Polyaniline nanofiber sponge filled graphene foam as high gravimetric and volumetric capacitance electrode

Pedrós, J.; Boscá, Alberto; Martínez, Javier López; Ruiz-Gómez, Sandra; Pérez, Lucas; Barranco, Violeta; Calle, F.

doi:10.1016/j.jpowsour.2016.03.041

Cited by 51 publications

(19 citation statements)

References 39 publications

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“…Graphene is an exciting material of 21st century, which have oneatom-thick 1D planar sheet of sp 2 -bonded carbon atoms in a honeycomb crystal lattice with exceptionally high crystal quality and electronic properties which has emerged as a rapidly rising star in the field of material science [1][2][3][4][5] . It is also known as mother element of carbon allotropes, including graphite, carbon nanotubes, and fullerenes 3,6 .…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide: strategies for synthesis, reduction and frontier applications

2016

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Till now, several innovative methods have been developed for the synthesis of graphene materials including mechanical exfoliation, epitaxial growth by chemical vapor deposition, chemical reduction of graphite oxide, liquid-phase exfoliation, arc discharge of graphite, in situ electron beam irradiation, epitaxial growth on SiC, thermal fusion, laser reduction of polymers sheets and unzipping of carbon nanotubes etc. Generally large scale graphene nanosheets are reliably synthesized utilising other forms of graphene-based novel materials, including graphene oxide (GO), exfoliated graphite oxide (by thermal and microwave), and reduced graphene oxide. The degree of GO reduction and number of graphene layers are minimized mainly by applying two approaches via chemical or thermal treatments. The promising and excellent properties together with the ease of processibility and chemical functionalization makes graphene based materials specially GO, ideal candidates for incorporation into a variety of advanced functional materials. Chemical functionalization of graphene can be easily achieved, by the introduction of various functional groups. These functional groups help to control and manipulate the graphene surfaces and help to tune the properties of the resulting hybrid materials. Importantly, graphene and its derivatives GO, have been explored in a wide range of applications, such as energy generation/storage, optical devices, electronic and photonic devices, drug delivery, clean energy, and chemical/bio sensors. In this review article, we have incorporated general introduction of GO, their synthesis, reduction and some selected frontier applications.

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Section: Introductionmentioning

confidence: 99%

Graphene oxide: strategies for synthesis, reduction and frontier applications

2016

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“…It is possible to observe an almost symmetrical non-linear GCDC for all modified electrodes, indicating a good reversibility upon the redox process, as also depicted by the CV results, and the pseudocapacitance behavior. 35 It was also observed that an increase in the current density provokes a diminishment of the discharge time. In this way, the areal specific capacitance (C S ) of the modified electrodes were calculated accordingly to equation 1, as described elsewhere.…”

Section: Methodsmentioning

confidence: 97%

Nickel-Copper Alloys Modified Electrodes: an Electrochemical Study on their Interfacial and Supercapacitive Properties

Wolfart¹,

Brito²,

Marchesi³

et al. 2017

J. Braz. Chem. Soc.

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In this manuscript, we report the electrodeposition of nickel-copper alloys in a two steps methodology. Firstly, the copper electrode is oxidized to generate Cu 2+ ions followed by the reduction of both Ni 2+ and Cu 2+. The electrodes were further cycled in KOH to convert the metallic alloy into the respective electroactive hydroxide. This methodology created an electrode with high roughness and distinct electrochemical behavior. The modified electrodes were also characterized by electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Finally, the modified electrodes were studied in their supercapacitive properties by galvanostatic charge and discharge curves; the electrodes showed a good specific capacitance of 58 mF cm -2 . The results indicated a new strategy using a simple methodology to modified Cu-electrodes to develop supercapacitors at low cost. Keywords: nickel-copper hydroxides, supercapacitors, electrodeposition, interfacial properties IntroductionNowadays, the worldwide demand for energy impacts the research in new energy storage and conversion devices where it is intended an enhanced efficiency, low-cost and eco-friendly alternative.1-3 Among them, supercapacitors (SCs) arise as a good alternative due to their ease-preparation, long cycle life and fast and reversible redox reactions. [4][5][6] Supercapacitors, ultracapacitors or electrochemical capacitors are devices that combine the power delivery presented in the capacitors and the energy density presented by the batteries. 7 Based on the charge storage mechanism, supercapacitors can be divided into two categories: electrochemical doublelayer capacitors (EDLCs), where the capacitance arises from the charge accumulated at the electrode/electrolyte interface. Carbonaceous materials such as graphene and carbon nanotubes are typical examples vastly employed in EDLCs. 8,9 The second one are the pseudocapacitors, which the charge storage mechanism is based on both double layer capacitance and fast redox reactions at the electrode/electrolyte interface, increasing the overall density of current produced. Typical pseudocapacitors materials are transition metals oxide/hydroxide (TMOH) and conducting polymers. [10][11][12] Amongst the different TMOH used as supercapacitors electrodes, RuO 2 is by far one of the most investigated material due to its high theoretical specific capacitance, long cycle life and rate capability, electrochemical properties and conductivity. 13 However, its high-cost and scarcity is the main drawback related to RuO 2 based materials in commercial devices. In this way, in order to obtain more attractive materials, TMOH alloys based on low-cost metals have been extensively studied.14 Shinde et al.15 studied the incorporation of Mn in CuO/Cu(OH) 2 by successive ionic layer adsorption and reaction (SILAR) technique. The authors have found an improved specific capacitance of 600 F g -1 for the doped material that was ascribed to a change in the morphology occasioned by the Mn doping effect.Another TMOH of i...

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“…9a, b) [84,85]. Pedros et al [86] reported the controllable electrode position of PANI to fill the pores of CVD-prepared graphene foams and also obtained a high volumetric capacitance. We further introduced the pseudo-capacitive metal oxide (ruthenium oxide, RuO 2 ) into a 3D dense graphene network to Fig.…”

Section: Graphene Monoliths With 3d Networkmentioning

confidence: 99%

Engineering Graphenes from the Nano- to the Macroscale for Electrochemical Energy Storage

Han

Wei

Zhang

et al. 2018

Electrochem. Energ. Rev.

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Carbon is a key component in current electrochemical energy storage (EES) devices and plays a crucial role in the improvement in energy and power densities for the future EES devices. As the simplest carbon and the basic unit of all sp 2 carbons, graphene is widely used in EES devices because of its fascinating and outstanding physicochemical properties; however, when assembled in the macroscale, graphene-derived materials do not demonstrate their excellence as individual sheets mostly because of unavoidable stacking. This review proposal shows to engineer graphene nanosheets from the nano-to the macroscale in a well-designed and controllable way and discusses how the performance of the graphene-derived carbons depends on the individual graphene sheets, nanostructures, and macrotextures. Graphene-derived carbons in EES applications are comprehensively reviewed with three representative devices, supercapacitors, lithium-ion batteries, and lithium-sulfur batteries. The review concludes with a comment on the opportunities and challenges for graphene-derived carbons in the rapidly growing EES research area.

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Polyaniline nanofiber sponge filled graphene foam as high gravimetric and volumetric capacitance electrode

Cited by 51 publications

References 39 publications

Graphene oxide: strategies for synthesis, reduction and frontier applications

Graphene oxide: strategies for synthesis, reduction and frontier applications

Nickel-Copper Alloys Modified Electrodes: an Electrochemical Study on their Interfacial and Supercapacitive Properties

Engineering Graphenes from the Nano- to the Macroscale for Electrochemical Energy Storage

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