Synthesis and Characterization of a NiCo2O4@NiCo2O4 Hierarchical Mesoporous Nanoflake Electrode for Supercapacitor Applications

Chen, Xin; Li, Hui; Xu, Jianzhou; Jaber, Fadi; Musharavati, Farayi; Zalezhad, Erfan; Bae, Sung Chul; Hui, Kwan San; Hui, Kwun Nam; Liu, Junxing

doi:10.3390/nano10071292

Cited by 41 publications

(14 citation statements)

References 34 publications

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“…In the chemical bath process, an increase of OH − ions in a precursor solution containing Ni 2+ , Co 2+, and NO3 − occurred by applying NH4OH, which turned into an alkaline condition (pH = 11~14) in the chemical bath. Under the condition, the chemical reaction among different ions such as Ni 2+ , Co 2+ , and OH − ions led to the formation of the NiCo-LDH as expressed by reaction (1) [29,30]. Simultaneously, H2O molecules and NO 3− ions were intercalated into NiCo-LDH interlayer to retain the LDH structure through a hydrogen bond.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of NiCo2O4 Nanostructures and Their Electrochemial Properties for Glucose Detection

et al. 2020

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In this work, we prepared spinel-type NiCo2O4 (NCO) nanopowders as a low-cost and sensitive electrochemical sensor for nonenzymatic glucose detection. A facile and simple chemical bath method to synthesize the NCO nanopowders is demonstrated. The effect of pH and annealing temperature on the formation mechanism of NCO nanoparticles was systematically investigated. Our studies show that different pHs of the precursor solution during synthesis result in different intermediate phases and relating chemical reactions for the formation of NCO nanoparticles. Different morphologies of the NCO depending on pHs are also discussed based on the mechanism of growth. Electrochemical performance of the prepared NCO was characterized towards glucose, which reveals that sensitivity and selectivity of the NCO are significantly related with the final microstructure combined with constituent species with multiple oxidation states in the spinel structure.

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Section: Resultsmentioning

confidence: 99%

“…Simultaneously, H2O molecules and NO 3− ions were intercalated into NiCo-LDH interlayer to retain the LDH structure through a hydrogen bond. Subsequent annealing of the as-synthesized NiCo-LDH caused structural transformation into spinel-type NiCo2O4 (NCO), as described by the reaction (2) [29][30][31][32].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of NiCo2O4 Nanostructures and Their Electrochemial Properties for Glucose Detection

et al. 2020

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“…On the other hand, due to the similar physical properties of Ni and Co, the preparation of nickel-cobalt bimetal oxide of NiCo 2 O 4 is relatively simple and a pure phase structure is easily formed. Synthesis methods vary from sol-gel, chemical precipitation, spray pyrolysis, and electrospinning methods, but many researchers have been the solvothermal or hydrothermal synthesis methods, which are a relatively efficient method to produce NiCo 2 O 4 nanomaterials [20,21]. In addition, nanoparticles of NiCo 2 O 4 have various morphologies such as nanowires, nanorods, nanosheets, nanoparticles, hollow nanospheres, and 3-D nanoflowers, and the electrochemical properties vary depending on the morphologies [22,23].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electrochemical Properties and OER Performances by Cu Substitution in NiCo2O4 Spinel Structure

Park

Choi

et al. 2020

Nanomaterials

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In order to improve the electrochemical performance of the NiCo2O4 material, Ni ions were partially substituted with Cu2+ ions having excellent reducing ability. All of the electrodes were fabricated by growing the Ni1−xCuxCo2O4 electrode spinel-structural active materials onto the graphite felt (GF). Five types of electrodes, NiCo2O4/GF, Ni0.875Cu0.125Co2O4/GF, Ni0.75Cu0.25Co2O4/GF, Ni0.625Cu0.375Co2O4/GF, and Ni0.5Cu0.5Co2O4/GF, were prepared for application to the oxygen evolution reaction (OER). As Cu2+ ions were substituted, the electrochemical performances of the NiCo2O4-based structures were improved, and eventually the OER activities were also greatly increased. In particular, the Ni0.75Cu0.25Co2O4/GF electrode exhibited the best OER activity in a 1.0 M KOH alkaline electrolyte: the cell voltage required to reach a current density of 10 mA cm−2 was only 1.74 V (η = 509 mV), and a low Tafel slope of 119 mV dec−1 was obtained. X-ray photoelectron spectroscopy (XPS) analysis of Ni1−xCuxCo2O4/GF before and after OER revealed that oxygen vacancies are formed around active metals by the insertion of Cu ions, which act as OH-adsorption sites, resulting in high OER activity. Additionally, the stability of the Ni0.75Cu0.25Co2O4/GF electrode was demonstrated through 1000th repeated OER acceleration stability tests with a high faradaic efficiency of 94.3%.

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“…The developed HSCs with the NiCo 2 O 4 @NiMoO 4 core‐shell nanowires with AC negative electrode easily illuminate 111 light emitting diodes (LEDs). Similarly, Chen et al [78] . fabricated NiCo 2 O 4 @NiCo 2 O 4 on Ni form and used it for HSCs against the AC electrode.…”

Section: Roadmap To High‐energy‐density Hybrid Supercapacitorsmentioning

confidence: 99%

Nickel Cobaltite: A Positive Electrode Material for Hybrid Supercapacitors

et al. 2021

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The increased demand of energy due to the recent technological advances in diverse fields such as portable electronics and electric vehicles is often hindered by the poor capability of energy‐storage systems. Although supercapacitors (SCs) exhibit higher power density than state‐of‐the art batteries, their insufficient energy density remains a major challenge. An emerging concept of hybrid supercapacitors (HSCs) with the combination of one capacitive and one battery electrode in a single cell holds a great promise to deliver high energy density without sacrificing power density and cycling stability. This Minireview elaborates the recent advances of use of nickel cobaltite (NiCo2O4) as a potential positive electrode (battery‐like) for HSCs. A brief introduction on the structural benefits and charge storage mechanisms of NiCo2O4 was provided. It further shed a light on composites of NiCo2O4 with different materials like carbon, polymers, metal oxides, and others, which altogether helps in increasing the electrochemical performance of HSCs. Finally, the key scientific challenges and perspectives on building high‐performance HSCs for future‐generation applications were reviewed.

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Synthesis and Characterization of a NiCo2O4@NiCo2O4 Hierarchical Mesoporous Nanoflake Electrode for Supercapacitor Applications

Cited by 41 publications

References 34 publications

Synthesis of NiCo2O4 Nanostructures and Their Electrochemial Properties for Glucose Detection

Synthesis of NiCo2O4 Nanostructures and Their Electrochemial Properties for Glucose Detection

Enhanced Electrochemical Properties and OER Performances by Cu Substitution in NiCo2O4 Spinel Structure

Nickel Cobaltite: A Positive Electrode Material for Hybrid Supercapacitors

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