Rational design of cobalt–nickel double hydroxides for flexible asymmetric supercapacitor with improved electrochemical performance

Wu, Yuling; Chen, Hao; Lu, Yingzhuo; Yang, Jae Young; Zhu, Xinqiang; Zheng, Yu; Lou, Gaobo; Wu, Yitian; Wu, Qiang; Shen, Zhen; Pan, Zhenghui

doi:10.1016/j.jcis.2020.08.013

Cited by 104 publications

(46 citation statements)

References 56 publications

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“…The Ti 3 C 2 T x film is then prepared by natural sedimentation. In step II, the Ti 3 C 2 T x film serves as the substrate to fabricate the Co‐MOF arrays by room temperature deposition, [ 21 ] in which Co 2+ ions adsorb on the surface of Ti 3 C 2 T x electrostatically and 2‐MIM is mixed with Co 2+ for coordination reaction resulting in in situ growth of Co‐MOF arrays. Finally, Co‐MOF@Ti 3 C 2 T x is immersed in the aqueous NiSO 4 to undergo hydrolysis‐induced ion etching, deposition, and growth.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Cobalt‐Nickel Double Hydroxide Arrays Assembled on Naturally Sedimented Ti₃C₂T_x for High‐Performance Flexible Supercapacitors

Bai

Zhang

Guo

et al. 2021

Advanced Sustainable Systems

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of the promising candidates for energy storage due to the high power density, environmental friendliness, remarkable charge/discharge capability, long cycling life, and safety. [4,5] Processing nanomaterials into freestanding films with high conductivity and good mechanical stability is of great significance for supercapacitors. To choose appropriate nanomaterials for high-performance supercapacitors, remarkable surface properties, inherent high strength and electrical conductivity must be considered. [6,7] In the search for alternatives that provide all these characteristics, MXene, a recently discovered 2D material shows great potential. MXenes is a novel candidate of the 2D family (MXenes described as M n+1 X n T x , where M, X, and T x usually represent the early transition metal, C or N, and adsorbed surface functional groups such as OH, O, and F, where n = 1, 2, or 3). [8] 2D transition metal carbide and nitride MXene (including Ti 3 C 2 T x , Mo 2 CT x , and V 4 C 3 T x ) are excellent electrode materials for supercapacitors due to the high metallic conductivity, excellent cycling stability, and surface chemical groups galore. [9] The preparation of MXene freestanding film by vacuum-assisted filtration is the optimal choice to achieve these properties. [10] For instance, rolled Ti 3 C 2 T x films show a high conductivity of 150 000 S m −1 and gravimetric capacitance Flexible electrodes with excellent energy storage and conversion properties that can be produced by a simple process are highly desirable for supercapacitors. Herein, Cobalt-Nickel double hydroxide (CoNi-DH) micro-nanosheet arrays are prepared uniformly on naturally sedimented Ti 3 C 2 T x films by an etching-deposition-growth process to form a CoNi-DH@Ti 3 C 2 T x heterostructure. The naturally sedimented Ti 3 C 2 T x film serves as the substrate to minimize aggregation of the CoNi-DH nano arrays to enhance the electrical conductivity. Furthermore, the hierarchical structure comprised of the CoNi-DH interconnected nanoarrays promotes electrolyte access. By taking advantage of the excellent electrical conduction and high theoretical specific capacitance, the flexible CoNi-DH@Ti 3 C 2 T x electrode in the supercapacitor delivers a superior specific capacitance of 919.5 F g −1 at 1 A g −1 , and remarkable capacitance retention of 89.6% after 5000 cycles at 20 A g −1 . Density-functional theory calculations are performed to investigate the charge density difference and partial density of states of CoNi-DH@Ti 3 C 2 T x and the theoretical assessment suggests that the chemical bonds between Ti 3 C 2 T x and CoNi-DH are critical to the charge transport, electrical conductivity, and structural stability.

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Section: Resultsmentioning

confidence: 99%

Hierarchical Cobalt‐Nickel Double Hydroxide Arrays Assembled on Naturally Sedimented Ti₃C₂T_x for High‐Performance Flexible Supercapacitors

Bai

Zhang

Guo

et al. 2021

Advanced Sustainable Systems

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“…[ 3 ] Active materials of EDLCs mainly include activated carbons, carbon nanotubes, graphene, and porous carbon, [3b,4] which possess high power density and long cyclic life but low energy density. Pseudocapacitive materials, such as transition metal oxides, [ 5 ] double metal hydroxides, [ 6 ] and conducting polymers, [ 7 ] feature a high energy density benefiting from the fast Faradic reaction occurring at or near the surface of active materials. [ 8 ] Conducting polymer is more suitable for application in flexible SCs because of the ﬂexibility of macromolecular chains compared with metal oxides.…”

Section: Introductionmentioning

confidence: 99%

Polyaniline/Small‐Sized MXene/Carbon Cloth Electrodes with 3D Hierarchical Porous Structure for All‐Solid‐State Flexible Supercapacitors

