Functional composition and electrochemical characteristics of oxidized nanosized carbon

Popov, Kirill M.; Fedoseeva, Yu. V.; Kokhanovskaya, O. A.; Razd'yakonova, G.I.; Смирнов, Д. А.; Bulusheva, L. G.; Окотруб, А. В.

doi:10.1134/s0022476617060178

Cited by 7 publications

(4 citation statements)

References 18 publications

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“…It was reported previously that oxygen functional groups enhance the electrochemical capacitance due to an increased number of functional groups on the surface facilitating a higher charge transfer. These results are consistent with the previous studies. − …”

Section: Resultssupporting

confidence: 94%

Single-Step Fabrication Method toward 3D Printing Composite Diamond–Titanium Interfaces for Neural Applications

Mani

Ahnood

Peng

et al. 2021

ACS Appl. Mater. Interfaces

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Owing to several key attributes, diamond is an attractive candidate material for neural interfacing electrodes. The emergence of additivemanufacturing (AM) of diamond-based materials has addressed multiple challenges associated with the fabrication of diamond electrodes using the conventional chemical vapor deposition (CVD) approach. Unlike the CVD approach, AM methods have enabled the deposition of three-dimensional diamond-based material at room temperature. This work demonstrates the feasibility of using laser metal deposition to fabricate diamond−titanium hybrid electrodes for neuronal interfacing. In addition to exhibiting a high electrochemical capacitance of 1.1 mF cm −2 and a low electrochemical impedance of 1 kΩ cm 2 at 1 kHz in physiological saline, these electrodes exhibit a high degree of biocompatibility assessed in vitro using cortical neurons. Furthermore, surface characterization methods show the presence of an oxygenrich mixed-phase diamond−titanium surface along the grain boundaries. Overall, we demonstrated that our unique approach facilitates printing biocompatible titanium−diamond site-specific coating-free conductive hybrid surfaces using AM, which paves the way to printing customized electrodes and interfacing implantable medical devices.

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Section: Resultssupporting

confidence: 94%

Single-Step Fabrication Method toward 3D Printing Composite Diamond–Titanium Interfaces for Neural Applications

Mani

Ahnood

Peng

et al. 2021

ACS Appl. Mater. Interfaces

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“…Figure 4 presents the XPS spectra of carbon, oxygen, and iron in the samples before and after hydrogen plasma treatment. The deconvolution of C 1s spectra ( Figure 4 a) indicates the presence of graphite-like sp 2 carbon (component at 284.5 eV), disordered regions in the hexagonal carbon network (C dis component at 285.1 eV) [ 48 ], carbon in oxygen-containing groups C–O, C=O (286.6 eV), and COOH (288.5 eV), and π plasmon at 290.5 eV [ 49 , 50 , 51 , 52 ]. The plasma-treated sample shows the higher intensity of the peaks from C dis and the oxygen-containing groups, indicative of a larger number of defect states on the CNT surface [ 53 ].…”

Section: Resultsmentioning

confidence: 99%

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

et al. 2020

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Vertically aligned carbon nanotube (CNT) arrays show potential for the development of planar low-voltage emission cathodes. The characteristics of cathodes can be improved by modifying their surface, e.g., by hydrogen plasma treatment, as was performed in this work. The surface of multi-walled CNT arrays grown on silicon substrates from toluene and ferrocene using catalytic chemical vapor deposition was treated in a high-pressure (~104 Pa) microwave reactor. The structure, composition, and current-voltage characteristics of the arrays were studied before and after hydrogen plasma treatment at various power values and durations. CNT tips were destroyed and catalytic iron was released from the CNT channels. The etching rate was influenced by iron particles that formed on the array surface. The lower emission threshold in the plasma-treated arrays than in the initial sample is explained by the amplification factor of the local electric field increasing due to graphene structures of unfolded nanotube layers that formed at the CNT tips.

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“…The more extended plateau capacities of activated samples are supposed to appear due to the presence of micropores developed during the hydrothermal treatments. CV curves measured for the samples at a scan rate of 0.5 mV s −1 are presented in Figure 8a-c. A sharp peak at 0-0.2 V in the cathodic scans is related to the insertion of Na + ions between the carbon layers, while the broad peak at 0.3 V in the reverse anodic scans corresponds to the extraction process [51]. The broad peaks at 0.6-0.8 V in the cathodic scans observed in the CV curves of all samples.…”

Section: Electrochemical Propertiesmentioning

confidence: 82%

“…These reversible Faradaic processes occur with the proton-coupled electron transfer reaction of nitrogen-or oxygen-containing moieties due to the intercalation and absorption of H + into material depth. Only carbonyl oxygen (C=O), pyridinic nitrogen (>N), and pyrrolic nitrogen (>N-H) are electrochemically active in acidic electrolytes [5,9,11,51]. At a scan rate of 5 mV s −1 , the redox peaks from the reversible reduction/oxidation of carbonyl oxygen appear between 0.2 and 0.4 V [12], while the Faradaic process involving the pyridinic nitrogen gave a redox peak in the cathodic scans at a higher potential of~0.7 V [52].…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

Hydrothermal Activation of Porous Nitrogen-Doped Carbon Materials for Electrochemical Capacitors and Sodium-Ion Batteries

et al. 2020

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Highly porous nitrogen-doped carbon nanomaterials have distinct advantages in energy storage and conversion technologies. In the present work, hydrothermal treatments in water or ammonia solution were used for modification of mesoporous nitrogen-doped graphitic carbon, synthesized by deposition of acetonitrile vapors on the pyrolysis products of calcium tartrate. Morphology, composition, and textural characteristics of the original and activated materials were studied by transmission electron microscopy, X-ray photoelectron spectroscopy, near-edge X-ray absorption fine structure spectroscopy, infrared spectroscopy, and nitrogen gas adsorption method. Both treatments resulted in a slight increase in specific surface area and volume of micropores and small mesopores due to the etching of carbon surface. Compared to the solely aqueous medium, activation with ammonia led to stronger destruction of the graphitic shells, the formation of larger micropores (1.4 nm vs 0.6 nm), a higher concentration of carbonyl groups, and the addition of nitrogen-containing groups. The tests of nitrogen-doped carbon materials as electrodes in 1M H2SO4 electrolyte and sodium-ion batteries showed improvement of electrochemical performance after hydrothermal treatments especially when ammonia was used. The activation method developed in this work is hopeful to open up a new route of designing porous nitrogen-doped carbon materials for electrochemical applications.

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Functional composition and electrochemical characteristics of oxidized nanosized carbon

Cited by 7 publications

References 18 publications

Single-Step Fabrication Method toward 3D Printing Composite Diamond–Titanium Interfaces for Neural Applications

Single-Step Fabrication Method toward 3D Printing Composite Diamond–Titanium Interfaces for Neural Applications

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

Hydrothermal Activation of Porous Nitrogen-Doped Carbon Materials for Electrochemical Capacitors and Sodium-Ion Batteries

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