Continuous nanobelts of nickel oxide–cobalt oxide hybrid with improved capacitive charge storage properties

Harilal, Midhun; Krishnan, Syam G.; Vijayan, Bincy Lathakumary; Reddy, M. V.; Adams, Stefan; Barron, Andrew R.; Yusoff, Mashitah M.; Jose, Rajan

doi:10.1016/j.matdes.2017.03.024

Cited by 76 publications

(44 citation statements)

References 61 publications

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“…The hybrid materials were synthesized from an equal molar ratio of their component precursors and stoichiometric ratios were used for the synthesis of NiCo 2 O 4 . Crystal structure, phase, morphology, and surface property of the materials have been reported in previous publications [17,18].…”

Section: Methodsmentioning

confidence: 95%

“…The NiO-Co 3 O 4 hybrid and NiCo 2 O 4 nanobelts as well as CuO-Co 3 O 4 hybrid, NiO, CuO, and Co 3 O 4 nanowires were prepared by electrospinning as reported before [18,19]. The hybrid materials were synthesized from an equal molar ratio of their component precursors and stoichiometric ratios were used for the synthesis of NiCo 2 O 4 .…”

Section: Methodsmentioning

confidence: 99%

“…NiO-Co 3 O 4 hybrid (HNBs) and spinal-type NiCo 2 O 4 , developed by electrospinning technique were used in this work. On the other hand, the component electrodes of HNBs (i.e., NiO and Co 3 O 4 nanowires) as well as a similar hybrid but nanowires instead of nanobelts (CuO-Co 3 O 4 hybrid nanowires [18]) showed nonlinear voltammetric currents and galvanostatic potentials. The HNBs showed clearly different charge storage behaviour compared with the others.…”

Section: Introductionmentioning

confidence: 99%

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Pseudocapacitive Charge Storage in Thin Nanobelts

et al. 2019

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This article reports that extremely thin nanobelts (thickness ~ 10 nm) exhibit pseudocapacitive (PC) charge storage in the asymmetric supercapacitor (ASC) configuration, while show battery-type charge storage in their single electrodes. Two types of nanobelts, viz. NiO-Co 3 O 4 hybrid and spinal-type NiCo 2 O 4 , developed by electrospinning technique are used in this work. The charge storage behaviour of the nanobelts is benchmarked against their binary metal oxide nanowires, i.e., NiO and Co 3 O 4 , as well as a hybrid of similar chemistry, CuO-Co 3 O 4. The nanobelts have thickness of ~ 10 nm and width ~ 200 nm, whereas the nanowires have diameter of ~ 100 nm. Clear differences in charge storage behaviours are observed in NiO-Co 3 O 4 hybrid nanobelts based ASCs compared to those fabricated using the other materials-the former showed capacitive behaviour whereas the others revealed battery-type discharge behaviour. Origin of pseudocapacitance in nanobelts based ASCs is shown to arise from their nanobelts morphology with thickness less than typical electron diffusion lengths (~ 20 nm). Among all the five type of devices fabricated, the NiO-Co 3 O 4 hybrid ASCs exhibited the highest specific energy, specific power and cycling stability.

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Section: Methodsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pseudocapacitive Charge Storage in Thin Nanobelts

et al. 2019

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“…for energy conversion and storage applications. 35,[47][48][49][50] However, the present crystal/amorphous composite does not show the anticipated properties; the electrical conductivity of the Al(50%) was rather similar to that of pure am-Al 2 O 3 . Despite the inferior electrical conductivity of Al(50%), the sample showed interesting photoelectric properties as detailed subsequently.…”

Section: Resultsmentioning

confidence: 58%

“…We have recently successfully developed composite ceramic nanowires with a similar strategy but focusing on different properties (such as combining electrochemical activity and electrical conductivity, etc.) for energy conversion and storage applications . However, the present crystal/amorphous composite does not show the anticipated properties; the electrical conductivity of the Al(50%) was rather similar to that of pure am‐Al 2 O 3 .…”

