High performance NiCo-LDH//Fe2O3 asymmetric supercapacitors based on binder-free electrodes with dual conductive networks

Jiang, Shun-Hua; Ding, Jian; Wang, Ronghua; Deng, Yingxiong; Chen, Fuyu; Zhou, Minquan; Gui, Hao; Li, Xinlu; Xu, Chaohe

doi:10.1016/j.cej.2021.133936

Cited by 50 publications

(12 citation statements)

References 65 publications

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“…For FOCNF, typical cathodic and anodic peaks can be observed during the charge–discharge process, corresponding to the reversible Faradic conversion between Fe 2 O 3 and Fe(OH) 2 according to the following equation. [ 46 ]

{Fe}_{2} {normalO}_{3} {+ 2e}^{‐} {+ 3H}_{2} O \leftrightarrow 2Fe {false(OH false)}_{2} {+ 2OH}^{‐}

…”

Section: Resultsmentioning

confidence: 99%

Embedding Metal–Organic Frameworks for the Design of Flexible Hybrid Supercapacitors by Electrospinning: Synthesis of Highly Graphitized Carbon Nanofibers Containing Metal Oxide Nanoparticles

Zhu²,

et al. 2022

Small Structures

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Electrospun carbonaceous fibers have emerged as promising electrode materials for application in energy storage devices. However, their relatively poor electrical conductivity (due to their amorphous carbon structures) and low capacitive performance lead to poor prospects for their further application. Herein, a universal synthesis of highly graphitized carbon nanofibers, containing various metal oxide nanoparticles (e.g., Fe2O3, NiO), by the pyrolysis of metal–organic framework (MOF)‐embedded electrospun nanofibers, is reported. The resulting carbon nanofibers exhibit large mesopore volumes, contain large quantities of Faradic metal oxide nanoparticles, and are highly graphitized. The fibers also have excellent mechanical flexibility, provide fast ion transfer characteristics, and a large pseudocapacitance combined with excellent electrical conductivity, leading to large specific capacitances. Consequently, asymmetric flexible hybrid supercapacitors assembled from Fe2O3‐embedded highly graphitized carbon nanofibers (FOCNF) and NiO‐embedded highly graphitized carbon nanofibers (NOCNF) exhibit a high energy density of 43.1 Wh kg−1 at a power density of 412.5 W kg−1 and possess excellent flexibility (capacitance retention of 94.4% at 180° bending and 96.2% at 30° twisting) with superior cycling stability. This strategy provides a new MOF‐based approach for the design and synthesis of multifunctional flexible carbonaceous materials and might lead to their further application in flexible energy storage devices.

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{Fe}_{2} {normalO}_{3} {+ 2e}^{‐} {+ 3H}_{2} O \leftrightarrow 2Fe {false(OH false)}_{2} {+ 2OH}^{‐}

…”

Section: Resultsmentioning

confidence: 99%

Embedding Metal–Organic Frameworks for the Design of Flexible Hybrid Supercapacitors by Electrospinning: Synthesis of Highly Graphitized Carbon Nanofibers Containing Metal Oxide Nanoparticles

Zhu²,

et al. 2022

Small Structures

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“…According to Equation (5), the value of b can be determined by the fitted slopes of log( i ) and log( v ). It is worth noting that when the b value is close to 0.5, the electrochemical process is dominated by diffusion, and when the b value is close to 1, the surface capacitive behavior is dominated [ 47 ]. As can be seen in Figure 4 g, the b values of the CoVO-HNC anode and cathode peaks are 0.84 and 0.86, respectively.…”

Section: Resultsmentioning

confidence: 99%

ZIF-67 Derived Co2VO4 Hollow Nanocubes for High Performance Asymmetric Supercapacitors

Zhu

2022

Nanomaterials

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In this work, a new type of Co2VO4 hollow nanocube (CoVO-HNC) was synthesized through an ion exchange process using ZIF-67 nanocubes as a template. The hollow nanocubic structure of the CoVO-HNC provides an abundance of redox sites and shortens the ion/electron diffusion path. As the electrode material of supercapacitors, the specific capacitance of CoVO-HNC is 427.64 F g−1 at 1.0 A g−1. Furthermore, an asymmetric supercapacitor (ASC) was assembled using CoVO-HNC and activated carbon (AC) as electrodes. The ASC device attains an energy density of 25.28 Wh kg−1 at a high-power density of 801.24 W kg−1, with 78% capacitance retention after 10,000 cycles at 10 A g−1.

