Engineering cationic vacancies on sphere-like zinc cobaltite microstructures<i>via</i>self-assembly of silkworm-like interconnected nanoparticles for battery-type supercapacitors

Raju, B. Deva Prasad; Gangavarapu, Prathyusha; Jung, Namgee; Sravani, Bathinapatla; Joo, Sang Woo

doi:10.1039/d2ce01682f

Cited by 16 publications

(1 citation statement)

References 58 publications

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“…Figure a compares the CV curves for the four ZCO electrodes, recorded at a potential window of −0.2 to 0.7 V versus Ag/AgCl used at 25 mV s –1 . All the electrodes displayed distinct redox peaks in their CV curves, contributing to M–O/M–O–O–OH’s reversible faradaic redox reactions (where M represents Zn and Co ions) in the presence of OH – anions. , This observation strongly supports the battery-type electrode behavior, as illustrated by the preceding equations − …”

Section: Results and Discussionsupporting

confidence: 76%

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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Section: Results and Discussionsupporting

confidence: 76%

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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Multifaceted characterization of a Zn0.9Ca0.1Fe2O4/CeO2/NiFe2O4 nanocomposite electrode for battery-type supercapacitors

Manohar,

Reddy,

Roy

et al. 2024

Ceramics International

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Comprehensive characterization of a Mn0.1Mg0.9Fe2O4/CeO2/MgFe2O4 nanocomposite for high-performance supercapacitor applications

Manohar,

Reddy,

Roy

et al. 2024

Ceramics International

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Engineering cationic vacancies on sphere-like zinc cobaltite microstructuresviaself-assembly of silkworm-like interconnected nanoparticles for battery-type supercapacitors

Abstract: In this study, we utilized the solvothermal synthesis method to engender Zn vacancies on spinel ZnCo2O4 microspheres (VZn-ZCO), intending to improve their electrochemical performance. X-ray photoelectron spectroscopy was used to...

Cited by 16 publications

References 58 publications

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

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

Multifaceted characterization of a Zn0.9Ca0.1Fe2O4/CeO2/NiFe2O4 nanocomposite electrode for battery-type supercapacitors

Comprehensive characterization of a Mn0.1Mg0.9Fe2O4/CeO2/MgFe2O4 nanocomposite for high-performance supercapacitor applications

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