Synergistically Active NiCo<sub>2</sub>S<sub>4</sub> Nanoparticles Coupled with Holey Defect Graphene Hydrogel for High‐Performance Solid‐State Supercapacitors

Tiruneh, Sintayehu Nibret; Kang, Bong Kyun; Kwag, Sung Hoon; Lee, Young-Hun; Kim, Min-Seob; Yoon, Dae Ho

doi:10.1002/chem.201705445

Cited by 68 publications

(23 citation statements)

References 31 publications

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“…The improved specific capacity and rate performance of the N,S-CQDs/NiCo 2 S 4 electrode originate from the positive synergistic effect between highly conductive N,S-CQDs with the capacitive feature and high-capacity NiCo 2 S 4 with Faradaic characteristic. Note that the specific capacity and rate performance of the as-obtained N,S-CQDs/NiCo 2 S 4 composite are comparable or even higher than those of nickel cobalt sulfide-based composite as reported in the literature [46][47][48][49][50][51][52][53]. The cycling property of the NiCo 2 S 4 and N,S-CQDs/NiCo 2 S 4 electrodes was surveyed by the repeated GCD tests at 5 A g −1 in the potential range of 0-0.5 V over 5000 cycles, as exhibited in Fig.…”

Section: Physicochemical and Electrochemical Characterizations Of Thesupporting

confidence: 65%

Graphitic Carbon Quantum Dots Modified Nickel Cobalt Sulfide as Cathode Materials for Alkaline Aqueous Batteries

et al. 2020

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HIGHLIGHTS • The scalable graphitic carbon quantum dots (CQDs) are obtained with a high yield of more than 50%. • The CQDs are utilized to synthesize novel NS-CQDs/NiCo 2 S 4 composite which shows enhanced electrochemical properties. • The assembled novel alkaline aqueous battery delivers superior electrochemical performances. ABSTRACT Carbon quantum dots (CQDs) as a new class of emerging materials have gradually drawn researchers' concern in recent years. In this work, the graphitic CQDs are prepared through a scalable approach, achieving a high yield with more than 50%. The obtained CQDs are further used as structure-directing and conductive agents to synthesize novel N,S-CQDs/ NiCo 2 S 4 composite cathode materials, manifesting the enhanced electrochemical properties resulted from the synergistic effect of highly conductive N,S-codoped CQDs offering fast electronic transport and unique micro-/nanostructured NiCo 2 S 4 microspheres with Faradaic redox characteristic contributing large capacity. Moreover, the nitrogen-doped reduced graphene oxide (N-rGO)/Fe 2 O 3 composite anode materials exhibit ultrahigh specific capacity as well as significantly improved rate property and cycle performance originating from the high-capacity prism-like Fe 2 O 3 hexahedrons tightly wrapped by highly conductive N-rGO. A novel alkaline aqueous battery assembled by these materials displays a specific energy (50.2 Wh kg −1), ultrahigh specific power (9.7 kW kg −1) and excellent cycling performance with 91.5% of capacity retention at 3 A g −1 for 5000 cycles. The present research offers a valuable guidance for the exploitation of advanced energy storage devices by the rational design and selection of battery/capacitive composite materials.

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Section: Physicochemical and Electrochemical Characterizations Of Thesupporting

confidence: 65%

Graphitic Carbon Quantum Dots Modified Nickel Cobalt Sulfide as Cathode Materials for Alkaline Aqueous Batteries

et al. 2020

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“…), indicating the presence of Co 2 + and Co 3 + .T he bands located around7 94.7 (2p 1/2 )a nd 779.6 eV (2p 3/2 )a re indexed to Co 3 + ,a nd the peaks at 796.0 (2p 1/2 ) and 780.5 eV (2p 3/2 )a re ascribed to Co 2 + . [18] For the ZnCo 2 O 4 @Ni(OH) 2 sample, the intensity of the peak at 794.7 (2p 1/2 )d ecreased and the peak at 779.6 eV (2p 3/2 )d isappeared, which may be ascribed to the reduction of Co 3 + to form Co(OH) 2 ,a rising from the strong interaction between the Co on the surface of ZnCo 2 O 4 and the OH group of Ni(OH) 2 . [19] The interaction betweent he ZnCo 2 O 4 core and Ni(OH) 2 shell may facilitatet he charge transporti nc ore-shell interface.…”

Section: Resultsmentioning

confidence: 99%

Metal–Organic Framework Templated 3D Hierarchical ZnCo₂O₄@Ni(OH)₂ Core–Shell Nanosheet Arrays for High‐Performance Supercapacitors

Han

Yang

Zhou

et al. 2018

Chemistry A European J

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Designing core-shell electrode materials with desired components and architectures is a promising strategy for boosting electrochemical performance. Here, three-dimensional hierarchical ZnCo O @Ni(OH) core-shell nanosheet arrays have been successfully fabricated on a Ni foam substrate, in which the porous ZnCo O nanosheet "core" as the conductive scaffold was synthesized by a metal-organic framework (MOF)-templated method, and the ultrathin Ni(OH) nanoflakes "shell" with rich active sites were grafted on the ZnCo O nanosheet through a hydrothermal treatment. When directly used as a free-standing electrode for supercapacitor, these hierarchical ZnCo O @Ni(OH) core-shell nanosheet arrays exhibited a high capacitance of 3063.2 mF cm (1021.1 F g ) at the current density of 1 mA cm . This electrode significantly outperformed individual Ni(OH) or ZnCo O nanosheet arrays, benefiting from the robust core-shell arrays on Ni foam with good electrical conductivity and abundant active sites, as well as the synergetic effect between MOF-derived porous ZnCo O "core" and the ultrathin Ni(OH) "shell". Moreover, the assembled ZnCo O @Ni(OH) //activated-carbon asymmetric supercapacitor displayed excellent energy and power densities (maximum of 40.0 Wh kg and 8.02 kW kg ) and superior cycling stability of 98.4 % retention with 91.2 % coulombic efficiency over 5 000 cycles at 10 A g .