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“…6,7 Therefore, to fabricate supercapacitors with high power density and high energy density, it is necessary to develop novel electrode materials, electrolytes, and innovative device configurations. 8 The commonly used electrode materials for supercapacitors include carbon materials [activated carbon, 9 carbon nanotubes (CNTs), 10 graphene, 11 carbon fibers, 12 and carbon aerogels 13 ], transition-metal oxides (RuO 2 , 14 MnO 2 , 15 IrO 2 , 16 NiO, 17 Fe 2 O 3 , 18 Co 3 O 4 , 19 and V 2 O 5 20 ), conductive polymers [polypyrrole, 21 polythiophene, 22 and polyaniline (PANI) 23,24 ] and their various composites. 25−30 Electrode materials made of carbon display the typical behavior of an EDLC.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Coral-like Polyaniline/Continuously Reinforced Carbon Nanotube Woven Composite Films for Flexible High-Stability Supercapacitor Electrodes

Shi

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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The electrochemical performance is significantly influenced by the structure and surface morphology of the electrode materials used in supercapacitors. Using the floating catalytic chemical vapor deposition (FCCVD) technique, a self-supporting, flexible layer of continuously reinforced carbon nanotube woven film (CNWF) was developed. Then, polyaniline (PANI) was formed in the conductive network of CNWF using cyclic voltammetry electrochemical polymerization (CVEP) in various aqueous electrolytes to produce a series of flexible CNWF/PANI composite films. The impacts of the CVEP period, electrolyte type, and electrolyte concentration on the surface morphology, doping degree, and hydrophilicity of CNWF/PANI composite films were thoroughly examined. The CNWF/PANI1-15C composite electrode, which was created using 15 cycles of CVEP in a solution of 1 M sodium bisulfate, displayed a distinctive coral-like PANI layer with a well-defined sharp nanoprotuberance structure, a 48% doping degree, and a quick reversible pseudocapacitive storage mechanism. At a current density of 1 A g–1, the energy density and specific capacitance reached 54.9 Wh kg–1 and 1098.0 F g–1, respectively, with a specific capacitance retention rate of 75.9% maintained at 10 A g–1. Both the specific capacitance and coulomb efficiency were maintained at 96.9% and more than 98.1% of their initial values after being subjected to 2000 cycles of galvanostatic charge and discharge, demonstrating excellent electrochemical cycling stability. The CNWF/PANI1-15C composite film, an ideal electrode material, offers a promising future in the field of flexible energy storage due to its exceptional mechanical properties (127.9 MPa tensile strength and 16.2% elongation at break).

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High performance NiCo-LDH//Fe2O3 asymmetric supercapacitors based on binder-free electrodes with dual conductive networks

Cited by 50 publications

References 65 publications

Embedding Metal–Organic Frameworks for the Design of Flexible Hybrid Supercapacitors by Electrospinning: Synthesis of Highly Graphitized Carbon Nanofibers Containing Metal Oxide Nanoparticles

Embedding Metal–Organic Frameworks for the Design of Flexible Hybrid Supercapacitors by Electrospinning: Synthesis of Highly Graphitized Carbon Nanofibers Containing Metal Oxide Nanoparticles

ZIF-67 Derived Co2VO4 Hollow Nanocubes for High Performance Asymmetric Supercapacitors

Fabrication of Coral-like Polyaniline/Continuously Reinforced Carbon Nanotube Woven Composite Films for Flexible High-Stability Supercapacitor Electrodes

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