Electrochemical behavior of polyaniline: A study by electrochemical impedance spectroscopy (EIS) in low-frequency

Martins, João Carlos; Neto, José C. de M.; Passos, Raimundo R.; Pocrifka, Leandro A.

doi:10.1016/j.ssi.2019.115198

Cited by 29 publications

(14 citation statements)

References 36 publications

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“…Figure a shows the typical reversible cyclic voltammetry (CV) curves of the double-layer capacitor. It was not difficult to find that in the applied voltage range of −0.5 to 0.5 V, EGaIn/Pt-IPMC exhibits quasi-ideal electric double-layer capacitance behavior at scanning speeds of 20–100 mV s –1 . , Moreover, at the scanning speed of 100mV s -1 , the CV Curve of three types of IPMC shows that EGaIn-IPMC has the largest rectangular area (Figure b). Especially when the scanning speed was 20 mV s –1 , the extremely large specific surface area of the EGaIn/Pt-IPMC electrode makes it exhibit a large weight-to-weight capacitance of 450 F g –1 (Figure c).…”

Section: Resultsmentioning

confidence: 98%

An Antifatigue Liquid Metal Composite Electrode Ionic Polymer-Metal Composite Artificial Muscle with Excellent Electromechanical Properties

Jiao

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Ionic polymer–metal composites (IPMC), one of the most popular materials in the field of artificial muscle research, have attracted much attention because of their high flexibility, low drive voltage (<10 V), high force density, large deformation, and so forth. However, the results show that the serious electrode fatigue crack and water loss of traditional IPMC greatly decrease its fatigue life and limit the practical application. In this study, we developed a novel liquid metal composite electrode. A layer of eutectic gallium–indium alloy (EGaIn) liquid metal was applied to the surface of the platinum electrode of the IPMC using a mask. Because of the good self-healing performance of the liquid metal, it is expected to solve the above problems of resistance increase and water loss caused by cracks. It turns out that the prepared EGaIn/Pt-IPMC exhibits a driving force up to 120 mN and maximum fatigue life of about 25,000 s at a driving voltage of 3 V. Compared with the best work reported, the fatigue strength of EGaIn/Pt-IPMC was increased by about 210%, and the maximum driving force of EGaIn/Pt-IPMC prepared by a single-layer basement membrane was between the IPMC prepared by 4–6 layer basement membrane. The electromechanical properties were significantly improved, and it is expected to realize a series of bionic applications.

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Section: Resultsmentioning

confidence: 98%

An Antifatigue Liquid Metal Composite Electrode Ionic Polymer-Metal Composite Artificial Muscle with Excellent Electromechanical Properties

Jiao

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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“…These results indicate favorable charge transfer and lower ion diffusion resistance at the PANI@BP/electrolyte interface with ideal capacitive behavior. [49] Moreover, a fitting of the RC circuit model yielded a resistor-capacitor time constant (τ RC ) of 30.4 ms, it could be replaced typical capacitors for AC line-filtering. Also, small τ RC exhibits the highly efficient reduction of charging discharging time for quick AC-line filtering ability.…”

Section: Resultsmentioning

confidence: 99%

Real‐Time Biomonitoring Device Based on 2D Black Phosphorus and Polyaniline Nanocomposite Flexible Supercapacitors

