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

Petr M. Korusenko, Sergey N. Nesov, Anna A. Iurchenkova, Ekaterina O. Fedorovskaya, Valery V. Bolotov, Sergey N. Povoroznyuk, Dmitry A. Smirnov, Alexander S. Vinogradov

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

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 nitro-gen-containing multi-walled carbon nanotubes (N-MWCNTs) and their modified derivatives is car-ried 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 pyri-dinic and pyrrolic forms. Moreover, it was established that treatment of N-MWCNTs in HCl is ac-companied 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.

Язык оригиналаанглийский
Номер статьи2163
Число страниц19
ЖурналNanomaterials
Том11
Номер выпуска9
DOI
СостояниеОпубликовано - сен 2021

Предметные области OECD FOS+WOS

  • 2.04 ХИМИЧЕСКИЕ ТЕХНОЛОГИИ
  • 1.03 ФИЗИЧЕСКИЕ НАУКИ И АСТРОНОМИЯ
  • 2.05 ТЕХНОЛОГИЯ МАТЕРИАЛОВ
  • 2.1.NS НАНОНАУКА И НАНОТЕХНОЛОГИИ
  • 2.05.PM МАТЕРИАЛОВЕДЕНИЕ, МУЛЬТИДИСЦИПЛИНАРНОЕ
  • 1.03.UB ФИЗИКА, ПРИКЛАДНАЯ
  • 1.04.DY ХИМИЯ, МУЛЬТИДИСЦИПЛИНАРНАЯ

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