Section: Resultsmentioning

confidence: 66%

Photocurrents in crystal‐amorphous hybrid stannous oxide/alumina binary nanofibers

et al. 2019

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Suppression of charge recombination by thin amorphous alumina layers on metal oxide semiconductors has demonstrated a vital role in electronic appliances beside its role as an insulator. This study reports effect of amorphous alumina (Al2O3) on the structural, electrical, and optical properties of stannous oxide (SnO2). The samples for the present study are prepared as nanofibers by electrospinning a polymeric solution containing aluminum and stannous precursors and subsequent annealing; six samples with varying concentrations of aluminum and stannous are considered. A crystal‐amorphous SnO2/Al2O3 hybrid system was confirmed by both XRD and XPS analysis. Both BET and Mott‐Schottky analysis showed increase in the surface area and conduction band minimum of the sample with increase in the Al content, however, at the expense of its electrical conductivity. The electron lifetime of the sample increased with increase in the Al content, but the electron transport time increase with decrease in the electrical conductivity of the sample. Both Urbach energy measurement and Stoke's shift showed generation of deeper trap state with increase in the Al content. Investigation on sample photovoltaic performance showed that the loss in electrical conductivity of the sample can be compensated by the improved surface area to a certain extent. Interestingly, a composite nanofiber containing equal molar fraction of aluminum and stannous showed orders of magnitude higher photocurrent despite its similar resistivity as that of pure alumina fibers, which is shown to originate from a Fermi energy gradient at the Al2O3/SnO2 interface.

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Conductive Polypyrrole Coated Hollow NiCo₂O₄ Microspheres as Anode Material with Improved Pseudocapacitive Contribution and Enhanced Conductivity for Lithium‐Ion Batteries

Luo

Guo

et al. 2018

ChemElectroChem

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Conductive polypyrrole (PPy) coated urchin-like hollow NiCo 2 O 4 (NCO) porous microspheres (NCO@PPy) were synthesized by an easy and cost-effective method. The NCO@PPy shows improved cycling stability and rate capability in comparison with the pure NiCo 2 O 4 when used as anode material for lithium-ion batteries. In order to undersatnd the improvement of electrochemical performance of NCO@PPy, kinetic parameters and the lithium storage mechanism are investigated by EIS spectra and sweep voltammetry measurements. The sweep-rate-dependent CV (cyclic voltammetry) curves demonstrate an ever-increasing redox capacitive-controlled lithium storage originating from both, the hierarchical hollow structure and the effect of the PPy coating layer. The apparent Li + ion diffusion coefficient of NCO@PPy and NCO derived from EIS and CV curves indicates that PPy coating layer reduces the charge-transfer resistances and improves the lithium-ion diffusion coefficient.

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Continuous nanobelts of nickel oxide–cobalt oxide hybrid with improved capacitive charge storage properties

Abstract: Continuous nanobelts of nickel oxide-cobalt oxide hybrid with improved capacitive charge storage properties.

Cited by 76 publications

References 61 publications

Pseudocapacitive Charge Storage in Thin Nanobelts

Pseudocapacitive Charge Storage in Thin Nanobelts

Photocurrents in crystal‐amorphous hybrid stannous oxide/alumina binary nanofibers

Conductive Polypyrrole Coated Hollow NiCo₂O₄ Microspheres as Anode Material with Improved Pseudocapacitive Contribution and Enhanced Conductivity for Lithium‐Ion Batteries

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Continuous nanobelts of nickel oxide–cobalt oxide hybrid with improved capacitive charge storage properties

Abstract: Continuous nanobelts of nickel oxide-cobalt oxide hybrid with improved capacitive charge storage properties.

Cited by 76 publications

References 61 publications

Pseudocapacitive Charge Storage in Thin Nanobelts

Pseudocapacitive Charge Storage in Thin Nanobelts

Photocurrents in crystal‐amorphous hybrid stannous oxide/alumina binary nanofibers

Conductive Polypyrrole Coated Hollow NiCo2O4 Microspheres as Anode Material with Improved Pseudocapacitive Contribution and Enhanced Conductivity for Lithium‐Ion Batteries

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Conductive Polypyrrole Coated Hollow NiCo₂O₄ Microspheres as Anode Material with Improved Pseudocapacitive Contribution and Enhanced Conductivity for Lithium‐Ion Batteries