Structural and electrochemical properties of ZnCo2O4 nanoparticles synthesized by hydrothermal method

Priya, M.; Premkumar, Viji; Vasantharani, P.; Sivakumar, G.

doi:10.1016/j.vacuum.2019.06.020

Cited by 47 publications

(26 citation statements)

References 41 publications

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“…For all samples, the diffraction peaks are located at 2 θ values around 18.70°, 31.29°, 36.68°, 38.70°, 44.68°, 55.68°, 59.47°, 65.09°, and 77.30°, which correspond to the (111), (220), (311), (222), (400), (422), (511), (440), and (533) planes of standard ZnCo 2 O 4 (Joint Committee on Powder Diffraction Standards Card No: 23‐1390), 9,25 respectively. The average crystallite sizes of PVP‐L@6 (PVP lower concentration [10 mg] at lower reaction time [180°C/6 h]), PVP‐H@6 (PVP higher concentration [50 mg] at lower reaction time [180°C/6 h]), PVP‐L@12 (PVP lower concentration [10 mg] at higher reaction time [180°C/12 h]), and PVP‐H@12 (PVP higher concentration [50 mg] at higher reaction time [180°C/12 h]) were approximately 17.1, 16.5, 16.1, and 16.2 nm, respectively, determined from the (311) diffraction peak using Scherer's formula 26,27 …”

Section: Resultsmentioning

confidence: 99%

“…Cyclic voltammetry (CV), galvanostatic charge-discharge cycling (GCD), and electrochemical impedance spectroscopy (EIS) techniques were used to examine the potential of the electrochemical performance of the samples using the commercial instrument, CHI 760E, CH Instruments, USA. 26,27 Although all the patterns appear similar, the structures were refined using the Rietveld method 28 (by X'Pert HighScore Plus commercial software, PANalytical BV) to quantify non-stoichiometry of metal (Zn/Co) and oxygen in the ZCO samples. The refined structures of all samples are shown in Figure 2, and refined parameters are summarized in Table 2.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

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Effect of reaction time and PVP contents on morphologies of hierarchical 3D flower‐like ZnCo ₂ O ₄ microstructures for energy storage devices

et al. 2020

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Hierarchical 3D flower-like ZnCo 2 O 4 (ZCO) microstructures assembled from petal-like nanosheets/flakes of non-uniform sizes were engineered by a polyvinylpyrrolidone (PVP)-assisted hydrothermal method. Four different samples/ morphologies of ZCO were obtained (PVP-L@6, PVP-H@6, PVP-L@12, and PVP-H@12) by altering the reaction parameters such as surfactant concentration (PVP) and reaction time, which can play a significant role in the formation of flower-/petal-/flake-like architectures. The alteration of the reaction parameters not only resulted in morphological changes but also affected the surface area, pore size/volume, crystalline nature, non-stoichiometry of Zn, Co, and O in ZCO, and their electrochemical performance. The metal (Zn/Co)/O deficiencies of ZCO samples were investigated via X-ray photoelectron spectroscopy and supported by the Rietveld refinement method. Furthermore, a plausible growth mechanism for these flower-like ZCO microstructures was projected based on the experimental results. The four dissimilar samples/morphologies of ZCO, which exhibit different electrochemical performances, were investigated. Our results show that PVP-H@12 exhibits higher specific capacitance (761/680 F g −1 at 0.35/1 A g −1) and good cycling constancy (90% capacitive retention after 2000 cycles at 5 Ag −1) among all the four samples.

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Section: Resultsmentioning

confidence: 99%

Section: Electrochemical Measurementsmentioning

confidence: 99%

Effect of reaction time and PVP contents on morphologies of hierarchical 3D flower‐like ZnCo ₂ O ₄ microstructures for energy storage devices

et al. 2020

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“…For instance, the nanostructured ZnCo 2 O 4 such as coral-like nanowires, peony-like structure, hierarchical microspheres and cubic-like structure showed the higher specific capacitances compared to bulk counterparts. [22][23][24][25][26] Along with the nanoarchitecture, the introduction of defects and oxygen vacancy states substantially plays a positive role in modifying the electronic properties of the transition-metal oxides. Thus, it can enhance their electrical conductivity and further expedite the surface redox reaction kinetics, which is expected to improve the energy storage performances of the metal oxide electrode materials.…”

