Synthesis of graphene oxide-intercalated α-hydroxides by metathesis and their decomposition to graphene/metal oxide composites

Nethravathi, C.; Rajamathi, Michael; Ravishankar, N.; Basit, Lubna; Felser, Claudia

doi:10.1016/j.carbon.2010.07.047

Cited by 40 publications

(37 citation statements)

References 40 publications

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“…In all the spectra, an intense and broad adsorption band at 3359-3436 cm -1 corresponds to the stretching vibration of hydrogen bonded hydroxyl groups (ν O-H ) from all the samples. [28][29][30][31][32][33][34] The O-H bending vibration of the interlayer water is also observed at 1620-1650 cm -1 and 1589-1596 cm -1 for the product A-Co-Ni H prepared at starting ratio of 1:1 and all the EG-Co-Ni LDHs, respectively. After all, part of water can still intercalate into the layer of the samples due to the mixtured reaction system of EG and water.…”

Section: Resultsmentioning

confidence: 72%

Ethylene Glycol Intercalated Cobalt/Nickel Layered Double Hydroxide Nanosheet Assemblies with Ultrahigh Specific Capacitance: Structural Design and Green Synthesis for Advanced Electrochemical Storage

Wang

Zhang

et al. 2015

ACS Appl. Mater. Interfaces

106

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Because of the rapid depletion of fossil fuels and severe environmental pollution, more advanced energy-storage systems need to possess dramatically improved performance and be produced on a large scale with high efficiency while maintaining low-enough costs to ensure the higher and wider requirements. A facile, energy-saving process was successfully adopted for the synthesis of ethylene glycol intercalated cobalt/nickel layered double hydroxide (EG-Co/Ni LDH) nanosheet assembly variants with higher interlayer distance and tunable transitional-metal composition. At an optimized starting Co/Ni ratio of 1, the nanosheet assemblies display a three-dimensional, spongelike network, affording a high specific surface area with advantageous mesopore structure in 2-5 nm containing large numbers of about 1.2 nm micropores for promoting electrochemical reaction. An unprecedented electrochemical performance was achieved, with a specific capacitance of 4160 F g(-1) at a discharge current density of 1 A g(-1) and of 1313 F g(-1) even at 50 A g(-1), as well as excellent cycling ability. The design and optimization of EG-Co/Ni LDH nanosheets in compositions, structures, and performances, in conjunction with the easy and relatively "green" synthetic process, will play a pivotal role in meeting the needs of large-scale manufacture and widespread application for advanced electrochemical storage.

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Section: Resultsmentioning

confidence: 72%

Ethylene Glycol Intercalated Cobalt/Nickel Layered Double Hydroxide Nanosheet Assemblies with Ultrahigh Specific Capacitance: Structural Design and Green Synthesis for Advanced Electrochemical Storage

Wang

Zhang

et al. 2015

ACS Appl. Mater. Interfaces

106

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“…(i) Surfactant-intercalated α-derivative structures α-Ni(OH) 2 -like materials in which the intercalated water is replaced with surfactant molecules have been prepared using cetyltrimethylammonium bromide [100], dodecyl sulfate [82,92,[100][101][102][103][104][105][106], dodecylbenzene sulfonate [103], p-aminobenzoate [18] and Tween 80 [100]. The polar or ionic regions of the surfactant molecules interact with the Ni(OH) 2 sheets and the non-polar regions fill the interlayer space.…”

Section: (C) α-Derivative Structuresmentioning

confidence: 99%

Nickel hydroxides and related materials: a review of their structures, synthesis and properties

et al. 2015

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This review article summarizes the last few decades of research on nickel hydroxide, an important material in physics and chemistry, that has many applications in engineering including, significantly, batteries. First, the structures of the two known polymorphs, denoted as α-Ni(OH) 2 and β-Ni(OH) 2 , are described. The various types of disorder, which are frequently present in nickel hydroxide materials, are discussed including hydration, stacking fault disorder, mechanical stresses and the incorporation of ionic impurities. Several related materials are discussed, including intercalated α-derivatives and basic nickel salts. Next, a number of methods to prepare, or synthesize, nickel hydroxides are summarized, including chemical precipitation, electrochemical precipitation, sol-gel synthesis, chemical ageing, hydrothermal and solvothermal synthesis, electrochemical oxidation, microwaveassisted synthesis, and sonochemical methods. Finally, the known physical properties of the nickel hydroxides are reviewed, including their magnetic, vibrational, optical, electrical and mechanical properties. The last section in this paper is intended to serve as a summary of both the potentially useful properties of these materials and the methods for the identification and characterization of 'unknown' nickel hydroxide-based samples.

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“…To answer this, one may consider the unusual nature of α-Ni(OH) 2 , especially its tendency to form unique layered structures. There are numerous literature reports of α-type nickel hydroxides intercalated with organic anions, including cetyltrimethylammonium bromide, 54 dodecyl sulfate, 9,54-61 dodecylbenzene sulfonate, 59 p-aminobenzoate, 62 and Tween 80. 54 Several of these intercalation materials maintain the lattice vibrational modes of the α-Ni(OH) 2 parent structure.…”

Section: Metal Oxidesmentioning

confidence: 99%

An Oxalate Method for Measuring the Surface Area of Nickel Electrodes

Hall

Bock

MacDougall

2014

J. Electrochem. Soc.

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This work establishes a new method to measure the electrochemically active surface area (A ECSA ) of nickel electrodes, in situ. The addition of 0.08 mol L −1 of an oxalate salt to an alkaline electrolyte solution shifts the half-wave potential of the Ni(II)/Ni(III) redox pair by about −80 mV. Further, these peaks are very narrow. The sharpest peak in this work has a full width at half maximum (FWHM) of just 11 mV. This unusual sharpness is attributed to the layered structure of nickel hydroxides and the adsorption of oxalate from the solution on the (001) surface. This is supported by attenuated total reflectance infrared (ATR-IR) peaks measured at 1265 cm −1 , 1655 cm −1 , and 1713 cm −1 , which correspond to mononuclear bidentate oxalate bonded to nickel. At sufficiently fast potential scan rates (≥150 mV s −1 ), the adsorbed oxalate limits growth of the surface hydroxide to a single layer. During the reverse scan, the surface NiOOH/Ni(OH) 2 reduction peak is well-separated from other electrochemical processes and may be used to accurately and precisely measure the A ECSA . The error of this method is estimated at < 10%.

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Synthesis of graphene oxide-intercalated α-hydroxides by metathesis and their decomposition to graphene/metal oxide composites

Cited by 40 publications

References 40 publications

Ethylene Glycol Intercalated Cobalt/Nickel Layered Double Hydroxide Nanosheet Assemblies with Ultrahigh Specific Capacitance: Structural Design and Green Synthesis for Advanced Electrochemical Storage

Ethylene Glycol Intercalated Cobalt/Nickel Layered Double Hydroxide Nanosheet Assemblies with Ultrahigh Specific Capacitance: Structural Design and Green Synthesis for Advanced Electrochemical Storage

Nickel hydroxides and related materials: a review of their structures, synthesis and properties

An Oxalate Method for Measuring the Surface Area of Nickel Electrodes

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