Improvement of the capacitive performances for Co–Al layered double hydroxide by adding hexacyanoferrate into the electrolyte

L, Su; Zhang, Xiaogang; Mi, Changhuan; Gao, Bo; Liu, Yan

doi:10.1039/b814844a

Cited by 201 publications

(122 citation statements)

References 38 publications

(37 reference statements)

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“…pseudocapacitive) or batterylike, such as MnO 2 , 8 NiO, 14 conducting polymers e.g. polyaniline, 27 Co-Al layered double hydroxide, 30 and chalcogenides e.g. CuS, 32 there can be direct electron transfer between the electrode material and the redox species in the electrolyte.…”

Section: Mechanisms Of Charge Storage In Supercapacitors Containing Rmentioning

confidence: 99%

“…3,4,26 Also, if the electrode material displays pseudocapacitance or non-capacitive activity, the electron transfer reactions occurring in the lattice of the electrode could be shuttled by the redox species of the electrolyte. 14,30 In order for the SC with a redox electrolyte to display satisfactory stability in repeated charging-discharging cycles, it is important for the redox specie to show fast and reversible electrochemical activity in the supporting electrolyte. It could be ensured by matching the concentration of the redox species to the supporting electrolyte.…”

Section: Mechanisms Of Charge Storage In Supercapacitors Containing Rmentioning

confidence: 99%

“…For example, the charge storage obtained from the redox activity of the Fe(CN) 6 3− /Fe(CN) 6 4− couple in KOH, has been shown to be highly dependent on the concentrations of both the added K 3 Fe(CN) 6 and K 4 Fe(CN) 6 , and the supporting electrolyte KOH. 13,30 The physicochemical properties of the redox species (e.g. ion-solvent interactions) and their interrelationship to charge storage properties (e.g.…”

Section: Mechanisms Of Charge Storage In Supercapacitors Containing Rmentioning

confidence: 99%

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Redox Electrolytes in Supercapacitors

Akinwolemiwa

Peng

Chen

2015

J. Electrochem. Soc.

439

257

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Most methods for improving supercapacitor performance are based on developments of electrode materials to optimally exploit their storage mechanisms, namely electrical double layer capacitance and pseudocapacitance. In such cases, the electrolyte is supposed to be electrochemically as inert as possible so that a wide potential window can be achieved. Interestingly, in recent years, there has been a growing interest in the investigation of supercapacitors with an electrolyte that can offer redox activity. Such redox electrolytes have been shown to offer increased charge storage capacity, and possibly other benefits. There are however some confusions, for example, on the nature of contributions of the redox electrolyte to the increased storage capacity in comparison with pseudocapacitance, or by expression of the overall increased charge storage capacity as capacitance. This report intends to provide a brief but critical review on the pros and cons of the application of such redox electrolytes in supercapacitors, and to advocate development of the relevant research into a new electrochemical energy storage device in parallel with, but not the same as that of supercapacitors.

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Section: Mechanisms Of Charge Storage In Supercapacitors Containing Rmentioning

confidence: 99%

Section: Mechanisms Of Charge Storage In Supercapacitors Containing Rmentioning

confidence: 99%

Section: Mechanisms Of Charge Storage In Supercapacitors Containing Rmentioning

confidence: 99%

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Redox Electrolytes in Supercapacitors

Akinwolemiwa

Peng

Chen

2015

J. Electrochem. Soc.

439

257

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“…LDHs are candidates for nextgeneration electrode materials of supercapacitors because of their abundant slabs and the electrochemically active sites that led to the simultaneous formation of the electrical double-layered capacitance and Faradaic pseudocapacitance. Recently, several groups dedicated to study the electrochemical properties of CoAl-LDH or NiAl-LDH [22][23][24][25][26][27][28][29][30]. However, pure LDH usually stacks together during the synthesized process or its low conductivity constrains electron transfer; these consequently impact on the performance of electrode materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation and capacitance properties of graphene/NiAl layered double-hydroxide nanocomposite

Wang

Zhang

Wang

et al. 2013

Journal of Colloid and Interface Science

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a b s t r a c tGraphene/NiAl layered double-hydroxide (LDH) composite with high capacitive properties has been prepared in a friendly one-step process. It is found that NiAl-LDH is formed in the addition of precipitator agent (NaOH and NaNO 3 ) by hydrothermal method, at the same time graphene oxide (GO) is reduced to graphene. The morphology and structure of the obtained material are examined by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), transmission electron microscope (TEM), and scanning electron microscope (SEM) techniques. It is revealed that the NiAl-LDH disperses well on the surface of graphene and the formation of NiAl-LDH nanoparticles is beneficial to the peeling of graphene (RGO). More importantly, the addition of NiAl-LDH to graphene endows the materials with desirable specific surface areas and higher porosity. These structural advantages result in higher specific capacitance compared with pristine graphene. Electrochemical property investigations show that the graphene/NiAl-LDH had a higher specific capacitance than graphene.Crown

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“…Adding the redox additive to electrolyte is an emerging pattern to enhance the electrochemical performance, which has been applied by Su et al using Fe(CN) 6 3´/ Fe(CN) 6 4´i ons as an additive [40].…”

Section: Introductionmentioning

confidence: 99%

High Specific Capacitance of Polyaniline/Mesoporous Manganese Dioxide Composite Using KI-H2SO4 Electrolyte

Jiang

et al. 2015

Polymers

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Abstract:The PANI/Mesoporous MnO 2 composites were prepared through a simple one step method and we introduced the KI-H 2 SO 4 solution as the electrolyte of PANI/MnO 2 composites creatively. The characterization of structure, morphology, and composition are obtained by X-ray diffraction, Fourier transform infrared spectroscopy, thermal gravity analysis, Raman spectra, and scanning electron microscope. The electrochemical performances were investigated by constant-current charge-discharge, the voltammetry curve, and alternating current (AC) impedance technique. The specific capacitance of composites is 1405 F/g, which is almost 10 times larger than MnO 2 (158 F/g). We also find that the iodide concentration is closely related to the specific capacitance. Therefore, we explored the specific capacitance at different iodide concentration (0.05, 0.1, 0.2, 0.5, and 1 M), the results indicated that the specific capacitance reached a maximum value (1580 F/g) at 0.5 mol/L. Additionally, the PANI/Mesoporous MnO 2 composites not only exhibited a good ratio discharge property (857 F/g) at high current density, but also revealed an excellent cycling stability after 500 cycles, which retained 90% of the original specific capacitance.

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Improvement of the capacitive performances for Co–Al layered double hydroxide by adding hexacyanoferrate into the electrolyte

Cited by 201 publications

References 38 publications

Redox Electrolytes in Supercapacitors

Redox Electrolytes in Supercapacitors

Preparation and capacitance properties of graphene/NiAl layered double-hydroxide nanocomposite

High Specific Capacitance of Polyaniline/Mesoporous Manganese Dioxide Composite Using KI-H2SO4 Electrolyte

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