Mesoporous ZnCo<sub>2</sub>O<sub>4</sub> nanoflakes grown on nickel foam as electrodes for high performance supercapacitors

Cheng, Jinbing; Lu, Yang; Qiu, Kangwen; Yan, Hailong; Hou, Xiaoyi; Xu, Jinyou; Han, Lei; Liu, Xianming; Kim, Jang Kyo; Luo, Yongsong

doi:10.1039/c5cp01629k

Cited by 105 publications

(36 citation statements)

References 44 publications

(43 reference statements)

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“…It is found that the electrode before cycling test has a more vertical straight line, demonstrating a lower Warburg resistance representing the ion diffusion of the electrolyte into the electrode surface . The electrode after 3000 cycles has an obvious bigger semicircle, which means a higher charge‐transfer resistance on the electrode surface . While the intersection of the curve at Z′ axis is equal to internal resistances which represent the bulk resistance of the electrochemical system.…”

Section: Resultsmentioning

confidence: 97%

From Water and Ni Foam to a Ni(OH)₂@Ni Foam Binder‐Free Supercapacitor Electrode: A Green Corrosion Route

et al. 2017

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In this work, a Ni(OH)2@Ni foam binder‐free electrode was obtained through the corrosion of Ni foam with ultrapure water under hydrothermal conditions. The structure, morphology, and surface chemical states of the obtained Ni(OH)2@Ni foam were characterized by X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, and X‐ray photoelectron spectroscopy. The chemical formation mechanism is discussed. In addition, it was found that the loading amount and morphology of the deposited Ni(OH)2 depend largely on the corrosion time. Furthermore, electrodes corroded for different times were then directly used as working electrodes to investigate the areal and specific capacitances of the deposited Ni(OH)2 by using cyclic voltammetry, through which a relationship between the corrosion time, loading amount, morphology, and final capacitance is built up. The electrode with the highest areal capacitance was further studied with cyclic voltammetry, galvanostatic charge−discharge processes, as well as electrochemical impedance spectroscopy. The as‐prepared Ni(OH)2@Ni foam is a typical pseudocapacitance electrode. At a high current density of 5 mA cm−2, the electrode exhibits an areal capacitance of 0.863 F cm−2. For the deposited Ni(OH)2, its specific capacitance reaches 693 F g−1 at a current density of 4 A g−1. After 3000 charge−discharge cycles at a current density as high as 10 A g−1 (12.5 mA cm−2), the areal capacitance retains 77.3 % of its initial value. The findings in this work could be meaningful for the corrosion preparation of related electrodes and the design of binder‐free electrodes.

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Section: Resultsmentioning

confidence: 97%

From Water and Ni Foam to a Ni(OH)₂@Ni Foam Binder‐Free Supercapacitor Electrode: A Green Corrosion Route

et al. 2017

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“…19 Another example is ZnCo 2 O 4 nanoakes, which could deliver a specic capacitance up to 1220 F g À1 at 2 A g À1 , which was about 500 F g À1 higher than that of Co 3 O 4 under the same conditions. 20 MgCo 2 O 4 with a spinel structure stands out among a variety of BTMOs because of its high theoretical specic capacitance ($3122 F g À1 ) and other good electrochemical properties. In the MgCo 2 O 4 crystal structure, the Mg cation occupies the tetrahedral site and the Co cation occupies the octahedral site.…”

Section: Introductionmentioning

confidence: 99%

Facile hydrothermal synthesis of porous MgCo₂O₄ nanoflakes as an electrode material for high-performance asymmetric supercapacitors

Chen

et al. 2020

Nanoscale Adv.

