Engineering sulfur vacancies and impurities in NiCo2S4 nanostructures toward optimal supercapacitive performance

Lu, Fei; Zhou, Min; Li, Wanrong; Weng, Qunhong; Li, Cuiling; Xue, Yanming; Jiang, Xiangfen; Zeng, Xianghua; Bando, Yoshio; Golberg, Dmitri

doi:10.1016/j.nanoen.2016.05.042

Cited by 352 publications

(137 citation statements)

References 44 publications

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“…As shown in the high frequency region in Figure , there are no distinct semicircles for the Nyquist plots but the intersection with the real axis in high frequency, which represents the ohmic resistance of the electrode . And the intersection could represent their electronic conductivity ,,,. Clearly, SiW ‐ 2 has the best electrical conductivity in the SiW 12 series of compounds.…”

Section: Resultsmentioning

confidence: 99%

Enhancing Energy Storage via TEA‐Dependent Controlled Syntheses: Two Series of Polyoxometalate‐Based Inorganic‐Organic Hybrids and their Supercapacitor Properties

et al. 2018

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To enhance energy storage performance via modulation of crystal structure on the molecular level, two series of triethylamine (TEA)‐dependent polyoxometalate (POM) based inorganic‐organic hybrid compounds, [CuII(btx)2]2[SiW12O40] (SiW‐1), [CuI(btx)]4[SiW12O40] (SiW‐2), [CuI4(btx)3][SiW12O40] ⋅ 2H2O (SiW‐3), [{CuII6(btx)7(H2O)12}H4⊂(W12O40)2] ⋅ 12H2O (W‐1), [{CuII7(btx)8(H2O)10}H2⊂(W12O40)2] ⋅ 2H2O (W‐2) and [{CuII10CuI2(btx)11(H2O)16}H2⊂(W12O40)3] ⋅ 6H2O (W‐3) (btx=1,4‐bis(triazol‐1‐ylmethyl)benzene) have been synthesized and explored as pseudocapacitor electrode materials. Compared to other compounds, SiW‐2 shows a specific capacitance of 110.3 F g−1 at 3.0 A g−1 and only experiences a capacitance loss of 13 % after 1000 cycles at a current density of 18.0 A g−1. More importantly, the two series of compounds can be considered as a model for studying the effects of the molecular structures on the pseudocapacitor performance. The result verifies that besides the type of POM, the capacitance ability of the POM‐based compounds is mainly dominated by the connecting modes of adjacent POM building blocks and the dimension of covalent networks formed by POM building blocks. Thus, this work may open a new avenue to optimize the performance of POM‐based capacitors.

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Section: Resultsmentioning

confidence: 99%

Enhancing Energy Storage via TEA‐Dependent Controlled Syntheses: Two Series of Polyoxometalate‐Based Inorganic‐Organic Hybrids and their Supercapacitor Properties

et al. 2018

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“…NiCo 2 S 4 only has a pair of redox peaks for Ni 2+ /Ni 3+ and Co 3+ /Co 4+ in the CV curves, whereas the composite not only provides a distinct pair of redox peaks for Ni 2+ /Ni 3+ and Co 3+ /Co 4+ , but also possesses a weak cathodic peak for Co 3+ /Co 2+ at 0.32 V during the negative sweep, indicating the pseudocapacitance nature of NiCo 2 S 4 in the charge/discharge process; the appearance of more redox peaks may result from the interaction between NiCo 2 S 4 and carbon substrate. The corresponding redox reactions are shown in Equations :

true NiCo_{2} normalS_{4} + OH^{-} + normalH_{2} normalO \leftrightarrow NiS_{4 - 4 x} OH + 2 CoS_{2 x} OH + 2 normale^{-}

true CoS_{2 x} OH + OH^{-} \leftrightarrow CoS_{2 x} normalO + normalH_{2} normalO + normale^{-}

…”

Section: Resultsmentioning

confidence: 99%

A Hollow Tube‐on‐Tube Architecture of Carbon‐Tube‐Supported Nickel Cobalt Sulfide Nanotubes for Advanced Supercapacitors

Wang

Cui

et al. 2017

ChemNanoMat

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The nanotube structure has unique advantages, such as a large electroactive surface area and shorter diffusion pathway for ions/electrons for energy storage. In this paper, we fabricated a novel supercapacitor electrode material based on a composite material with a hollow tube‐on‐tube architecture. This architecture, which was derived from the sustainable Juncus roemerianus, consisted of nickel cobalt sulfide nanotubes coating the exterior and interior of carbon tubes. The obtained hollow tube‐on‐tube structure is similar to a reservoir, in which ions/electrons can diffuse via a bi‐directional method and supply and transfer to the carbon tube interface. Consequently, this structure can probably provide more electrochemically active sites for its application in high‐performance asymmetric supercapacitors (ASCs). The assembled ASC device also presents superior specific capacitance (83 F g−1 at the current density of 0.5 A g−1), high energy density (27.7 Wh kg−1 at a power density of 263.6 W kg−1), and good cycling stability (72.23 % capacitance retention after 3000 cycles). Therefore, the NiCo2S4/bio‐carbon electrode with hollow tube‐on‐tube structure is not only a promising electrode material, but also can be applicable to energy storage and conversion devices.

