Ni–Co composite metal embedded porous N-doped carbon for an effective binder-free supercapacitor electrode

Feng, Keqin; Huang, Huanfeng; Shi, Dandi; Diao, Guiqiang; Zhang, Xiyue

doi:10.1557/jmr.2017.454

Cited by 7 publications

(5 citation statements)

References 61 publications

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“…The presence of broad peaks could possibly be due to the contribution of various NiCo oxides . Similar redox peaks were observed for NiCo‐oxides as well as for nickel cobaltite‐based materials ,. Notably, the NiCo‐oxide/G electrode presents a considerably larger current density than the counterpart, the NiCo oxide electrode.…”

Section: Resultsmentioning

confidence: 99%

Graphene‐Wrapped Nanoporous Nickel‐Cobalt Oxide Flakes for Electrochemical Supercapacitors

et al. 2018

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A novel approach for hybridizing nanoporous NiCo oxide flakes with graphene sheets is reported. Positively charged cyano‐bridged CoNi coordination polymer flakes (CoNi‐CP) are mixed with graphene (G) suspension with negatively charged surface. Due to effective electrostatic interaction, both the materials are hybridized to form CoNi‐CP/G composite. The as‐prepared CoNi‐CP/G composite is thermally treated in air, to remove the organic components without affecting the integrity of the parent G sheets. Through the thermal treatment, the CoNi‐CP flakes wrapped into G sheets are converted to NiCo oxide, resulting in a new composite consisting of NiCo oxide flakes and G sheets. The NiCo‐oxide/G composite shows the high specific capacitance (∼ 199 F g‐1) at 5 mV/s, and features the good capacitance retention of ∼68% at 100 mV(∼ 135 F g−1).

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Section: Resultsmentioning

confidence: 99%

Graphene‐Wrapped Nanoporous Nickel‐Cobalt Oxide Flakes for Electrochemical Supercapacitors

et al. 2018

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“…As shown in Figure 4d, the G‐NCGs electrode maintains the smaller charge transfer resistance ( R ct) at high frequency as well as a lower Warburg resistance ( R w ) in the low‐frequency region by comparison with the cycled NCGs electrode, which indicates good conductivity and enhanced ion diffusion rate of the G‐NCGs electrode compared to the NCGs. [ 33 ]…”

Section: Resultsmentioning

confidence: 99%

Ni (II) Coordination Supramolecular Grids for Aqueous Nickel‐Zinc Battery Cathodes

Zhang

Zhou

et al. 2021

Adv Funct Materials

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Aqueous rechargeable nickel‐zinc batteries (NZBs) have the advantages of economical cost and reliable safety. Despite reports of success in achieving high‐utilization and stable Zn anodes, the practical application of NZBs has been plagued by the restrictive capacity density and degradation of the Ni‐based cathode. Herein, it is reported that nickel‐ligand coordination grids (NCGs) with a high theoretical capacity of 128.12 mAh g−1 offer a fast faradic reaction while maintaining good reversibility due to the abundant open metal sites and flexible network structures. In situ and ex situ characterizations demonstrate that the graphene nanosheet (GN) modification of NCGs supramolecular substantially boosts surface charge and reducing the work function of supramolecular compounds. A Ni//Zn battery using such a graphene organic‐inorganic material (G‐NCGs) achieve a high gravimetric capacity of 113.8 mAh g−1 at 0.5 A g−1 with 50% of its initial capacitance retained after 2000 cycles and an exceptional rate capacity of 43.3 mAh g−1 even at the current density of 5.0 A g−1.

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“…As can be seen from Figure 3 a–d, NiCo-layered double hydroxides (LDH; before annealing) and bare NiCo 2 O 4 nanoflakes covered the surface of the substrate uniformly after the hydrothermal process. The creation of the nanoflake layer was based on non-homogeneous growth and nucleation, because of lower interfacial nucleation energy on the nickel foam [ 25 , 26 ]. The nanoflakes are very thin, causing complete employment of the active material.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of a NiCo2O4@NiCo2O4 Hierarchical Mesoporous Nanoflake Electrode for Supercapacitor Applications

Chen

et al. 2020

Nanomaterials

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In this study, we synthesized binder-free NiCo2O4@NiCo2O4 nanostructured materials on nickel foam (NF) by combined hydrothermal and cyclic voltammetry deposition techniques followed by calcination at 350 °C to attain high-performance supercapacitors. The hierarchical porous NiCo2O4@NiCo2O4 structure, facilitating faster mass transport, exhibited good cycling stability of 83.6% after 5000 cycles and outstanding specific capacitance of 1398.73 F g−1 at the current density of 2 A·g−1, signifying its potential for energy storage applications. A solid-state supercapacitor was fabricated with the NiCo2O4@NiCo2O4 on NF as the positive electrode and the active carbon (AC) was deposited on NF as the negative electrode, delivering a high energy density of 46.46 Wh kg−1 at the power density of 269.77 W kg−1. This outstanding performance was attributed to its layered morphological characteristics. This study explored the potential application of cyclic voltammetry depositions in preparing binder-free NiCo2O4@NiCo2O4 materials with more uniform architecture for energy storage, in contrast to the traditional galvanostatic deposition methods.

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Ni–Co composite metal embedded porous N-doped carbon for an effective binder-free supercapacitor electrode

Abstract: Abstract

Cited by 7 publications

References 61 publications

Graphene‐Wrapped Nanoporous Nickel‐Cobalt Oxide Flakes for Electrochemical Supercapacitors

Graphene‐Wrapped Nanoporous Nickel‐Cobalt Oxide Flakes for Electrochemical Supercapacitors

Ni (II) Coordination Supramolecular Grids for Aqueous Nickel‐Zinc Battery Cathodes

Synthesis and Characterization of a NiCo2O4@NiCo2O4 Hierarchical Mesoporous Nanoflake Electrode for Supercapacitor Applications

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