Sponge microflowers of NiCo2O4: a versatile material for high performance supercapacitor

Ghadage, Ambar; Kodam, Pavan; Nadargi, Digambar Y.; Shinde, K.P.; Mulla, I.S.; Park, J. S.; Suryavanshi, S.S.

doi:10.1007/s10934-022-01247-9

Cited by 6 publications

(4 citation statements)

References 48 publications

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“…Figure 5a displays the X-ray photoelectronic survey spectrum, which confirms that all of the elements present in the heterostructure electrode are similar to those from FE-SEM−EDS measurements. 44 Further, the photoelectronic spectra of individual elements present in the heterostructure are detailed in Figure 5. The fitting of the Ni 2p spectrum yields two spin−orbit doublets at 855.2 eV (2p 3/2 ) and 873.3 eV (2p 1/2 ).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Exploring the Heterostructure Engineering of SnS/NiCo₂O₄ for Overall Water Splitting

et al. 2022

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A bifunctional electrocatalyst with a low overpotential is a prerequisite for realizing efficient overall water splitting. In this scenario, the search for low-cost and non-precious electrocatalysts in electrolysis research leads to the employment of spinel oxides and chalcogenides. Herein, a heterostructure bifunctional electrocatalyst consisting of tin sulfide (SnS) nanosheets engrafted onto nickel cobalt oxide (NiCo 2 O 4 ) nanoneedles suspended on nickel foam was prepared using the conventional hydrothermal method. The interface of SnS/NiCo 2 O 4 was found to contain half-metallic Sn−O bonds as evident from density functional theory calculations and X-ray photoelectron spectroscopy. Furthermore, SnS growth on NiCo 2 O 4 triggers new crystalline (0 2 1) planes and the vertical orientation of nanosheets enhancing the catalytic kinetics by exposing more surface S atoms, which provide a lower adsorption energy for hydrogen/oxygen moieties. The SnS/NiCo 2 O 4 catalyst on Ni foam exhibits overpotentials of 302 mV (at a current density of 20 mA cm −2 ) and 154 mV (at a current density of 20 mA cm −2 ) for oxygen and hydrogen evolution reactions, respectively, in a 1.0 M potassium hydroxide electrolyte. Furthermore, a potential of 1.57 V was required to attain a current density of 10 mA cm −2 in the overall water-splitting process. Apart from this bifunctional ability, the catalyst shows good stability (>25 h) in the electrolyte. The growth of chalcogenides on spinel oxides paves a new way to realize efficient electrocatalysts with reduced adsorption energies.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Exploring the Heterostructure Engineering of SnS/NiCo₂O₄ for Overall Water Splitting

et al. 2022

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“…31,32 Figure 2a displays the XPS survey spectra of NiCo 2 O 4 within binding energy domain of 200 to 1000 eV, which shows the typical , respectively, which are trustworthy as compared to previously published studies. 33,34 The satellite peaks of Ni 2p 3/2 and Ni 2p 1/2 are ascribed at 880.0 and 861.2 eV, respectively. 35,36 Figure 2c represent the core level spectra of Co 2p, which consists two pair of spin-orbit doublets along with two satellite peaks.…”

Section: ( ) + ( ) + → +mentioning

confidence: 97%

Unraveling the Pseudocapacitive Charge Storage Mechanism of NiCo₂O₄ Nanoflakes for Advanced Quasi Solid-State Hybrid Supercapacitor

Jhankal,

Yadav,

Shakya

et al. 2024

J. Electrochem. Soc.

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Design and development of battery-type electrode materials with high capacitance, wide potential window, and desirable cycle stability are essential to enhance the performance of hybrid supercapacitors (HSC). In this study, a simple sol-gel synthesis strategy has been adopted to fabricate spinel NiCo2O4 nanoflakes. The morphological and structural analysis shows that the NiCo2O4 is formed with nanoflakes morphology with high phase purity and good stoichiometry. The electrochemical study of the NiCo2O4 electrode in 1 M Na2SO4 aqueous electrolyte reveals that the electrode has a maximum specific capacitance of 488 F g-1 at 2 A g-1. Detailed electrochemical examinations of cyclic voltammogram (CV) and electrochemical impedance spectroscopy (EIS) profiles reveal the pseudocapacitive charge storage kinetics of NiCo2O4 electrode. Furthermore, a hybrid supercapacitor device is constructed by employing molybdenum-disulfide (MoS2) & reduced graphene oxide (rGO) nanocomposite and NiCo2O4 as the negative and positive electrodes, respectively. PVA-Na2SO4 is utilized as the polymer gel electrolyte. The HSC device delivered highest specific capacitance of 106 F g-1 at a current density of 0.8 A g-1 with superior cyclic stability. Thus, exploring strategies for superior performance through material modification and selection of suitable electrolyte has been useful and makes this study significant among the reported related works.

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“…The first weight loss (B2.8%) occurs between 25 and 180 1C, which could be ascribed to the desorption of physically adsorbed water on the prepared powder. [37][38][39][40][41] The second weight loss (B5%) takes place between 220 and 350 1C, due to the CO 2 emission caused by the decomposition of cobalt carbonate to Co 3 O 4 (eqn (1)), and the dehydroxylation reaction of nickel hydroxide to produce the nickel oxide NiO (eqn (2)). 9,39,42 The third weight loss (B28%) occurs above 750 1C, which is attributed to melting of the salt, reduction of Co 3 O 4 to CoO (eqn (3)) and total decomposition of the NiCo 2 O 4 material resulting in the emergence of NiO.…”

Section: Tga Analysismentioning

confidence: 99%

The first structural, morphological and magnetic property studies on spinel nickel cobaltite nanoparticles synthesized from non-standard reagents

et al. 2023

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Sponge microflowers of NiCo2O4: a versatile material for high performance supercapacitor

Cited by 6 publications

References 48 publications

Exploring the Heterostructure Engineering of SnS/NiCo₂O₄ for Overall Water Splitting

Exploring the Heterostructure Engineering of SnS/NiCo₂O₄ for Overall Water Splitting

Unraveling the Pseudocapacitive Charge Storage Mechanism of NiCo₂O₄ Nanoflakes for Advanced Quasi Solid-State Hybrid Supercapacitor

The first structural, morphological and magnetic property studies on spinel nickel cobaltite nanoparticles synthesized from non-standard reagents

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Sponge microflowers of NiCo2O4: a versatile material for high performance supercapacitor

Cited by 6 publications

References 48 publications

Exploring the Heterostructure Engineering of SnS/NiCo2O4 for Overall Water Splitting

Exploring the Heterostructure Engineering of SnS/NiCo2O4 for Overall Water Splitting

Unraveling the Pseudocapacitive Charge Storage Mechanism of NiCo2O4 Nanoflakes for Advanced Quasi Solid-State Hybrid Supercapacitor

The first structural, morphological and magnetic property studies on spinel nickel cobaltite nanoparticles synthesized from non-standard reagents

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Product

Resources

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Exploring the Heterostructure Engineering of SnS/NiCo₂O₄ for Overall Water Splitting

Exploring the Heterostructure Engineering of SnS/NiCo₂O₄ for Overall Water Splitting

Unraveling the Pseudocapacitive Charge Storage Mechanism of NiCo₂O₄ Nanoflakes for Advanced Quasi Solid-State Hybrid Supercapacitor