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“…ZnCo 2 O 4 (ZCO) has been promoted as an electrode material for energy storage devices due to its high theoretical capacitance, electrical conductance, enhanced cycle stability, abundant resources and low price [ 25 , 26 , 27 ]. Recently, ZCO has been studied for Li-ion batteries and photocatalytic CO 2 reduction [ 28 , 29 ]. ZCO materials have been prepared with various morphologies such as nanosheets, nanorods, nanotubes, nanowires and nanoparticles [ 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Supercapacitive Performance of Higher-Ordered 3D-Hierarchical Structures of Hydrothermally Obtained ZnCo2O4 for Energy Storage Devices

et al. 2020

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The demand for eco-friendly renewable energy resources as energy storage and management devices is increased due to their high-power density and fast charge/discharge capacity. Recently, supercapacitors have fascinated due to their fast charge–discharge capability and high-power density along with safety. Herein, the authors present the synthesis of 3D-hierarchical peony-like ZnCo2O4 structures with 2D-nanoflakes by a hydrothermal method using polyvinylpyrrolidone. The reaction time was modified to obtain two samples (ZCO-6h and ZCO-12h) and the rest of the synthesis conditions were the same. The synthesized structures were systematically studied through various techniques: their crystalline characteristics were studied through XRD analysis, their morphologies were inspected through SEM and TEM, and the elemental distribution and oxidation states were studied by X-ray photoelectron spectroscopy (XPS). ZCO-12h sample has a larger surface area (55.40 m2·g−1) and pore size (24.69 nm) than ZCO-6h, enabling high-speed transport of ions and electrons. The ZCO-12h electrode showed a high-specific capacitance of 421.05 F·g−1 (31.52 C·g−1) at 1 A·g−1 and excellent cycle performance as measured by electrochemical analysis. Moreover, the morphologic characteristics of the prepared hierarchical materials contributed significantly to the improvement of specific capacitance. The excellent capacitive outcomes recommend the 3D-ZnCo2O4 hierarchical peony-like structures composed of 2D-nanoflakes as promising materials for supercapacitors with high-performance.

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Mesoporous ZnCo₂O₄ nanoflakes grown on nickel foam as electrodes for high performance supercapacitors

Cited by 105 publications

References 44 publications

From Water and Ni Foam to a Ni(OH)₂@Ni Foam Binder‐Free Supercapacitor Electrode: A Green Corrosion Route

From Water and Ni Foam to a Ni(OH)₂@Ni Foam Binder‐Free Supercapacitor Electrode: A Green Corrosion Route

Facile hydrothermal synthesis of porous MgCo₂O₄ nanoflakes as an electrode material for high-performance asymmetric supercapacitors

Enhanced Supercapacitive Performance of Higher-Ordered 3D-Hierarchical Structures of Hydrothermally Obtained ZnCo2O4 for Energy Storage Devices

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Mesoporous ZnCo2O4 nanoflakes grown on nickel foam as electrodes for high performance supercapacitors

Cited by 105 publications

References 44 publications

From Water and Ni Foam to a Ni(OH)2@Ni Foam Binder‐Free Supercapacitor Electrode: A Green Corrosion Route

From Water and Ni Foam to a Ni(OH)2@Ni Foam Binder‐Free Supercapacitor Electrode: A Green Corrosion Route

Facile hydrothermal synthesis of porous MgCo2O4 nanoflakes as an electrode material for high-performance asymmetric supercapacitors

Enhanced Supercapacitive Performance of Higher-Ordered 3D-Hierarchical Structures of Hydrothermally Obtained ZnCo2O4 for Energy Storage Devices

Contact Info

Product

Resources

About

Mesoporous ZnCo₂O₄ nanoflakes grown on nickel foam as electrodes for high performance supercapacitors

From Water and Ni Foam to a Ni(OH)₂@Ni Foam Binder‐Free Supercapacitor Electrode: A Green Corrosion Route

From Water and Ni Foam to a Ni(OH)₂@Ni Foam Binder‐Free Supercapacitor Electrode: A Green Corrosion Route

Facile hydrothermal synthesis of porous MgCo₂O₄ nanoflakes as an electrode material for high-performance asymmetric supercapacitors