Nitrogen-doped carbon nanotubes towards electrochemical sensing: Effect of synthesis temperature

Steinmetz, Marines; Lima, Dhésmon; Machado, Raíssa Ribeiro Lima; Sundararaj, Uttandaraman; Arjmand, Mohammad; Silva, Aline Bruna da; Santos, João Paulo Ferreira; Pessôa, Christiana Andrade; Wohnrath, Karen

doi:10.1016/j.diamond.2020.108093

Cited by 10 publications

(3 citation statements)

References 93 publications

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“…XPS corroborated with Raman data where higher nitrogen content in chlorinated N-doped CNTs (1 : 2) was attributed to the higher I D /I G ratio (1.0), showing a less graphitic structure with more defects and more prone to nitrogen heteroatoms [53].…”

Section: Structural and Morphological Studiessupporting

confidence: 71%

Size-Dependent Chlorinated Nitrogen-Doped Carbon Nanotubes: Their Use as Electrochemical Detectors for Catechol and Resorcinol

Maboya

Rantho

2023

International Journal of Electrochemistry

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In this study, various-sized nitrogen-doped carbon nanotubes (NCNTs) were fabricated by varying the concentration of chlorine in the feed. The diameter of the NCNTs was found to influence the sensing ability of the nanomaterials when coated onto the glassy carbon electrode (GCE) and used for the detection of catechol (CC) and resorcinol (RS). Larger diameter NCNTs (denoted NCNTs (2 : 1)) were produced when a low concentration of chlorine was added into the acetonitrile feed, whereas smaller diameter NCNTs (denoted NCNTs (1 : 2)) were produced when a large concentration of chlorine was added. This investigation revealed that the addition of controllable amounts of chlorine during the fabrication of NCNTs led to the creation of nanostructures with different properties. The greatest current response which was evidenced by an enhanced anodic peak of CC and RS was obtained when GCE was coated with NCNTs (2 : 1), and this was attributed to their large diameter and high graphitic nature which facilitated electron transfer as evidenced by scanning electron microscopy (SEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) analysis. A linear response was obtained when varying the concentration of both CC and RS, with the limits of detection of about 0.059 μM (CC) and 0.034 μM (RS) (3S/M) obtained.

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Section: Structural and Morphological Studiessupporting

confidence: 71%

Size-Dependent Chlorinated Nitrogen-Doped Carbon Nanotubes: Their Use as Electrochemical Detectors for Catechol and Resorcinol

Maboya

Rantho

2023

International Journal of Electrochemistry

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“…Therefore, CoFeOOH cannot be detected from XRD. The addition of NCNT modulates charge distribution across the NCNT and CoFePBA interface, 44 enhances the conductivity, mass diffusion 45 and stability of the catalyst under harsh OER conditions, and prevents the dissolution of the catalyst as well as contributes to improving the corrosion-resistant property.…”

Section: Electrochemical Overall Seawater Splittingmentioning

confidence: 99%

CoFePBA Nanosheets on Carbon Nanotubes Coupled with Nickel-Encapsulated Carbon Tubules for Efficient and Highly Stable Overall Seawater Electrolysis

Ghosh

Fathima

Ganguly

et al. 2023

ACS Appl. Energy Mater.

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The generation of H 2 by seawater electrolysis is limited by anodic chlorine corrosion and sluggish cathodic hydrogen evolution reaction (HER). Here, we report a simple approach for developing cobalt iron (CoFe)-based Prussian blue analogue with a nitrogen-doped carbon nanotube composite (CoFePBA/NCNT) and nickel-encapsulated carbon tubules (Ni/NCT) as oxygen evolution reaction (OER) and HER catalysts for overall seawater electrolysis utilizing graphite felt or carbon paper as the catalyst substrate, thus avoiding chlorine corrosion of the metal substrate. Instead of a commonly known hydrothermal method, a simple brush coating method was employed for catalyst coating which is feasible for large-scale electrolyzer fabrication. Our developed electrolyzer has shown a low overall seawater splitting voltage of 1.71 V and a good stability of 50 h in seawater with excellent selectivity for OER over hypochlorite formation at room temperature (26 °C). High OER activity is attributed to abundant catalytic sites provided by interconnected CoFePBA nanosheets and high intrinsic catalytic activity. Moreover, suppressed hypochlorite formation and corrosion resistance resulting from the synergistic effect of CoFePBA and NCNT make CoFePBA/NCNT||Ni/NCT a potential candidate for seawater electrolyzers. Our work paves a way to demonstrate seawater electrolyzer performance with nonprecious catalysts on a nonmetallic support.

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“…[5][6][7] Among possible dopants (B, N, S, F, and P), the N dopant is perhaps the most frequently studied, since the doping process is typically facile, and the N-doped SWNTs maintain high electrical conductivity and are typically easier to disperse in organic solvents. [8][9][10][11] As potentially negative outcomes, N-doping introduces defects into the SWNT structure, and the insertion of N groups produces changes in the energy band arrangements leading to creation of additional energy levels. Framed within the search for carbon-based metal-free catalysts [12][13][14][15][16][17] for fuel cells 18,19 and metal-air batteries [20][21][22][23] , 24,25 N-doped carbon nanotubes have been reported as metal-free catalysts for the oxygen-reduction reaction (ORR) with much better electrocatalytic activity and operational stability than platinum.…”

Section: Introductionmentioning

confidence: 99%

Mechanical interlocking of SWNTs with N-rich macrocycles for efficient ORR electrocatalysis

et al. 2022

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Nitrogen-doped carbon nanotubes towards electrochemical sensing: Effect of synthesis temperature

Cited by 10 publications

References 93 publications

Size-Dependent Chlorinated Nitrogen-Doped Carbon Nanotubes: Their Use as Electrochemical Detectors for Catechol and Resorcinol

Size-Dependent Chlorinated Nitrogen-Doped Carbon Nanotubes: Their Use as Electrochemical Detectors for Catechol and Resorcinol

CoFePBA Nanosheets on Carbon Nanotubes Coupled with Nickel-Encapsulated Carbon Tubules for Efficient and Highly Stable Overall Seawater Electrolysis

Mechanical interlocking of SWNTs with N-rich macrocycles for efficient ORR electrocatalysis

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