo₂S₄ Core–Shell Architectures: A Highly Efficient Positive Electrode for Hybrid Supercapacitors