Electrosynthesis of Ni/Al layered double hydroxide and reduced graphene oxide composites for the development of hybrid capacitors

Musella, Elisa; Gualandi, Isacco; Ferrari, Giacomo; Mastroianni, Davide; Scavetta, Erika; Giorgetti, Marco; Migliori, Andrea; Christian, Meganne; Morandi, Vittorio; Denecke, R.; Gazzano, Massimo; Tonelli, Domenica

doi:10.1016/j.electacta.2020.137294

Cited by 22 publications

(10 citation statements)

References 79 publications

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“…Electrochemical capacitors, also known as supercapacitors, have attracted great interest as electrochemical energy storage devices because of their fast energy delivery, high power density, environmental friendliness, and long cycle life. − According to the charge storage mechanisms, supercapacitors can be generally divided into two categories: electrical double layer capacitors and Faraday pseudocapacitors. − In general, Faraday pseudocapacitors can provide superior specific capacitance by utilizing fast and reversible electrochemical redox reactions. − In order to improve the specific capacitance of supercapacitors, substantial effort has been focused on investigating the pseudocapacitive performance of metal oxides, metal sulfides, metal hydroxides, and conductive polymers. − As a kind of metal hydroxide, nickel-aluminum layered double hydroxides (Ni-Al LDHs) have broad application prospects as supercapacitor materials. − Compared with other LDH electrode materials (such as Ni-Co LDHs, Ni-Mn LDHs, and Co-Al LDHs), Ni-Al LDHs have an ultrahigh specific surface area, environmental performance, and low cost. − Li et al reported Ni(OH) 2 -NiAl LDH with a specific capacity of 2123 F g –1 at a current density of 0.5 A g –1 . Huang et al .…”

Section: Introductionmentioning

confidence: 99%

Dynamic Changes of Ni-Al LDH Nanosheets under Potential Cycling Investigated by In Situ Electrochemical Atomic Force Microscopy

Guan

Qin

Guo

et al. 2022

ACS Appl. Energy Mater.

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Nickel-aluminum layered double hydroxides (Ni-Al LDHs) are widely used in energy storage and conversion devices, and the impact of the Ni/Al molar ratio on the structural evolution and kinetic process is of great significance for improving reaction kinetics and efficiency. In this paper, the morphological evolutions and nanomechanical property changes of Ni-Al-n LDH (n is the Ni/Al molar ratio) nanosheets during potential cycling were explored by in situ electrochemical atomic force microscopy. The conversion of Ni2+ into Ni3+ and the amphoteric properties of Al3+ during potential cycling resulted in the dissolution of Ni-Al-n LDH nanosheets. The dissolution rate of Ni-Al-2 LDH nanosheets was slower than those of Ni-Al-2.5 LDH and Ni-Al-3 LDH nanosheets. Meanwhile, the Young’s modulus value of the dissolved area was much larger than that of the undissolved area, and the dissolved area exhibited a harder property. It was attributed to the different microcrystalline structures of Ni-Al LDH nanosheets affected by the Ni/Al molar ratio and the rearrangement of Ni2+ and Al3+ during the reaction. The slow dissolution of Ni-Al-2 LDH nanosheets was beneficial to improving the electrochemical performance, while the fast dissolution of Ni-Al-2.5 LDH and Ni-Al-3 LDH nanosheets was not conducive to the electrochemical performance. Understanding the effect of the Ni/Al molar ratio on the morphological evolutions and nanomechanical property changes of Ni-Al LDH nanosheets during potential cycling has important guiding significance for the subtle compositional modification and structural design of Ni-Al LDHs as an electrode material.

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Section: Introductionmentioning

confidence: 99%

Dynamic Changes of Ni-Al LDH Nanosheets under Potential Cycling Investigated by In Situ Electrochemical Atomic Force Microscopy

Guan

Qin

Guo

et al. 2022

ACS Appl. Energy Mater.