Vaghasiya

Křípalová

Hermanová

et al. 2021

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The emergence of flexible and portable real-time healthcare electronics has stimulated the fast production of compact, lightweight, and high electrochemical performance flexible energy storage systems. [1][2][3][4] Flexible supercapacitors (FSCs) are favored among various energy storage devices because they offer much greater capacitance, excellent cycling stability, rapid charge/discharge rate, and high-power density. [5][6][7][8] Typically, 2D materials, such transitional metal dichalcogenides (TMDs) and metal carbides (MXenes) are promising nanomaterials that enhance the performance of FSCs due to their metallicity. However, semiconductor 2D materials like black phosphorus show low capacitive behaviors but can provide large surface area to prepare hybrid nanocomposites in combination with conductive polymers.Polyaniline (PANI) is extensively utilized in the development of FSCs due to its outstanding electrochemical activity and inherent flexibility as mentioned earlier. [9][10][11] Nevertheless, the majority of reported FSCs based on PANI electrodes exhibit thick and distorted structures. This not only prevents electrolyte ion migration and absorption, but also causes structural distortion of PANI upon charge-discharge cycles, leading to lower capacitance and longevity of the cycle. [12][13][14] In order to resolve the above obstacles, 2D nanomaterials (e.g., black phosphorous (BP), MXene) are combined with PANI during polymerization to improve the surface area, establish internal space, and improve structural stability upon ambient condition. [15] Correspondingly, different materials, such as carbon nanotubes (CNT) and reduced graphene oxides (rGO), have been chosen to strengthen PANI-based electrodes and impede the creation of a thick and distorted structure. [10,16] Recent studies focused on electronic proprieties of layered BP and potential applications in optoelectronics [17][18][19] as well as electrochemical energy storage devices. [20][21][22] The wider spacing between nearby puckered layers facilitates easy intercalation and rapid ion diffusion, thus improving the overall performance of energy storage devices. [23,24] To obtain high electrochemical performance, various kinds of conductive materials have been hybridized with BP electrodes, [25] including CNT@BP, [26,27] polypyrrole@BP, [28,29] Ti 3 C 2 T x @BP quantum dot, [30] rGO@BP, [31][32][33] poly(3,4-ethylenedioxythiophene)@BP, [34] PANI@BP, [35,36] and Flexible energy storage devices are becoming significantly important to power wearable and portable devices that monitor physiological parameters for many biomedical applications. Many hybrid nanomaterials based on 2D materials are used in order to improve the performance of flexible energy storage devices. Here, a hybrid nanocomposite is synthesized through in situ polymerization of aniline in the presence of black phosphorus (BP) nanoflakes. This nanocomposite, polyaniline (PANI)@BP, is employed to fabricate flexible supercapacitor (FSC) electrodes. PANI@BP FSCs can provide a power source for b...

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“…At the low‐frequency region, the 45° sloped portion of the Nyquist plot indicates the Warburg impedance, which is a result of electrolyte diffusion resistance. More Warburg impedance indicates the cell‘s electrochemical behavior at this stage is a diffusion‐controlled process rather than a capacitive process [55] . The values of Warburg impedance for the PANI and PANI‐FA01 are 0.86 and 0.49 Ω, respectively, indicating the more diffusion and interaction of electrolyte ions into the electrode material leading to capacitive behavior.…”

Section: Electrochemical Performancementioning

confidence: 99%

Enhancing the Electrochemical Performance of Polyaniline Using Fly Ash of Coal Waste for Supercapacitor Application

et al. 2021

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Hybrid materials are essential materials for the future age elite electrochemical supercapacitors. A hybrid material or organic polymer‐inorganic metal oxide composite comprises of polyaniline (PANI) with fly ash (FA) is made by in‐situ polymerization of aniline monomer with fly ash, an inexhaustible asset. The impact of fly ash on polyaniline is resolved from electrical and electrochemical measurements. PANI‐FA is utilized in a supercapacitor cell as the electrode. FT‐IR, XRD, FE‐SEM, TGA and BET evaluate properties of this hybrid, and their electrochemical properties are assessed by CV, CD, and EIS measurements. PANI with 10 wt.% of FA (PANI‐FA01) indicates higher conductivity and supercapacitor execution than its individual material via metal oxide, acting as an intermediate for transferring ions from PANI and electrolyte. PANI‐FA01 demonstrates a higher capacitance estimation of 208 F g−1 contrasted with PANI (83 F g−1) at 2.5 A g−1. The hybrid electrode material shows better charge‐discharge cycles, holding over 66 % of its first cycle gravimetric capacitance after 5000 cycles with effective coulombic efficiency of 99–100 %, which is as yet 43 % higher than the specific capacity of PANI. The Bode plot shows a phase angle of 80°.

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Electrochemical behavior of polyaniline: A study by electrochemical impedance spectroscopy (EIS) in low-frequency

Cited by 29 publications

References 36 publications

An Antifatigue Liquid Metal Composite Electrode Ionic Polymer-Metal Composite Artificial Muscle with Excellent Electromechanical Properties

An Antifatigue Liquid Metal Composite Electrode Ionic Polymer-Metal Composite Artificial Muscle with Excellent Electromechanical Properties

Real‐Time Biomonitoring Device Based on 2D Black Phosphorus and Polyaniline Nanocomposite Flexible Supercapacitors

Enhancing the Electrochemical Performance of Polyaniline Using Fly Ash of Coal Waste for Supercapacitor Application

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