Ultrasonic exfoliation of carbon fiber: electroanalytical perspectives

Casimero, Charnete; Hegarty, Catherine; McGlynn, Ruairi; Davis, James A.

doi:10.1007/s10800-019-01379-y

Cited by 21 publications

(19 citation statements)

References 58 publications

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“…The ultrasound treatments’ ability to increase oxygenated functional groups, improving the charge-transfer capacity on nanofibers, has been reported . This observation further confirms the positive role of the LPE proposed here, since often chemical and physical activator treatments are needed to obtain carbon nanofibers with useful electrochemistry.…”

Section: Resultssupporting

confidence: 85%

Water-Phase Exfoliated Biochar Nanofibers from Eucalyptus Scraps for Electrode Modification and Conductive Film Fabrication

Bukhari

Silveri

Pelle

et al. 2021

ACS Sustainable Chem. Eng.

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A solvent-free strategy to produce water-dispersed biochar-nanofibers (BH-CNF) is reported, demonstrating the potential of this cost-effective and sustainable material in electrochemical sensing and fabrication of conductive films. Water-phase BH-CNF from eucalyptus scraps were achieved using a Kraft process followed by liquid-phase exfoliation assisted by the biological stabilizing agent sodium cholate. BH-CNF-based sensors were constructed following two strategies: surface modification of screen-printed electrodes and fabrication of exclusively nanofiber-based flexible sensors. The latter were fabricated through a procedure that is cost-effective and within everyone’s reach. The potentiality of the BH-CNF-based sensors has been challenged toward a wide range of analytes containing phenol moieties and applied for detection of o-diphenols and m-phenols in olive oil samples. The BH-CNF-based sensors exhibited repeatable (RSD ≤ 7%, n = 5) and reproducible (RSD ≤ 10%; n = 3) results, proving their applicability in electroanalytical applications and the robustness of the exfoliation and fabrication strategy. For sample analysis, LODs for hydroxytyrosol (LOD ≤ 0.6 μM) and tyrosol (LOD ≤ 3.8 μM), intersensor precision (RSD calibration slope < 7%, n = 3), and recoveries obtained in real sample analysis (91–111%, RSD ≤ 6%; n = 3) endorse the material exploitability in real analytical applications.

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Section: Resultssupporting

confidence: 85%

Water-Phase Exfoliated Biochar Nanofibers from Eucalyptus Scraps for Electrode Modification and Conductive Film Fabrication

Bukhari

Silveri

Pelle

et al. 2021

ACS Sustainable Chem. Eng.

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“…As suggested by some authors, the surface shown in Fig. 4a is proposed, which is in agreement with the H2SO4 treatment performed in this study [34,35,37,40,41,42,43].…”

Section: Characterization Of the Carbon Cloth Electrodesupporting

confidence: 92%

“…3a, revealing the appearance of peak Ia in the anodic direction (oxidation). The appearance of this signal can be attributed to the oxidation of electrochemically active functional groups on the surface because of treatment with H2SO4 [34], such as quinones, aldehydes, or carboxylic acids [35,36,37]. Reversing the scanning in a cathode sense (reduction) reveals peak Ic, assigned to the reduction of electrochemically active functional groups on the surface.…”

Section: Characterization Of the Carbon Cloth Electrodementioning

confidence: 99%

Traditional beverage pulque yeast isolates for potential application in microbial electrochemical technologies using corn cooking industry effluents as substrate

Reyes-Vidal,

Pérez-García,

García-Sánchez

et al. 2023

Preprint

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Purpose In this work, exoelectrogenic potential of the yeasts isolated from traditional beverage in Mexico (pulque) in an MFC when corn cooking industry effluent (CCIE) is used as substrate. Methods The yeasts were isolated in YPD and a screening was carried out with a sugar assimilation test, selecting the CR4 isolate for the bioelectrochemical tests. For these studies, CR4 was inoculated into a double-chamber MFC containing a carbon cloth anode treated with H2SO4. YPD, CCIE and CCIE + NaCl were used as electrolyte. The i0, Rct and Rmt were calculated by fitting polarization curves using the Butler-Volmer kinetic model. Results Electrochemical studies revealed the ability of CR4 to transfer electrons to a chemically treated anode. The control MFCs obtained the highest electronic transfer rate by having i0 values close to 1.01 x 10 − 4 A and low Rct values compared to the other treatments (255.28 Ω). When using the CCIE treatment, the resistance increased (664.55 Ω) due to the complexity of assimilation of the substrate, giving rise to low values of biomass in the electrode (0.11 mg/mL). The CCIE + NaCl treatment improved the output voltage, however, resistance increased, probably due to the low availability of the substrate since the resistance to mass transfer (Rmt) reached values of up to 1007.55 Ω. Conclusions These results will help to understand the behavior of yeasts in bioelectrochemical systems, improving the future development of microbial electrochemical technologies applied to effluent treatment.

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“…Band G is a characteristic peak of sp 2 carbon in the graphitic structure. Band 2D, located at 2690 cm −1 , is a combination of bands D and G and is also a characteristic band of the graphitic carbon 47 , 48 . As can be seen, the spectrum of the original CF is relatively weak, but it sharply increases after modification, indicating that the structure of the carbon fiber has changed.…”

Section: Resultsmentioning

confidence: 99%

Compressed composite carbon felt as a negative electrode for a zinc–iron flow battery

Saupsor

Sangsawang

Kao-ian

et al. 2022

Sci Rep

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Flow batteries possess several attractive features including long cycle life, flexible design, ease of scaling up, and high safety. They are considered an excellent choice for large-scale energy storage. Carbon felt (CF) electrodes are commonly used as porous electrodes in flow batteries. In vanadium flow batteries, both active materials and discharge products are in a liquid phase, thus leaving no trace on the electrode surface. However, zinc-based flow batteries involve zinc deposition/dissolution, structure and configuration of the electrode significantly determine stability and performance of the battery. Herein, fabrication of a compressed composite using CF with polyvinylidene fluoride (PVDF) is investigated in a Zn–Fe flow battery (ZFB). Graphene (G) is successfully introduced in order to improve its electrochemical activity towards zinc reactions on the negative side of the ZFB. A compressed composite CF electrode offers more uniform electric field and lower nucleation overpotential (NOP) of zinc than a pristine CF, resulting in higher zinc plating/stripping efficiency. Batteries with modified electrodes are seen to provide lower overpotential. Particularly, the G-PVDF-CF electrode demonstrates maximum discharge capacity of 39.6 mAh cm−2 with coulombic efficiency and energy efficiency over 96% and 61%, respectively. Finally, results lead to increased efficiency and cycling stability for flow batteries.

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Ultrasonic exfoliation of carbon fiber: electroanalytical perspectives

Cited by 21 publications

References 58 publications

Water-Phase Exfoliated Biochar Nanofibers from Eucalyptus Scraps for Electrode Modification and Conductive Film Fabrication

Water-Phase Exfoliated Biochar Nanofibers from Eucalyptus Scraps for Electrode Modification and Conductive Film Fabrication

Traditional beverage pulque yeast isolates for potential application in microbial electrochemical technologies using corn cooking industry effluents as substrate

Compressed composite carbon felt as a negative electrode for a zinc–iron flow battery

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