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“…As a result, the superior super-capacitive performance of the NCS@NCOH//AC device originates from the following characteristics: (1) The NCS nanosheets enhance the interfacial contact between the electrolyte and the active materials, and they provide abundant active sites for the energy storage properties; (2) the AC@NF negative electrode facilitates ion transport and electrolyte accessibility, leading to a lower resistance. From our experimental achievements, it can be stated that we obtained better results compared to the other reported nickel-cobalt sulfide-based ASCs such as NCS//C ASCs (22.8 Whkg −1 at 160 Wkg −1 ) [30], Co 3 O 4 @MnO 2 //MEGO (17.7 Whkg −1 at 158 Wkg −1 ), PNTs@NCS//PNTs@NCS ASCs (21.3 Whkg −1 at 417 Wkg −1 ) [31], NCS@HGH//NCS@HGH ASCs (21.3 Whkg −1 at 2100 Wkg −1 ) [32], Ni 3 S 2 /MWCNT-NC//AC ASCs (19.8 Whkg −1 at 798 Wkg −1 ) [33], and NiCo LDH//AC ASCs (15.9 Whkg −1 at 400 Wkg −1 ) [34]. Figure 12 shows the Ragone plots of the NCS@NCOH//AC asymmetric supercapacitors attained from the GCD measurements at various CDs.…”

Section: Performance Evaluation Of Asymmetry Supercapacitor Based On mentioning

confidence: 92%

Supercapacitor Performance of Nickel-Cobalt Sulfide Nanotubes Decorated Using Ni Co-Layered Double Hydroxide Nanosheets Grown in Situ on Ni Foam

Chen

Musharavati

et al. 2020

Nanomaterials

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In this study, to fabricate a non-binder electrode, we grew nickel–cobalt sulfide (NCS) nanotubes (NTs) on a Ni foam substrate using a hydrothermal method through a two-step approach, namely in situ growth and an anion-exchange reaction. This was followed by the electrodeposition of double-layered nickel-cobalt hydroxide (NCOH) over a nanotube-coated substrate to fabricate NCOH core-shell nanotubes. The final product is called NCS@NCOH herein. Structural and morphological analyses of the synthesized electrode materials were conducted via SEM and XRD. Different electrodeposition times were selected, including 10, 20, 40, and 80 s. The results indicate that the NCSNTs electrodeposited with NCOH nanosheets for 40 s have the highest specific capacitance (SC), cycling stability (2105 Fg−1 at a current density of 2 Ag−1), and capacitance retention (65.1% after 3,000 cycles), in comparison with those electrodeposited for 10, 20, and 80 s. Furthermore, for practical applications, a device with negative and positive electrodes made of active carbon and NCS@NCOH was fabricated, achieving a high-energy density of 23.73 Whkg−1 at a power density of 400 Wkg−1.

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Synergistically Active NiCo₂S₄ Nanoparticles Coupled with Holey Defect Graphene Hydrogel for High‐Performance Solid‐State Supercapacitors

Cited by 68 publications

References 31 publications

Graphitic Carbon Quantum Dots Modified Nickel Cobalt Sulfide as Cathode Materials for Alkaline Aqueous Batteries

Graphitic Carbon Quantum Dots Modified Nickel Cobalt Sulfide as Cathode Materials for Alkaline Aqueous Batteries

Metal–Organic Framework Templated 3D Hierarchical ZnCo₂O₄@Ni(OH)₂ Core–Shell Nanosheet Arrays for High‐Performance Supercapacitors

Supercapacitor Performance of Nickel-Cobalt Sulfide Nanotubes Decorated Using Ni Co-Layered Double Hydroxide Nanosheets Grown in Situ on Ni Foam

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Synergistically Active NiCo2S4 Nanoparticles Coupled with Holey Defect Graphene Hydrogel for High‐Performance Solid‐State Supercapacitors

Cited by 68 publications

References 31 publications

Graphitic Carbon Quantum Dots Modified Nickel Cobalt Sulfide as Cathode Materials for Alkaline Aqueous Batteries

Graphitic Carbon Quantum Dots Modified Nickel Cobalt Sulfide as Cathode Materials for Alkaline Aqueous Batteries

Metal–Organic Framework Templated 3D Hierarchical ZnCo2O4@Ni(OH)2 Core–Shell Nanosheet Arrays for High‐Performance Supercapacitors

Supercapacitor Performance of Nickel-Cobalt Sulfide Nanotubes Decorated Using Ni Co-Layered Double Hydroxide Nanosheets Grown in Situ on Ni Foam

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Synergistically Active NiCo₂S₄ Nanoparticles Coupled with Holey Defect Graphene Hydrogel for High‐Performance Solid‐State Supercapacitors

Metal–Organic Framework Templated 3D Hierarchical ZnCo₂O₄@Ni(OH)₂ Core–Shell Nanosheet Arrays for High‐Performance Supercapacitors