Simple chemical route for nanorod-like cobalt oxide films for electrochemical energy storage applications

Nwanya, Assumpta C.; Obi, Daniel; Osuji, R. U.; Bucher, R.; Mâaza, M.; Ezema, Fabian I.

doi:10.1007/s10008-017-3520-8

Cited by 46 publications

(13 citation statements)

References 32 publications

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“…In order to tackle those challenges, plenty of fundamental studies have been developed in nanostructuring materials, such as nanorods, nanospheres and nanoplatelets, which can relax the strains caused by the volume variations and improve the accessibility of anode to the electrolyte, thus leading to the enhancement of electrochemical performance. [8,9] Although the improvement of cycling performance and rate capability can be observed through nanostructuring the Co 3 O 4 materials, the high performance can not be maintained after long-term cycling due to the collapse of nanostructure. nanofibers/reduced graphene oxide, [12] Co 3 O 4 /graphene nanocomposite, [13] and so on.…”

Section: Introductionmentioning

confidence: 99%

Co3O4-graphene nanoflowers as anode for advanced lithium ion batteries with enhanced rate capability

Jiang

Yan

Xiao

et al. 2017

Journal of Alloys and Compounds

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The practical application of Co 3 O 4 base anode material is severely limited by its extremely low electrical conductivity and large specific volume changes during lithium ion insertion/extraction. Herein, an effective strategy is being implemented to mitigate the capacity fading of Co 3 O 4 at high-rate by embedding Co 3 O 4 nanomaterial under the reduced graphene oxide (CGF). The CGF composite has been synthesized through a two-step process, involving a hydrothermal reaction of cobalt nitrate hexahydrate and CTAB in the presence of graphene oxide (GO) and a subsequent calcination. When tested as the anode in lithium ion batteries (LIBs), the CGF composite exhibits an obvious enhancement in electrochemical performance, especially in rate capability. Under current density of 1.0 A g −1 , the CGF composite could deliver reversible capacity as high as

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Section: Introductionmentioning

confidence: 99%

Co3O4-graphene nanoflowers as anode for advanced lithium ion batteries with enhanced rate capability

Jiang

Yan

Xiao

et al. 2017

Journal of Alloys and Compounds

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“…The distortion of the semicircle is related to the exponent n . For n = 0, the CPE is a perfect resistor; for n = 1, the CPE is a perfect capacitor; when n = −1, the CPE is an inductor; while for n = 0.5, it is Warburg impedance ( Z w ) 61‐63 . Hence, the Warburg impedance which relates to the semi‐infinite linear diffusion in an electrochemical system is given by Equation ) 64 :

Z_{(W_{1})} = \frac{A_{w}}{\sqrt{2 πjf}}

where A w is the Warburg coefficient and f is frequency.…”

Section: Resultsmentioning

confidence: 99%

Impedance studies of biosynthesized Na_0.₈Ni₀_.₃₃Co₀_.₃₃Mn₀_.₃₃O₂applied in an aqueous sodium‐ion battery

et al. 2021

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Summary We studied Na0.8Ni0.33Co0.33Mn0.33O2 nanoparticles synthesized using water‐based extract procured from the dried silk of maize (Zea mays lea) plant. The synthesized Na0.8Ni0.33Co0.33Mn0.33O2 was used as the positive electrode in an aqueous sodium ion battery (SIB). X‐ray diffraction (XRD) studies of the biosynthesized material reveal that it can be indexed to the trigonal structure of Na0.8Ni 0.33Co0.33Mn0.33O2 with an R 3m space group (160), (ICSD 184736) although impurities of Mn2O3 and NiO were detected. Surface morphological studies from a scanning electron microscope (SEM) disclose that the nanoparticles consist of an interspersion of sheath‐like particles with quasi‐spherical nanoparticles of uneven dimensions. The sheath‐like particles seem to agglomerate to form layers that coalesce into flower‐like structures that are spread within the quasi‐spherical nanoparticles. The material yielded a rechargeable discharge capacity of about 86 mA h g−1 in a three‐electrode system consisting of platinum, the Na0.8Ni0.33Co0.33Mn0.33O2 and Ag/AgCl as the counter, working and reference electrodes respectively at a current density of 10 mA g−1. However, a full cell using P25 Degussa TiO2 and the biosynthesized Na0.8Ni0.33Co0.33Mn0.33O2 as the negative and the positive electrode, respectively, and having a mass ratio of 1:1 yielded a discharge capacity of 49 mA h g−1 at a current density of 5 mA g−1. Impedance studies for a symmetrical cell developed showed that the magnitude of the impedance is highest at 0% and 100 state of charge (SOC).

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“…where m = the mass of deposit, (dV/dt) = the scan rate, ldt = the area under the CV curve and C s = the specific capacitance (F/g) [36][37][38][39].…”

Section: Electrochemical Studies 351 Cyclic Voltammetry (Cv)mentioning

confidence: 99%

Nanostructured Mn-doped CeO2 thin films with enhanced electrochemical properties for pseudocapacitive applications

Nwachukwu

Nwanya

Osuji

et al. 2021

Journal of Alloys and Compounds

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Simple chemical route for nanorod-like cobalt oxide films for electrochemical energy storage applications

Cited by 46 publications

References 32 publications

Co3O4-graphene nanoflowers as anode for advanced lithium ion batteries with enhanced rate capability

Co3O4-graphene nanoflowers as anode for advanced lithium ion batteries with enhanced rate capability

Impedance studies of biosynthesized Na_0.₈Ni₀_.₃₃Co₀_.₃₃Mn₀_.₃₃O₂applied in an aqueous sodium‐ion battery

Nanostructured Mn-doped CeO2 thin films with enhanced electrochemical properties for pseudocapacitive applications

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Simple chemical route for nanorod-like cobalt oxide films for electrochemical energy storage applications

Cited by 46 publications

References 32 publications

Co3O4-graphene nanoflowers as anode for advanced lithium ion batteries with enhanced rate capability

Co3O4-graphene nanoflowers as anode for advanced lithium ion batteries with enhanced rate capability

Impedance studies of biosynthesized Na0.8Ni0.33Co0.33Mn0.33O2applied in an aqueous sodium‐ion battery

Nanostructured Mn-doped CeO2 thin films with enhanced electrochemical properties for pseudocapacitive applications

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Impedance studies of biosynthesized Na_0.₈Ni₀_.₃₃Co₀_.₃₃Mn₀_.₃₃O₂applied in an aqueous sodium‐ion battery