MWCNT buckypaper/polypyrrole nanocomposites for supercapasitor application

Iurchenkova, Anna A.; Fedorovskaya, Ekaterina O.; Asanov, I. P.; Архипов, В. Е.; Popov, Kirill M.; Baskakova, Kseniya I.; Окотруб, А. В.

doi:10.1016/j.electacta.2020.135700

Cited by 38 publications

(17 citation statements)

References 62 publications

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“…The dependencies of the current value for peaks A-C on the scan rate (Figure 4d) demonstrate a linear behavior in all ranges of scan rates, which is typical for pseudo-capacitive reactions. In turn, the peak current values depend linearly on the square root of the scan rate (Figure 4e) only in the scan rate range from 5 to 40 mV•s −1 , meaning that the processes are diffusion-controlled in this scan rate range in accordance with the Randles-Sevcik Equation ( 7) [59,60]:…”

Section: Resultsmentioning

confidence: 78%

“…The dependencies of the current value for peaks A–C on the scan rate ( Figure 4 d) demonstrate a linear behavior in all ranges of scan rates, which is typical for pseudo-capacitive reactions. In turn, the peak current values depend linearly on the square root of the scan rate ( Figure 4 e) only in the scan rate range from 5 to 40 mV·s −1 , meaning that the processes are diffusion-controlled in this scan rate range in accordance with the Randles–Sevcik Equation (7) [ 59 , 60 ]:

where v is the linear potential scan rate, V·s −1 ; n is the number of electrons involved in the electrochemical process; F is the Faraday constant, 96.485 C·mol −1 ; R is the universal gas constant, 8.314 J·mol −1 K −1 ; T is the temperature, K; D av is the averaged chemical diffusion coefficient, cm −2 ·s −1 ; c 0 is the cation initial (maximum) bulk concentration (for the anodic potential scanning) or anion concentration (for the cathodic potential scanning), mol·cm −3 ; z is the correction factor.…”

Section: Resultsmentioning

confidence: 96%

“…These peaks correspond to the reversible protonation/deprotonation reaction of pyridinic nitrogen (Equation (5)) [ 57 , 58 ]. The second pair, the peak B 1 at 545 mV on the charge curve and the peak B 2 at 506 mV on the discharge curve are attributed to the reversible protonation/deprotonation of pyrrolic nitrogen (see Equation (4)) [ 59 ]. Finally, the third pair of peaks, C 1 and C 2 , which are located at 599 mV and 495 mV on the charge and discharge curves, respectively, are associated with redox reactions involving OCFG.…”

Section: Resultsmentioning

confidence: 99%

“…The CPE 1 and R ct 1 elements are DEL capacitance and resistance, respectively [ 64 ]. The parallel combination of CPE 2 with R ct 2 and W (Nernst diffusion) describe the second semicircle and is typical of the Faradaic impedance [ 59 , 65 ]. It should be noted that for the electrodes based on N-MWCNT treated with hydrochloric acid and irradiated with an ion beam, an increase in the second circle in comparison with the electrode based on the as-prepared N-MWCNTs is observed.…”

Section: Resultsmentioning

confidence: 99%

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Comparative Study of the Structural Features and Electrochemical Properties of Nitrogen-Containing Multi-Walled Carbon Nanotubes after Ion-Beam Irradiation and Hydrochloric Acid Treatment

et al. 2021

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Using a set of microscopic, spectroscopic, and electrochemical methods, a detailed study of the interrelation between the structural and electrochemical properties of the as-prepared nitrogen-containing multi-walled carbon nanotubes (N-MWCNTs) and their modified derivatives is carried out. It was found that after treatment of nanotubes with hydrochloric acid, their structure is improved by removing amorphous carbon from the outer layers of N-MWCNTs. On the contrary, ion bombardment leads to the formation of vacancy-type structural defects both on the surface and in the bulk of N-MWCNTs. It is shown that the treated nanotubes have an increased specific capacitance (up to 27 F·g−1) compared to the as-prepared nanotubes (13 F·g−1). This is due to an increase in the redox capacitance. It is associated with the reversible Faraday reactions with the participation of electrochemically active pyridinic and pyrrolic nitrogen inclusions and oxygen-containing functional groups (OCFG). Based on the comparison between cyclic voltammograms of N-MWCNTs treated in HCl and with an ion beam, the peaks on these curves were separated and assigned to specific nitrogen inclusions and OCFGs. It is shown that the rate of redox reactions with the participation of OCFGs is significantly higher than that of reactions with nitrogen inclusions in the pyridinic and pyrrolic forms. Moreover, it was established that treatment of N-MWCNTs in HCl is accompanied by a significant increase in the activity of nitrogen centers, which, in turn, leads to an increase in the rate of redox reactions involving OCFGs. Due to the significant contribution of redox capacitance, the obtained results can be used to develop supercapacitors with increased total specific capacitance.