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“…Among the metal oxides/hydroxides, iron oxide (Fe 3 O 4 ) is a promising anode for ASCs, due to its remarkable benefits of high theoretical capacity (≈926 mA g −1 ), wide operational potential window (−1.2 to 0.25 V), excellent electrical conductivity (102−103 S cm −1 ), cost‐effectiveness, and biocompatibility . Doping of different metal ions is generally considered a strategy to enhance the electrochemical performance of functional nanomaterials, because the aliovalent metal tends to occupy the sites in the crystalline structure, which could be a beneficial phenomenon to boost the electrochemical performance of electrode materials . For example, titanium‐doped Fe 2 O 3 showed better electrochemical performance than pure Fe 2 O 3 ‐based electrode.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical 3D Cobalt‐Doped Fe₃O₄ Nanospheres@NG Hybrid as an Advanced Anode Material for High‐Performance Asymmetric Supercapacitors

Guo

Balamurugan

et al. 2017

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Hierarchical nanostructure, high electrical conductivity, extraordinary specific surface area, and unique porous architecture are essential properties in energy storage and conversion studies. A new type of hierarchical 3D cobalt encapsulated Fe O nanosphere is successfully developed on N-graphene sheet (Co-Fe O NS@NG) hybrid with unique nanostructure by simple, scalable, and efficient solvothermal technique. When applied as an electrode material for supercapacitors, hierarchical Co-Fe O NS@NG hybrid shows an ultrahigh specific capacitance (775 F g at a current density of 1 A g ) with exceptional rate capability (475 F g at current density of 50 A g ), and admirable cycling performance (97.1% capacitance retention after 10 000 cycles). Furthermore, the fabricated Co-Fe O NS@NG//CoMnO @NG asymmetric supercapacitor (ASC) device exhibits a high energy density of 89.1 Wh kg at power density of 0.901 kW kg , and outstanding cycling performance (89.3% capacitance retention after 10 000 cycles). Such eminent electrochemical properties of the Co-Fe O NS@NG are due to the high electrical conductivity, ultrahigh surface area, and unique porous architecture. This research first proposes hierarchical Co-Fe O NS@NG hybrid as an ultrafast charge-discharge anode material for the ASC device, that holds great potential for the development of high-performance energy storage devices.

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Engineering sulfur vacancies and impurities in NiCo2S4 nanostructures toward optimal supercapacitive performance

Cited by 352 publications

References 44 publications

Enhancing Energy Storage via TEA‐Dependent Controlled Syntheses: Two Series of Polyoxometalate‐Based Inorganic‐Organic Hybrids and their Supercapacitor Properties

Enhancing Energy Storage via TEA‐Dependent Controlled Syntheses: Two Series of Polyoxometalate‐Based Inorganic‐Organic Hybrids and their Supercapacitor Properties

A Hollow Tube‐on‐Tube Architecture of Carbon‐Tube‐Supported Nickel Cobalt Sulfide Nanotubes for Advanced Supercapacitors

Hierarchical 3D Cobalt‐Doped Fe₃O₄ Nanospheres@NG Hybrid as an Advanced Anode Material for High‐Performance Asymmetric Supercapacitors

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Engineering sulfur vacancies and impurities in NiCo2S4 nanostructures toward optimal supercapacitive performance

Cited by 352 publications

References 44 publications

Enhancing Energy Storage via TEA‐Dependent Controlled Syntheses: Two Series of Polyoxometalate‐Based Inorganic‐Organic Hybrids and their Supercapacitor Properties

Enhancing Energy Storage via TEA‐Dependent Controlled Syntheses: Two Series of Polyoxometalate‐Based Inorganic‐Organic Hybrids and their Supercapacitor Properties

A Hollow Tube‐on‐Tube Architecture of Carbon‐Tube‐Supported Nickel Cobalt Sulfide Nanotubes for Advanced Supercapacitors

Hierarchical 3D Cobalt‐Doped Fe3O4 Nanospheres@NG Hybrid as an Advanced Anode Material for High‐Performance Asymmetric Supercapacitors

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Hierarchical 3D Cobalt‐Doped Fe₃O₄ Nanospheres@NG Hybrid as an Advanced Anode Material for High‐Performance Asymmetric Supercapacitors