Reduced graphene oxide/polyaniline electrochemical supercapacitors fabricated by laser

Ladrón-de-Guevara, Antonio; Boscá, Alberto; Pedrós, J.; Climent‐Pascual, Esteban; Andrés, A. de; Calle, F.; Martínez, Javier López

doi:10.1016/j.apsusc.2018.10.194

Cited by 51 publications

(27 citation statements)

References 49 publications

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“…This morphology can be related to rapid-mixing polymerization. This methodology can control the secondary growth of Pani, avoiding the growth of irregular structures, i.e., agglomerates [25]. As can be seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Doped Pani was synthesized in the presence of graphite nanolayers by rapid-mixing polymerization using hydrochloric acid as dopant and ammonium persulfate (APS) as oxidant, according to the process adapted from the literature [25,26]. In a typical polymerization reaction, GNL (5 and 20 wt% relative to the weight of aniline) and aniline (0.6 mL) were dispersed in 1.0 M hydrochloric acid aqueous solution (20 mL).…”

Section: Synthesis and Characterization Of The Nanocomposites Polymentioning

confidence: 99%

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Thermal aging of polyaniline/grafite nanolayers nanocomposites

Matte¹,

Moura²,

Gonçalves³

et al. 2019

IJEAS

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In this work we investigate the behavior of the electrical conductivity of polyaniline when small amounts of graphite nanolayers are added to the polymeric matrix and subsequently suffer an aging process. We observed that graphite tends to increase conductivity whilst aging tends to decrease it. On the other hand, absorption of atmospheric humidity tends to increase conductivity. We show that a mathematical model describes with good agreement the dependence of the conductivity with the aging time.

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Section: Resultsmentioning

confidence: 99%

Section: Synthesis and Characterization Of The Nanocomposites Polymentioning

confidence: 99%

Thermal aging of polyaniline/grafite nanolayers nanocomposites

Matte¹,

Moura²,

Gonçalves³

et al. 2019

IJEAS

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show abstract

“…So it has been indeed observed for fast pulse voltages (<15 V in the order of tens of ms). But for longer exposure times (up to s), a lateral expansion of a very thin oxide layer is actually evidenced, which progress unavoidably, spoiling the aspect ratio of the features . In fact, it will be confirmed later that the disc‐shaped oxidized region in graphene expands much more than expected according to the estimated dimensions of the water meniscus around the tip …”

Section: Introductionmentioning

confidence: 82%

New Concepts for Production of Scalable Single Layer Oxidized Regions by Local Anodic Oxidation of Graphene

Quesada

Borrás

García-Vélez

et al. 2019

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A deep comprehension of the local anodic oxidation process in 2D materials is achieved thanks to an extensive experimental and theoretical study of this phenomenon in graphene. This requires to arrange a novel instrumental device capable to generate separated regions of monolayer graphene oxide (GO) over graphene, with any desired size, from micrometers to unprecedented mm2, in minutes, a milestone in GO monolayer production. GO regions are manufactured by overlapping lots of individual oxide spots of thousands µm2 area. The high reproducibility and circular size of the spots allows not only an exhaustive experimental characterization inside, but also establishing an original model for oxide expansion which, from classical first principles, overcomes the traditional paradigm of the water bridge, and is applicable to any 2D‐material. This tool predicts the oxidation behavior with voltage and exposure time, as well as the expected electrical current along the process. The hitherto unreported transient current is measured during oxidation, gaining insight on its components, electrochemical and transport. Just combining electrical measurements and optical imaging estimating carrier mobility and degree of oxidation is possible. X‐ray photoelectron spectroscopy reveals a graphene oxidation about 30%, somewhat lower to that obtained by Hummers' method.

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“…Ultracapacitors (UCs) are currently gaining attention rapidly as a new type of energy-storage component with a higher density than ordinary capacitance and longer cycle life than batteries [1,2]. However, its energy storage principle determines its capacity cannot temporarily surpass the battery [3].…”

Section: Introductionmentioning

confidence: 99%

Fractional-Order Modeling and Parameter Identification for Ultracapacitors with a New Hybrid SOA Method

et al. 2019

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This paper deals with an ultracapacitor (UC) model and its identification procedure. To take UC’s fractional characteristic into account, two constant phase elements (CPEs) are used to construct a model structure according to impedance spectrum analysis. The different behaviors of UC such as capacitance, resistance, and charge distribution dynamics are simulated by the corresponding part in the model. The resistance under different voltages is calculated through the voltage rebound method to explore its non-linear characteristics and create a look-up table. A nonlinear fractional model around an operation voltage is then deduced by applying the resistance table. This time identification is carried by a proposed hybrid optimization algorithm: Nelder-Mead seeker algorithm (NMSA), which embeds the Nelder–Mead Simplex (NMS) method into the seeker optimization algorithm (SOA). Its time behavior has been compared with the linear fractional model for charging and discharging current profiles at different levels.

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Reduced graphene oxide/polyaniline electrochemical supercapacitors fabricated by laser

Cited by 51 publications

References 49 publications

Thermal aging of polyaniline/grafite nanolayers nanocomposites

Thermal aging of polyaniline/grafite nanolayers nanocomposites

New Concepts for Production of Scalable Single Layer Oxidized Regions by Local Anodic Oxidation of Graphene

Fractional-Order Modeling and Parameter Identification for Ultracapacitors with a New Hybrid SOA Method

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