Section: Introductionmentioning

confidence: 99%

3D flower‐like oxygen‐deficient non‐stoichiometry zinc cobaltite for high performance hybrid supercapacitors

et al. 2021

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Non-stoichiometry and defect engineering of nanostructured materials plays a vital role in controlling the electronic structure, which results in enhancing the electrochemical performances. Herein, we report three-dimensional (3D) oxygen-deficient flower-like non-stoichiometry zinc cobaltite (Zn 1.5 Co 1.5 O 4−δ ) for hybrid supercapacitor applications. In particular, XRD, XPS and Raman analyses confirm the oxygen-deficiency of the nonstoichiometry Zn 1.5 Co 1.5 O 4−δ . The oxygen-deficient non-stoichiometry and 3D hierarchical porous structure of Zn 1.5 Co 1.5 O 4−δ offer the efficient utilization of abundant electrochemical active sites and the rapid transportation of ion/electron. Accordingly, the Zn 1.5 Co 1.5 O 4−δ electrode achieves the high specific capacitance of 763.32 F g −1 at 1 A g −1 , which is superior to those of ZnCo 2 O 4 (613.14 F g − 1), Co 3 O 4 (353.88 F g −1 ) and ZnO (248.59 F g −1 ). The hybrid supercapacitor cells, configuring Zn 1.5 Co 1.5 O 4−δ as the positive electrode and activated carbon as negative electrodes, respectively, deliver the maximum energy/power densities (40.49 W h kg −1 at 397.37 W kg −1 and 20.87 W h kg −1 at 50.08 kW kg −1 ) and outstanding cycle stability with capacitance retention of 89.42% over 20 000 cycles.

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“…As we all know, the electrochemical characteristics of electrode materials play a crucial role in determining the electrochemical performance of SCs. Therefore, researchers have been focused on developing electrode materials with large specific surface area, excellent conductivity and mechanical stability [9–11] …”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Mesoporous Urchin‐like Co−Ni−Fe Ternary Hydroxide Nanoneedles on Ni Foam for Electrochemical Applications

et al. 2021

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A novel mesoporous urchin‐like Co−Ni−Fe ternary hydroxide (CoNiFe−TH) assembled by a large amount of nanoneedles on nickel foam was successfully prepared through a facile one‐step hydrothermal method. The mesoporous urchin‐like CoNiFe−TH nanoneedle electrode has a high specific capacitance of 1318.52 F g−1 at a current density of 1 A g−1 in a three‐electrode system. Besides, the electrode exhibits an excellent cycling stability with 63.3 % specific capacitance retention and almost 100 % Coulombic efficiency during 1000 cycles of a charge‐discharge process at a current density of 5 A g−1. The excellent electrochemical performance of the electrode is due to the unique mesoporous urchin‐like CoNiFe−TH nanoneedles structures with more active reaction sites and polymetallic synergistic effects, which can facilitate the faradic reaction process to improve the electrochemical performance. The current synthesis method can be used for the preparation of other ternary transition metal hydroxides as electrode materials for supercapacitors.

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Structural and electrochemical properties of ZnCo2O4 nanoparticles synthesized by hydrothermal method

Cited by 47 publications

References 41 publications

Effect of reaction time and PVP contents on morphologies of hierarchical 3D flower‐like ZnCo ₂ O ₄ microstructures for energy storage devices

Effect of reaction time and PVP contents on morphologies of hierarchical 3D flower‐like ZnCo ₂ O ₄ microstructures for energy storage devices

3D flower‐like oxygen‐deficient non‐stoichiometry zinc cobaltite for high performance hybrid supercapacitors

Hydrothermal Synthesis of Mesoporous Urchin‐like Co−Ni−Fe Ternary Hydroxide Nanoneedles on Ni Foam for Electrochemical Applications

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Structural and electrochemical properties of ZnCo2O4 nanoparticles synthesized by hydrothermal method

Cited by 47 publications

References 41 publications

Effect of reaction time and PVP contents on morphologies of hierarchical 3D flower‐like ZnCo 2 O 4 microstructures for energy storage devices

Effect of reaction time and PVP contents on morphologies of hierarchical 3D flower‐like ZnCo 2 O 4 microstructures for energy storage devices

3D flower‐like oxygen‐deficient non‐stoichiometry zinc cobaltite for high performance hybrid supercapacitors

Hydrothermal Synthesis of Mesoporous Urchin‐like Co−Ni−Fe Ternary Hydroxide Nanoneedles on Ni Foam for Electrochemical Applications

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Product

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Effect of reaction time and PVP contents on morphologies of hierarchical 3D flower‐like ZnCo ₂ O ₄ microstructures for energy storage devices

Effect of reaction time and PVP contents on morphologies of hierarchical 3D flower‐like ZnCo ₂ O ₄ microstructures for energy storage devices