Direct synthesis of Co 2 Al(OH) 7−2x (CO 3 ) x · n H 2 O layered double hydroxide nanolayers by successive ionic layer deposition and their capacitive performance

Lobinsky, A.A.; Tolstoy, Valeri P.; Gulina, L. B.

doi:10.1016/j.apsusc.2014.09.136

Cited by 24 publications

(6 citation statements)

References 26 publications

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“…The peaks at 1631, 1452, 1401, and 1114 cm À1 are matched with the C=O stretching, CO 3 stretching, C-O stretching vibration, and CO 3 in-plane scissoring, respectively. 1,30,31 Another peak at 3500 cm À1 consistent with the O-H stretching vibration and the peak at 751 cm À1 corresponded to the C-C stretching vibration. 32,33 The Raman spectrum of CoHC-rGO in Figure 2B exhibits two peaks at 1348 and 1599 cm À1 , which correspond to the D and G bands of rGO, respectively.…”

Section: Resultsmentioning

confidence: 95%

Novel synthesis method of cobalt hydroxycarbonate hydrate‐reduced graphene oxide composite microspheres for lithium‐ion battery anode

2021

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Transition metal compounds (TMCs) consisting of multiple anions are considered as efficient anode materials for lithium-ion batteries (LIBs) owing to their characteristic of transforming into multiple metal compounds with single anions during the first cycle. Nanostructured composites of TMCs with multiple anions and a conductive carbon component can enhance lithium-ion storage through the synergistic effects of the formation of heterointerfaced structures, structural stability, and high conductivity. Herein, cobalt hydroxycarbonate hydratereduced graphene oxide (CoHC-rGO) composite microspheres are introduced. The spray pyrolysis process facilitates formation of cobalt chloride-rGO composite precursor powders. The prepared precursor powders are finally converted into CoHC-rGO composites through in-situ precipitation within the microspheres. The conversion mechanism of CoHC-rGO with lithium ions is systemically scrutinized via rational in-situ and ex-situ analyses. Uniquely structured CoHC-rGO microspheres exhibit better electrochemical properties than the bare CoHC nanopowders. The CoHC-rGO microspheres have high reversibility of 440 mA h g À1 at 1500th cycle even at 5 A g À1 .

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Section: Resultsmentioning

confidence: 95%

Novel synthesis method of cobalt hydroxycarbonate hydrate‐reduced graphene oxide composite microspheres for lithium‐ion battery anode

2021

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“…1), in the composition of the nanolayers, synthesized after 50 SILD cycles, it is possible to separate individual flat nanocrystals approximately 6 -10 nm thick, oriented mainly perpendicular to the surface of the substrate. We assume that the appearance of such mainly oriented nanocrystals on the surface is a proof of the previously established model of their growth [16], which is based on the idea of the formation of the 2D NiOOH nanocrystals arranged in the same plane on the surface after the first SILD cycles. These nanocrystals possess the morphology of nanosheets that, as the number of SILD cycles increases, change their planar geometry due to the repulsive interaction of areas of equal charge.…”

Section: Resultsmentioning

confidence: 70%

Electrocatalytic properties of γ-NiOOH nanolayers, synthesized by successive ionic layer deposition, during the oxygen evolution reaction upon water splitting in the alkaline medium

Lobinsky¹,

Tolstoy²,

Kodinzev³

2018

Nanosystems: Phys. Chem. Math.

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Nickel oxyhydroxide nanolayers were synthesized on the surface of nickel foam and single crystalline silicon through Successive Ionic Layer Deposition (SILD) method by using aqueous solutions NiSO 4 and K 2 S 2 O 8. The obtained nanolayers were characterized by SEM, XRD, FTIR and XPS spectroscopy. The electrochemical properties of the electrodes were defined from polarization curves. SEM images revealed that nanolayers are formed by nanosheets with a thickness of 6-10 nm. The nanolayers were shown to exhibit electrocatalytic properties during the oxygen evolution reaction upon water splitting in the alkaline medium. By setting the number of SILD cycles, these properties can be changed precisely. For a number of samples, synthesized after 30-120 SILD cycles, it was found that in the oxygen evolution reaction the lowest overpotential value of 260 mV and the lowest Tafel slope of 54 mV/dec are achieved for the sample, synthesized after 90 SILD cycles.

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“…The SILD method provides a simple and effective means for creating metal oxide nanolayers for thin-film electrodes, which may result in significantly improved electronic conductivity and high electrochemical performance of pseudocapacitors. The possibility of creating electrode materials on the basis of thin-film nanolayers of layered double hydroxides, which showed a good electrochemical performance, has been shown in our previous work [15,16].…”

Section: Introductionmentioning

confidence: 87%

Red-ox reactions in aqueous solutions of Co(OAc)2 and K2S2O8 and synthesis of CoOOH nanolayers by the SILD method

Lobinsky¹,

Tolstoy²

2015

Nanosist.: fiz. him. mat.

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CoOOH nanolayers were first prepared by the successive ionic layer deposition (SILD) method using aqueous Co(OAc) 2 and K 2 S 2 O 8 solutions. The obtained nanolayers were investigated by SEM, EDX, XRD, FTIR spectroscopy and electrochemical techniques. SEM images showed that the layers formed by nanosheets of size approximately 80-100 nm which had a hexagonal crystal structure. Electrochemical study of nickel foam electrodes modified by CoOOH layer prepared by 50 SILD cycles demonstrates that specific capacitance of the film is 1520 F/g at current density 1 A/g. Repeated cycling for 1000 charge-discharge cycles demonstrates 2% capacitance fade, so such electrodes may be used as pseudocapacitor electrodes.

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Direct synthesis of Co 2 Al(OH) 7−2x (CO 3 ) x · n H 2 O layered double hydroxide nanolayers by successive ionic layer deposition and their capacitive performance

Cited by 24 publications

References 26 publications

Novel synthesis method of cobalt hydroxycarbonate hydrate‐reduced graphene oxide composite microspheres for lithium‐ion battery anode

Novel synthesis method of cobalt hydroxycarbonate hydrate‐reduced graphene oxide composite microspheres for lithium‐ion battery anode

Electrocatalytic properties of γ-NiOOH nanolayers, synthesized by successive ionic layer deposition, during the oxygen evolution reaction upon water splitting in the alkaline medium

Red-ox reactions in aqueous solutions of Co(OAc)2 and K2S2O8 and synthesis of CoOOH nanolayers by the SILD method

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