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Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Comparative Study of the Structural Features and Electrochemical Properties of Nitrogen-Containing Multi-Walled Carbon Nanotubes after Ion-Beam Irradiation and Hydrochloric Acid Treatment

et al. 2021

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“…In another strategy, nanocomposites of PPy and carbon nanomaterials, such as activated carbon, [21–23] graphene oxide, [24–28] reduced graphene oxide, [29–31] and multi‐walled [32–36] and single‐walled [37–40] carbon nanotubes, have been fabricated, and an improved performance of these composites in comparison to pristine PPy has been reported. Among these carbon nanomaterials, multi‐walled carbon nanotubes (MWCNTs) are particularly useful in the preparation of composites with polypyrrole.…”

Section: Introductionmentioning

confidence: 99%

Oxidized MWCNTs as an Oxidizing Agent and Dopant in MWCNT@Polypyrrole Composite Formation**

et al. 2021

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A new approach to the formation of composites of carbon nanotubes and polypyrrole (PPy) is proposed. Oxidized multi‐walled carbon nanotubes (ox‐MWCNTs) are used as oxidation agents in pyrrole polymerization. The polymeric phase is deposited both at the surface of the carbon nanotube to form a core‐shell structure and in the empty spaces of the MWCNT network. Each form of the polypyrrole phase exhibits different electrochemical properties. PPy deposited directly at the carbon nanotube surface as a uniform and dense layer is oxidized at less positive potentials, compared to the polymeric material deposited in the pores of the nanotube network. MWCNTs with anions incorporated into structural defects formed during their oxidation in a piranha solution also act as dopants of the oxidized form of PPy. The polymeric film deposited directly at the ox‐MWCNT surface is in its oxidized state. The redox processes involving this part of the PPy film are accompanied by the transport of cations of the supporting electrolyte. The charge transfer between ox‐MWCNTs and the deposited PPy film is confirmed by the results of the theoretical calculations of the energy states at the carbon nanotube and polypyrrole interface. A neutral PPy film located in layers remote from the surface of the nanotube is oxidized at more positive potentials. The oxidation of PPy located in the pores of the ox‐MWCNT network results in a broad voltammetric peak formation.

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The effect of the pyrolysis temperature and biomass type on the biocarbons characteristics

Iurchenkova,

Kobets,

Ahaliabadeh

et al. 2024

ChemSusChem

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The conversion of biomass and natural wastes into carbon‐based materials for various applications such as catalysts and energy‐related materials is a fascinating and sustainable approach emerged during recent years. Precursor nature and characteristics are complex, hence, their effect on the properties of resulting materials is still unclear. In this work, we have investigated the effect of different precursors and pyrolysis temperature on the properties of produced carbon materials and their potential application as negative electrode materials in Li‐ion batteries. Three biomasses, lignocellulosic brewery spent grain from a local brewery, catechol‐rich lignin and tannins, were selected for investigations. We show that such end‐product carbon characteristic as functional and elemental composition, porosity, specific surface area, defectiveness level, and morphology strictly depend on the precursor composition, chemical structure, and pyrolysis temperature. The electrochemical characteristics of produced carbon materials are correlate with the characteristics of the produced materials. A higher pyrolysis temperature is shown to be favourable for production of carbon material for the Li‐ion battery application in terms of both specific surface area and long‐term cycling stability.

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MWCNT buckypaper/polypyrrole nanocomposites for supercapasitor application

Cited by 38 publications

References 62 publications

Comparative Study of the Structural Features and Electrochemical Properties of Nitrogen-Containing Multi-Walled Carbon Nanotubes after Ion-Beam Irradiation and Hydrochloric Acid Treatment

Comparative Study of the Structural Features and Electrochemical Properties of Nitrogen-Containing Multi-Walled Carbon Nanotubes after Ion-Beam Irradiation and Hydrochloric Acid Treatment

Oxidized MWCNTs as an Oxidizing Agent and Dopant in MWCNT@Polypyrrole Composite Formation**

The effect of the pyrolysis temperature and biomass type on the biocarbons characteristics

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