Core-shell structured Co 3 O 4 @NiCo 2 O 4 electrodes grown on flexible carbon fibers with superior electrochemical properties

Wu, Xiang; Han, Zhicheng; Zheng, Xin; Yao, Shunyu; Yang, Xue; Zhai, Tianyou

doi:10.1016/j.nanoen.2016.11.035

Cited by 342 publications

(114 citation statements)

References 40 publications

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“…The use of pseudocapacitive materials, such as transition metal oxides and conducting polymers [12][13][14][15], instead of carbon based materials, leads to enhanced energy density without significant loss of power density. This enhancement results from the additive effect of fast superficial redox reactions and electric double layer formation at the electrode/electrolyte interface.…”

Section: Introductionmentioning

confidence: 99%

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

Upadhyay

Altomare

Eugénio

et al. 2017

Electrochimica Acta

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Keywords: electrochemical anodization WO 3 nanostructure phosphoric acid supercapacitor energy storage A B S T R A C T Herein we illustrate the functionality as pseudocapacitive material of tungsten trioxide (WO 3 ) nanochannel layers fabricated by electrochemical anodization of W metal in pure hot ortho-phosphoric acid (o-H 3 PO 4 ). These layers are characterized by a defined nanochannel morphology and show remarkable pseudocapacitive behaviour in the negative potential (À0.8-0.5 V) in neutral aqueous electrolyte (1 M Na 2 SO 4 ). The maximum volumetric capacitance of 397 F cm À3 is obtained at 2 A cm À3. The WO 3 nanochannel layers display full capacitance retention (up to 114%) after 3500 charge-discharge cycles performed at 10 A cm À3 . The relatively high capacitance and retention ability are attributed to the high surface area provided by the regular and defined nanochannel morphology. Kinetic analysis of the electrochemical results for the best performing WO 3 structures, i.e., grown by 2 h-long anodization, reveals the occurrence of pseudocapacitance and diffusional controlled processes. Electrochemical impedance spectroscopy measurements show for the same structures a relatively low electrical resistance, which is the plausible cause for the superior electrochemical behaviour compared to the other structures.

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Section: Introductionmentioning

confidence: 99%

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

Upadhyay

Altomare

Eugénio

et al. 2017

Electrochimica Acta

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“…For the emerging application, further capacitance improvement of carbon electroactive materials is a vital requirement for flexible SCs.Introducing heteroatoms including N, O, P and B into the carbon matrix is an promising approach ,. Among various heteroatom, the N doping has been proposed as the most promising and widely studied one, for that nitrogen doping can enhance the electrical conductivity, surface polarity, wettability, and electroactive surface area of carbon materials, and thus an additional pseudo‐capacitance, high rate performance, and good cycling stability could be achieved ,…”

Section: Conductive Polymers As Carbon Source For the Preparation Of mentioning

confidence: 99%

Conducting Polymer Nanostructures and their Derivatives for Flexible Supercapacitors

Cheng

Meng

Wei

2018

Israel Journal of Chemistry

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This review provides a brief summary of the recent research developments in the fabrication and application of conducting polymer nanostructures and their derivatives as electrodes for flexible supercapacitors (SCs). By controlling the nucleation and growth process of polymerization, conducting polymers (CPs) with different nanostructures can be prepared by employing chemical polymerization, electrochemical polymerization and photo-induced polymerization. These CPs (such as polyaniline and polypyrrole) with special nanostructures possess high capacitance, superior rate capability ascribed to large electrochemical surface, and optimal ion diffusion path in the ordered nanostructures.The composites of nano-structured conducting polymer and some conductive flexible substrates (such as carbon nanotube film and graphene film) are proved to be ideal electrode materials for high performance flexible SCs. Furthermore, high N-containing CPs are very prospective for preparing Ndoped carbon materials used as flexible electrodes for flexible SCs. With respect to the extra pseudo-capacitance induced by N atoms and superior stability derived from the conjugated graphitic structure of carbon materials, the obtained flexible SCs based on N-doped carbon materials could achieve high capacitance, high rate performance, and superior cycling stability. Figure 1. Specific power against specific energy, also called a ragone plot, for various electrical energy storage devices. Reproduced with permission from ref. 4.