Zhang

Zhao

et al. 2022

Energy Tech

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The porous structure of electrodes can exert a significant impact on electrochemical performances of supercapacitors. Herein, the polyaniline/small‐sized MXene/carbon cloth (PANI/S‐MXene/CC) electrodes with 3D hierarchical porous structure are fabricated by a facile single‐step pulsed electrodeposition. First, the PANI/S‐MXene nanowires closely overlap each other and form a nanosized pore structure, which provides large specific surface area and abundant ion diffusion channels. Second, the CC with a large pore structure can facilitate permeation of gel electrolyte. S‐MXene with small lateral size not only decreases charge transfer resistance of electrodes, but also ensures an interconnected porous framework. Consequently, the assembled all‐solid‐state flexible device delivers a high areal capacitance (478.4 mF cm−2 at 0.5 mA cm−2), a superior rate capability (307.5 mF cm−2 at 10 mA cm−2), a remarkable energy density (42.5 μWh cm−2), favorable cycle stability (75.4% capacitance retention after 4000 cycles), as well as 93.2% capacitance retention after 180° mechanical bending with 1000 cycles. Herein, it is revealed that size selection of nanomaterials is a priority when the porous structure is designed.

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“…[12] In this method, the exchange reaction between VO 3 À plus OH À and 2-MIM of CoÀ MOF was utilized to in situ grow CoÀ V composite leaf arrays on the surface of carbon cloth. Wu et al prepared a wisteria flower-like CoNi-LDH growing on the surface of carbon cloth based on an in-situ hydrolysis-induced exchange process between organic ligand of the CoÀ MOF and hydroxide ions in a solution containing Ni 2 + [13] and the results showed that CoNiÀ DHÀ S@CC possessed an excellent electrochemical performance and encouraging application potential. Tao et al designed an amorphous hydroxyl-rich Co 3 O 4 hierarchical structure material with excellent rate and cycle performance by electrochemical oxidation of CoÀ MOF.…”

Section: Introductionmentioning

confidence: 99%

Ni(OH)₂/NiSe Nanoparticles Supported on Carbon Microspheres for Long‐Life and High‐Performance Asymmetric Supercapacitors

et al. 2022

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The application of Ni-MOF in supercapacitors has received widespread attention, but its poor conductivity and bad stability hinder its application. Therefore, Ni-MOF derived CMs@Ni(OH) 2 /NiSe with a core-shell structure was designed.Here, carbon microspheres (CMs) were explored as the conductive substrate to enhance the stability and in situ prepared Ni-MOF was anchored on the surface of CMs. Then, alkalitreatment and selenylation were carried out on CMs@NiÀ MOF to improve stability and conductivity. The obtained core-shell nanostructure material possesses a high contact area, excellent synergistic effect and can provide more reactive active sites. The prepared CMs@Ni(OH) 2 /NiSe shows a higher specific capacitance (2106 F g À 1 ) and excellent cycling performance with a capacitance retention of 95 % after 30000 cycles. Furthermore, the assembled CMs@Ni(OH) 2 /NiSe//AC device delivers a high energy density of 70.84 Wh kg À 1 at the power density of 756.8 W kg À 1 and maintains 100 % of the initial capacitance after 40000 cycles.

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Rational design of cobalt–nickel double hydroxides for flexible asymmetric supercapacitor with improved electrochemical performance

Cited by 104 publications

References 56 publications

Hierarchical Cobalt‐Nickel Double Hydroxide Arrays Assembled on Naturally Sedimented Ti₃C₂T_x for High‐Performance Flexible Supercapacitors

Hierarchical Cobalt‐Nickel Double Hydroxide Arrays Assembled on Naturally Sedimented Ti₃C₂T_x for High‐Performance Flexible Supercapacitors

Polyaniline/Small‐Sized MXene/Carbon Cloth Electrodes with 3D Hierarchical Porous Structure for All‐Solid‐State Flexible Supercapacitors

Ni(OH)₂/NiSe Nanoparticles Supported on Carbon Microspheres for Long‐Life and High‐Performance Asymmetric Supercapacitors

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Rational design of cobalt–nickel double hydroxides for flexible asymmetric supercapacitor with improved electrochemical performance

Cited by 104 publications

References 56 publications

Hierarchical Cobalt‐Nickel Double Hydroxide Arrays Assembled on Naturally Sedimented Ti3C2Tx for High‐Performance Flexible Supercapacitors

Hierarchical Cobalt‐Nickel Double Hydroxide Arrays Assembled on Naturally Sedimented Ti3C2Tx for High‐Performance Flexible Supercapacitors

Polyaniline/Small‐Sized MXene/Carbon Cloth Electrodes with 3D Hierarchical Porous Structure for All‐Solid‐State Flexible Supercapacitors

Ni(OH)2/NiSe Nanoparticles Supported on Carbon Microspheres for Long‐Life and High‐Performance Asymmetric Supercapacitors

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Hierarchical Cobalt‐Nickel Double Hydroxide Arrays Assembled on Naturally Sedimented Ti₃C₂T_x for High‐Performance Flexible Supercapacitors

Hierarchical Cobalt‐Nickel Double Hydroxide Arrays Assembled on Naturally Sedimented Ti₃C₂T_x for High‐Performance Flexible Supercapacitors

Ni(OH)₂/NiSe Nanoparticles Supported on Carbon Microspheres for Long‐Life and High‐Performance Asymmetric Supercapacitors