Synthesis of three-dimensional self-standing graphene/Ni(OH)<sub>2</sub> composites for high-performance supercapacitors

Jiang, Chunhui; Zhan, Beibei; Li, Chen; Huang, Wei; Dong, Xiaochen

doi:10.1039/c4ra00916a

Cited by 29 publications

(11 citation statements)

References 45 publications

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“…Ni(III) (for example, curve 1 at * 440 mV) and the reduction reaction Ni(III) ? Ni(II) (for example, curve 1 at * 270 mV), which is in agreement with the results obtained by other authors for similar composites [42,43].…”

Section: Electrochemical Testssupporting

confidence: 93%

Influence of the content on properties of microwave-exfoliated graphite oxide and Ni(OH)2 composites

et al. 2016

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Composites of Ni(OH) 2 and microwave-exfoliated graphite oxide (MEGO) with component ratios of 20:80, 35:65, and 50:50 have been synthesized by treating a water mixture of MEGO with NiSO 4 9 7H 2 O in a KOH solution. The structure and properties of the composites obtained have been studied using IR spectroscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy. MEGO is known to possess high stability during the charge-discharge process and relatively low specific capacitance. On the contrary, Ni(OH) 2 possesses a high specific capacitance and a low stability during the charge-discharge process. Our experimental results show that the addition of MEGO to Ni(OH) 2 increases the stability of the composite electrode under a charge-discharge process. Some increase in the specific capacitance during the cycling have been observed for the composites with the 35:65 and 50:50 ratios. Moreover, the specific capacitance of the 35:65 composite matches the specific capacitance of pure Ni(OH) 2 after 100 cycles.

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Section: Electrochemical Testssupporting

confidence: 93%

Influence of the content on properties of microwave-exfoliated graphite oxide and Ni(OH)2 composites

et al. 2016

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“…However, graphene electrodes are limited due to the re-stacking problem caused by the strong π-π interaction and Van der Waals forces between their sheets, resulting in non-desirables properties like loss of exposed surface area, loss of the electric conductivity, and inferior ion accessibility. It is therefore crucial to fabricate a reduced graphene structure (RGO) which keeps the suitability of the material to avoid any possible limitation [22,23].…”

Section: Introductionmentioning

confidence: 99%

Electrophoretic deposition of RGO-NiO core-shell nanostructures driven by heterocoagulation method with high electrochemical performance

Yus

Bravo

Sánchez-Herencia

et al. 2019

Electrochimica Acta

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A heterocoagulation route is proposed to prepare Reduced Graphene Oxide-Nickel Oxide (RGO/NiO) hybrid structures for their application as supercapacitor electrodes. The RGO intercalation among the NiO nanoplatelets was carried out by electrostatic interactions of the synthetized particles which were previously dispersed and stabilized in aqueous media to improve the assembly between both materials forming core-shell structures. The electrophoretic deposition (EPD) was used to shape the composite onto 3D collector (Ni foams) controlling their growth and homogeneity. Electrodes were thermal treated at 325ºC during 1 h to improve the electrochemical response since the formation of ceramic necks among NiO semiconductor nanoparticles preserve the microstructural integrity avoiding the employment of binders to enhance their connectivity, while RGO contributes with the electrochemical double layer effect to step up the specific capacitance by reducing the charge transfer resistance. FESEM results confirmed that RGO nanosheets were full-covered by the NiO nanoplatelets and suggested that ~1mg of the electroactive composite homogeneously covers the Ni foam and it is the optimum among of electroactive material to avoid microstructural defects that produce ohmic drops limiting the capacitance. The electrochemical characterization of the resulting binder-free RGO/NiO electrodes was compared with the bare-NiO electrode. The hybrid composite exhibited excellent performance with a high specific capacitance of 940 Fg -1 at 2Ag -1 and a higher rate capability.

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“…[8][9][10] Although the conductivity of transition metal sulfides is better than that of their oxide counterparts, their capacitance performance is still limited. Recently, much research about composites of carbon/ oxide, [11][12][13] carbon/hydroxide [14][15][16] has been done, and the results indicate that the combination of the two types of materials can greatly improve the supercapacitor performance. As is known, nitrogen-doping (N-doping) is of vital importance for enhancing electrochemical performance of supercapacitors because the lone electron pairs of the nitrogen atoms can provide additional negative charges in the carbon networks.…”

Section: Introductionmentioning

confidence: 99%

N-doped carbon coated hollow Ni_xCo_9−xS₈urchins for a high performance supercapacitor

et al. 2015

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N-doped carbon coated NixCo9-xS8 (NixCo9-xS8@C) hollow urchins have been synthesized via a two-step solvothermal synthesis and an in situ polymerization in dopamine together with a post-annealing process. The characterization indicated that NixCo9-xS8@C hollow urchins have urchin-like morphology and a uniform size distribution. Furthermore, there is a complete phrase transformation from the as obtained NiCo2S4/NixCo9-xS8 hybrid to NixCo9-xS8 during the thermal annealing process. More importantly, as electrochemical materials, NixCo9-xS8@C has a high specific capacitance (1404.0 F g(-1) at 2.0 A g(-1)) and excellent cycling performance (95.8% capacitance retention of the highest value after 2000 cycles). These results can be attributed to the coating of N-doped carbon, which gives the composite good conductivity. Additionally, the phase transformation from NiCo2S4/NixCo9-xS8 to NixCo9-xS8 during the thermal annealing greatly enhanced the redox reaction of the Co and Ni species.

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Synthesis of three-dimensional self-standing graphene/Ni(OH)₂ composites for high-performance supercapacitors

Abstract: Using surface active agents, three-dimensional (3D) self-standing graphene/Ni(OH)2 composites with different morphologies, such as nanoflowers, nanoslices and nanoparticles, are directly synthesized by a facile in situ electrodeposition method.

Cited by 29 publications

References 45 publications

Influence of the content on properties of microwave-exfoliated graphite oxide and Ni(OH)2 composites

Influence of the content on properties of microwave-exfoliated graphite oxide and Ni(OH)2 composites

Electrophoretic deposition of RGO-NiO core-shell nanostructures driven by heterocoagulation method with high electrochemical performance

N-doped carbon coated hollow Ni_xCo_9−xS₈urchins for a high performance supercapacitor

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Synthesis of three-dimensional self-standing graphene/Ni(OH)2 composites for high-performance supercapacitors

Abstract: Using surface active agents, three-dimensional (3D) self-standing graphene/Ni(OH)2 composites with different morphologies, such as nanoflowers, nanoslices and nanoparticles, are directly synthesized by a facile in situ electrodeposition method.

Cited by 29 publications

References 45 publications

Influence of the content on properties of microwave-exfoliated graphite oxide and Ni(OH)2 composites

Influence of the content on properties of microwave-exfoliated graphite oxide and Ni(OH)2 composites

Electrophoretic deposition of RGO-NiO core-shell nanostructures driven by heterocoagulation method with high electrochemical performance

N-doped carbon coated hollow NixCo9−xS8urchins for a high performance supercapacitor

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Product

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Synthesis of three-dimensional self-standing graphene/Ni(OH)₂ composites for high-performance supercapacitors

N-doped carbon coated hollow Ni_xCo_9−xS₈urchins for a high performance supercapacitor