Microwave induced synthesis of mandarin-flower shaped ZnCo2O4/GO nanocomposites as efficient electrocatalyst for oxygen reduction reaction

Kiran, G. K.; Sreekanth, T.V.M.; Nagajyothi, P.C.; Yoo, Kisoo; Kim, J.

doi:10.1016/j.matlet.2022.132026

Cited by 4 publications

(5 citation statements)

References 11 publications

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“…44 In the Zn 2p spectrum (Fig. 4c), two peaks at 1021.2 eV (Zn 2p 3/2 ) and 1044.2 eV (Zn 2p 1/2 ) are assigned to the Zn (+2) chemical state of Cd 0.5 Zn 0.5 S. 45 Moreover, the XPS spectrum of S 2p in Cd 0.5 Zn 0.5 S (Fig. 4d) showed two peaks, located at 160.9 eV and 162.1 eV, respectively, which are characteristic of S 2À .…”

Section: Resultsmentioning

confidence: 99%

Construction of CoS/Cd_0.5Zn_0.5S ohmic heterojunctions for improving photocatalytic hydrogen production activity

et al. 2023

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Section: Resultsmentioning

confidence: 99%

Construction of CoS/Cd_0.5Zn_0.5S ohmic heterojunctions for improving photocatalytic hydrogen production activity

et al. 2023

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“…These structures grow in specific directions, forming a uniform, flower-like ZnCo 2 (OH) x structure. Upon calcination, the ZnCo 2 (OH) x material transforms to porous, ultrathin flower-like spinel ZnCo 2 O 4 , retaining the well-conserved morphology of some small nanoparticles. ,, …”

Section: Results and Discussionmentioning

confidence: 99%

“…Upon calcination, the ZnCo 2 (OH) x material transforms to porous, ultrathin flower-like spinel ZnCo 2 O 4 , retaining the well-conserved morphology of some small nanoparticles. 15,21,25 XPS low-resolution scans of the four ZCO samples are compared in Figure S9. The samples have similar profiles of O, Zn, Co, and C (which arise due to the atmosphere's physisorption during the samples' preparation under nonvacuum conditions).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The materials used for the synthesis are presented in the Supporting Information. As reported in the literature, ZnCo 2 O 4 was synthesized using a microwave-assisted hydrothermal method . Typically, 2 mM zinc nitrate, 4 mM cobalt nitrate, 10 mM ammonium fluoride (NH 4 F), and 12 mM hexamethylenetetraamine (HMT) were added to a 100 mL deionized water beaker and stirred until dissolved.…”

Section: Methodsmentioning

confidence: 99%

“…As reported in the literature, ZnCo 2 O 4 was synthesized using a microwave-assisted hydrothermal method. 25 Typically, 2 mM zinc nitrate, 4 mM cobalt nitrate, 10 mM ammonium fluoride (NH 4 F), and 12 mM hexamethylenetetraamine (HMT) were added to a 100 mL deionized water beaker and stirred until dissolved. This solution was taken in a Teflon-lined stainless steel vessel and heated at 160 °C for 10 min in a microwave digestion system.…”

Section: ■ Methodsmentioning

confidence: 99%

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Investigation of Zn-to-Co Chemometric Ratio in Zinc Cobaltite Spinel as Battery-Type Superior Redox-Active Electrodes for Hybrid Supercapacitors: Density Functional Theory Analysis

Prasad,

Dilip Borse,

Rajasekhara Reddy

et al. 2024

J. Phys. Chem. C

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Engineering nonstoichiometric metal ions in the binary metal oxides is gaining importance in electrochemical energy storage and conversion devices. Zinc cobaltite (ZnCo 2 O 4 ), a p-type spinel structure, has been stringently applied in these fields. In this work, the chemometric ratios of metal ions (Zn and Co) are varied, and the impact of this nonstoichiometry on the electronic structure-modified ZnCo 2 O 4 and its effect on the electrochemical properties are studied in detail. The experiment uses the microwave-assisted hydrothermal method to vary the metal precursor to get the desired nonstoichiometry between Zn and Co in the ZnCo 2 O 4 binary metal oxides. A set of four different samples is prepared by varying the Zn−Co precursor stoichiometric concentrations as 0.5−4, 1.0−4, 1.5−4, and 2.0−4, respectively. These four ZCO samples are first confirmed by X-ray diffraction analysis, followed by refining the structures to determine the nonstoichiometries of the elements and supported by X-ray photoelectron spectroscopy. Density functional theory is applied to determine the electronic structure of ZnCo 2 O 4 with fully stoichiometric (bulk or no vacancy), three different, single-atom (Zn−, O−)-and dual atom (Zn− and O−)-deficient ZnCo 2 O 4 and compared. Among four samples, ZCO-1.5−4 and ZCO-2.0−4 are constructed in a hybrid supercapacitor device for practical application. The optimum ZCO-1.5−4 with Zn-and O-deficiency electrodes has shown better specific capacity (312.5 C g −1 at 1 A g −1 ), energy density (49.4 W h kg −1 ), and power density (10.168 kW kg −1 ) than other electrodes. Therefore, the work will provide a database for constructing various chemometric ratios of binary metal oxides for achieving optimized nonstoichiometry for the enhanced electrochemical performance of the practical device.

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Solid Phase Synthesis Catalyzed by Microwave and Ultrasound Irradiation

Hameed,

Amr,

Emad

et al. 2024

Green Chemical Synthesis With Microwaves and Ultrasound

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Microwave induced synthesis of mandarin-flower shaped ZnCo2O4/GO nanocomposites as efficient electrocatalyst for oxygen reduction reaction

Cited by 4 publications

References 11 publications

Construction of CoS/Cd_0.5Zn_0.5S ohmic heterojunctions for improving photocatalytic hydrogen production activity

Construction of CoS/Cd_0.5Zn_0.5S ohmic heterojunctions for improving photocatalytic hydrogen production activity

Investigation of Zn-to-Co Chemometric Ratio in Zinc Cobaltite Spinel as Battery-Type Superior Redox-Active Electrodes for Hybrid Supercapacitors: Density Functional Theory Analysis

Solid Phase Synthesis Catalyzed by Microwave and Ultrasound Irradiation

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Microwave induced synthesis of mandarin-flower shaped ZnCo2O4/GO nanocomposites as efficient electrocatalyst for oxygen reduction reaction

Cited by 4 publications

References 11 publications

Construction of CoS/Cd0.5Zn0.5S ohmic heterojunctions for improving photocatalytic hydrogen production activity

Construction of CoS/Cd0.5Zn0.5S ohmic heterojunctions for improving photocatalytic hydrogen production activity

Investigation of Zn-to-Co Chemometric Ratio in Zinc Cobaltite Spinel as Battery-Type Superior Redox-Active Electrodes for Hybrid Supercapacitors: Density Functional Theory Analysis

Solid Phase Synthesis Catalyzed by Microwave and Ultrasound Irradiation

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Product

Resources

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Construction of CoS/Cd_0.5Zn_0.5S ohmic heterojunctions for improving photocatalytic hydrogen production activity

Construction of CoS/Cd_0.5Zn_0.5S ohmic heterojunctions for improving photocatalytic hydrogen production activity