Degradation-induced capacitance: a new insight into the superior capacitive performance of polyaniline/graphene composites

Zhang, Qin’e; Zhou, Anan; Wang, Jingjing; Wu, Jifeng; Bai, Hua

doi:10.1039/c7ee02018j

Cited by 160 publications

(81 citation statements)

References 55 publications

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“…Conducting polymers, such as polyaniline (PANI), are widely studied due to their ease of preparation, good level of electrical conductivity, redox and ion-exchange properties, and environmental stability [1][2][3][4][5][6][7][8]. However, the understanding of the stability and the mechanism of degradation of polyaniline is of great importance for possible applications [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Writing in a Polyaniline Film with Laser Beam and Stability of the Record: A Raman Spectroscopy Study

Morávková

Bober

2018

International Journal of Polymer Science

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Lines were drawn on polyaniline (PANI) salt films with laser beam, and then the samples were left to age in air at room temperature. Both the irradiated and intact parts of the sample and their ageing were studied with Raman spectroscopy. It was found that the laser-written record is reasonably stable. The degradation of polyaniline by laser irradiation and ageing was compared to the changes in PANI during heating. In all cases, deprotonation and crosslinking of PANI chains proceed but the relative rates of the processes vary with degradation conditions. Materials and Methods2.1. Preparation of PANI Films. Polyaniline was prepared by the oxidation of 0.2 M aniline hydrochloride (Fluka, Switzerland) with 0.25 M ammonium peroxydisulfate (APS) (Lach-Ner, Czech Republic) in water [23] at room temperature. The films were deposited in situ on glass and goldcoated glass windows, 13 mm in diameter. A couple of films

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Section: Introductionmentioning

confidence: 99%

Writing in a Polyaniline Film with Laser Beam and Stability of the Record: A Raman Spectroscopy Study

Morávková

Bober

2018

International Journal of Polymer Science

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“…As previously indicated the increase of the particle size of NH occurs as a result of stress generation during transformation between α and β-Ni(OH) 2 . 33 Presence of PANI network in the structure is expected to compensate the generated stress during this conversion. 8 However, the decrease of charge tranfer resistance (R ct ) for the composite electrode which was contrary to the behaviour of PANI and NH electrodes (Table 3) could not only be explained by the morphological and structural changes induced by this combination.…”

Section: Discussionmentioning

confidence: 99%

“…Additionally the appearence of the bands located at 1373, 1481, 1582, 1623 cm −1 was related to the presence of less conductive fully oxidized PE phase or degradation products. [32][33][34]…”

Section: Polyaniline Electrode (Pani)mentioning

confidence: 99%

Contribution of polyaniline coating to the stability and performance of nickel hydroxide based electroactive materials

et al. 2020

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This study has been conducted for investigating the contribution of polyaniline (PANI) to the electroactivity of nickel hydroxide (NH) by using a combination of electrochemical, structural and morphological characterization techniques. NH, PANI and nickel hydroxide/PANI composite (NHP) electrodes were produced on nickel foam substrates. Electrodeposition and chemical bath deposition methods were used for the preparation of NH and PANI, respectively. All the electrochemical experiments were conducted in alkaline solutions. NH and PANI were used as reference materials and exhibited properties in accordance with the literature. Namely, for NH electrode capacity decayed by cycling because of the phase transformation from α to β-Ni(OH) 2 , and particles growth from 350 to 850 nm. Also, flower-like structure of the as prepared Ni(OH) 2 faded after 2000 cycles. On the other hand, PANI electrode although exhibited a decrease in the conductivity because of its degradation retained its capacity over cycling because of swelling and shrinking that led to an increased surface area. Composite electrode consisting of PANI and NH resulted in an improvement of capacity retention. At the beginning of cycling capacitance of the composite electrode was 0.64 F/cm 2 , capacity decreased to 0.47 F/cm 2 after 500 cycles then, continuously increased and finally reached to 0.54 F/cm 2 after 2000 cycles. Presence of PANI in combination with NH, limited the particle growth and contributed to the preservation of flower like structure of NH. Contrary to both NH and PANI electrodes, charge transfer resistance of NHP exhibited a decrease with cycling indicating a synergy between NH and PANI in addition to morphological changes.

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“…Furthermore, N-and O-mediated reversible active sites and accessible fast electron and ion transport channels endow the stackable OCN free-standing films electrodes with fast and high energy storage performances beyond weight limitations of conventional electrode fabrication to a commercial level. or radicals groups grafted on polymer backbones or covalent organic frameworks or coupled with conductive carbon nanostructures, e.g., quinone, 28,29 anthraquinone-2-sulfonate, 30 2,6-diaminoanthraquinone, 31 2,5-dimethoxy-1,4-benzoquinone, 32 9, 10-phenanthrenequinone, 33 carbonyl, 34,35 oligoanilines, [36][37][38] pyridine, 39 pyrene, 40 TEMPO, 41 and (tBu 2 MeSi) 3 EC [E = Si, Ge, and Sn]; 42 (3) redox active electrolytes, e.g., TEMPO molecules, 43 viologen, 44 hydroquinone (HQ), 45,46 and TEMPO grafted polymers or ionic liquids; [47][48][49][50] (4) heteroatom-enriched carbons (HECs), e.g., nitrogen, [51][52][53] oxygen, [54][55][56] boron, [57][58][59] sulfur, 60,61 fluorine, 62 and phosphorus 63,64 (doped or co-doped). Although these emerging charged organic molecules as active centers present an excellent approach to increase the pseudocapacitance by a multi-electron faradic process, the capacitance retentions after long charge/ discharge cycles still face a challenge due to the degradation of charged organic molecules leading to irreversi...…”

Section: Progress and Potentialmentioning

confidence: 99%

Commercial-Level Energy Storage via Free-Standing Stacking Electrodes

Liu

Wang

et al. 2019

Matter

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N-and O-mediated anion-selective charging pseudocapacitance originates from inbuilt surface-positive electrostatic potential. The carbon atoms in heptazine adjacent to pyridinic N act as the electron transfer active sites for faradic pseudocapacitance. A free-standing films (FSFs) stacking technique produces current collector-free electrodes with low interfacial resistance for electron and ion transport. The OCN FSFs stacking electrodes enable fast-charging pseudocapacitors delivering high power and high energy with broader potential for real-world impact.

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Degradation-induced capacitance: a new insight into the superior capacitive performance of polyaniline/graphene composites

Abstract: Degradation of PANI induces superior performance of PANI/graphene composite electrodes with the high conductivity matrix of graphene.

Cited by 160 publications

References 55 publications

Writing in a Polyaniline Film with Laser Beam and Stability of the Record: A Raman Spectroscopy Study

Writing in a Polyaniline Film with Laser Beam and Stability of the Record: A Raman Spectroscopy Study

Contribution of polyaniline coating to the stability and performance of nickel hydroxide based electroactive materials

Commercial-Level Energy Storage via Free-Standing Stacking Electrodes

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