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“…While, the energy density of commercial supercapacitors is still insufficient, which seriously hinders the further practical application of supercapacitors . The performance of supercapacitors is mainly affected by electrode materials and electrolytes, so the development of new materials/structures is one of the efficient ways to improve the performance for electrochemical capacitors (ECs) , …”

Section: Introductionmentioning

confidence: 99%

“…In the crystal structure, Co 3+ from tetrahedron and Co 2+ from octahedron were replaced by low toxicity Ni 2+ , which can form Co 2+ /Co 3+ and Ni 2+ /Ni 3+ solid electron pairs to provide more active sites for redox reactions in alkaline medium . Besides, this multiplex oxide has more excellent performance than single metal oxides, so the design and synthesis of NiCo 2 O 4 with novel structure and high capacitance performance becomes a research hotspot , , , …”

Section: Introductionmentioning

confidence: 99%

Hierarchical Porous NiCo₂O₄ Microboxes Constructed by Low‐Dimensional Substructures for Electrochemical Supercapacitor

Zhu

Zhang

Sha

et al. 2020

Zeitschrift anorg allge chemie

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The design and synthesis of new materials/structures for highperformance electrochemical capacitors (ECs) is an ongoing challenge. Herein, a hierarchical porous NiCo 2 O 4 microbox superstructure made of low-dimensional substructures was reported. The as-prepared NiCo 2 O 4 microboxes are constructed by 2D nanosheets building units, which are futher woven by 0D nanoparticles and 1D nanowires. Such microbox Supercapacitors, as one efficient energy storage system, have been widely used in electric vehicles, due to its fast rechargeable rate, long cycle life, wide operating temperature range and so on. [1] While, the energy density of commercial supercapacitors is still insufficient, which seriously hinders the further practical application of supercapacitors. [2] The performance of supercapacitors is mainly affected by electrode materials and electrolytes, so the development of new materials/structures is one of the efficient ways to improve the performance for electrochemical capacitors (ECs). [3,4] Ni-Co oxide (NiCo 2 O 4 ) has attracted great interest as a promising material for superior supercapacitive properties owing to its attractive features of low cost, low toxicity, natural abundance, and diverse nanostructures. [5][6][7][8] NiCo 2 O 4 has typical crystal tip acceptance and belongs to the same cubic crystal system as Co 3 O 4 . In the crystal structure, Co 3+ from tetrahedron and Co 2+ from octahedron were replaced by low toxicity Ni 2+ , which can form Co 2+ /Co 3+ and Ni 2+ /Ni 3+ solid electron pairs to provide more active sites for redox reactions in alkaline medium. [9][10][11][12][13] Besides, this multiplex oxide has more excellent performance than single metal oxides, so the design and synthesis of NiCo 2 O 4 with novel structure and high capacitance performance becomes a research hotspot. [1,2,4,7] 53 superstructures combine the merits of all material dimensions in electrochemical capacitors, such as high porosity, sufficient active sites, and fast mass and charge transport. Benefiting from the structural advantages, the resultant NiCo 2 O 4 microbox electrode exhibits ultra-high capacitor performance, i.e., the initial capacitance of 1820 F·g -1 and 96.6 % capacitance retention after 4000 cycles at 5 A·g -1 .

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Core-shell structured Co 3 O 4 @NiCo 2 O 4 electrodes grown on flexible carbon fibers with superior electrochemical properties

Cited by 342 publications

References 40 publications

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

Conducting Polymer Nanostructures and their Derivatives for Flexible Supercapacitors

Hierarchical Porous NiCo₂O₄ Microboxes Constructed by Low‐Dimensional Substructures for Electrochemical Supercapacitor

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Core-shell structured Co 3 O 4 @NiCo 2 O 4 electrodes grown on flexible carbon fibers with superior electrochemical properties

Cited by 342 publications

References 40 publications

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

Conducting Polymer Nanostructures and their Derivatives for Flexible Supercapacitors

Hierarchical Porous NiCo2O4 Microboxes Constructed by Low‐Dimensional Substructures for Electrochemical Supercapacitor

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Product

Resources

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Hierarchical Porous NiCo₂O₄ Microboxes Constructed by Low‐Dimensional Substructures for Electrochemical Supercapacitor