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“…Note that the negative applied potential also reduces the GO to rGO. [ 13 ] Considering that the general formula of LDHs is: [ 14 ]

\begin{equation}{[M_{1 - x}^{II}M_x^{III}{\left( {OH} \right)}_2]}^{x + }{\left[ {A_{x/n}^{n - }} \right]}^{x - }.y{H}_2O\end{equation}

such a structure is known as a pure LDH when 0.2 ≤ x ≤ 0.33. [ 15 ] Outside this range, either larger or smaller x values, may result in the precipitation of metals as individual metal hydroxides.…”

Section: Resultsmentioning

confidence: 99%

“…The presence of C 1s in the spectrum of LDH originates from the carbon contaminants. [ 13 ] Figures S4–S6 (Supporting Information) display the core level XPS spectra of Ni, Co, and Fe of the pure Ni‐Co‐Fe LDH phase. The core level XPS spectrum of Ni 2p (Figure S4, Supporting Information) consists of two main peaks at 855.2 (Ni 2p 3/2 ) and 872.8 eV (Ni 2p 1/2 ), along with two shake‐up satellites (denoted as Sat.)…”

Section: Resultsmentioning

confidence: 99%

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Partial Sulfidation of the Electrochemically Exfoliated Layered Double Hydroxides toward Advanced Aqueous Zinc Batteries

Yousefzadeh,

Noori,

Rahmanifar

et al. 2023

Advanced Energy Materials

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Aqueous zinc‐based batteries are a promising alternative to lithium batteries. These batteries, however, persistently suffer from uncontrollable dendrite growth and sustained water consumption at the Zn anodes, along with low and often fading capacity at the cathodes. Herein, Zn metal is simply encapsulated into a chitosan‐containing polymer gel that not only suppresses hydrogen evolution but also enables dendrite‐free Zn plating/stripping. A binder‐free cathode based on the electrochemically exfoliated and partially sulfidated Ni–Co–Fe layered double hydroxide‐reduced graphene oxide (SNS‐rGO) nanocomposite is also reported. The fabricated devices (based on either Zn or chitosan‐coated Zn) deliver near record‐high values of specific capacity (756 mA h g−1cathode at 1 A g−1) and specific energy (1284 W h kg−1cathode), along with an outstanding specific power (108 kW kg−1cathode), an excellent output voltage (up to 1.9 V), and prolonged cycling stability at 100% depth‐of‐discharge. This interface engineering strategy, supported by the density functional theory calculations, provides a solid basis for further practical applications of aqueous Zn batteries.

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“…IR and Raman analyses are not considered diagnostic tools for LDHs, but they are widely employed to identify the presence of foreign anions in the interlayer among the brucite-like sheets as well as to gather information about the bonds formed by the anions, and about their orientations [ 1 , 41 , 42 , 43 , 44 ]. Consequently, these techniques are almost always used in combination with others: for example Yang et al [ 45 ] studied the adsorption mechanisms of Cr(VI) by a LDH intercalated with EDTA through a multi-approaches analysis which involved XRD, FTIR, X-ray photoelectron spectroscopy (XPS), and zeta potential analysis.…”

Section: Characterizationmentioning

confidence: 99%

Synthesis and Characterization of Layered Double Hydroxides as Materials for Electrocatalytic Applications

et al. 2021

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Layered double hydroxides (LDHs) are anionic clays which have found applications in a wide range of fields, including electrochemistry. In such a case, to display good performances they should possess electrical conductivity which can be ensured by the presence of metals able to give reversible redox reactions in a proper potential window. The metal centers can act as redox mediators to catalyze reactions for which the required overpotential is too high, and this is a key aspect for the development of processes and devices where the control of charge transfer reactions plays an important role. In order to act as redox mediator, a material can be present in solution or supported on a conductive support. The most commonly used methods to synthesize LDHs, referring both to bulk synthesis and in situ growth methods, which allow for the direct modification of conductive supports, are here summarized. In addition, the most widely used techniques to characterize the LDHs structure and morphology are also reported, since their electrochemical performance is strictly related to these features. Finally, some electrocatalytic applications of LDHs, when synthesized as nanomaterials, are discussed considering those related to sensing, oxygen evolution reaction, and other energy issues.

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Electrosynthesis of Ni/Al layered double hydroxide and reduced graphene oxide composites for the development of hybrid capacitors

Cited by 22 publications

References 79 publications

Dynamic Changes of Ni-Al LDH Nanosheets under Potential Cycling Investigated by In Situ Electrochemical Atomic Force Microscopy

Dynamic Changes of Ni-Al LDH Nanosheets under Potential Cycling Investigated by In Situ Electrochemical Atomic Force Microscopy

Partial Sulfidation of the Electrochemically Exfoliated Layered Double Hydroxides toward Advanced Aqueous Zinc Batteries

Synthesis and Characterization of Layered Double Hydroxides as Materials for Electrocatalytic Applications

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