Nitric acid oxidation of electrospun carbon nanofibers as supercapacitor electrodes

Ching Chang Lai, Meng Yin Chung, Chieh Tsung Lo

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Nitric acid oxidation of electrospun carbon nanofibers, with varying degrees of oxidation, was carried out to understand the effect of acid treatment on the microstructure and capacitive behavior of the fibers. The increasing treatment time increased considerably the oxygen/carbon (O/C) ratio on the fiber surface, and the increase in the oxygen content was mainly contributed by the formation of carbonyl groups. However, nitric acid oxidation reduced the specific surface area and total pore volume of fibers. The specific capacitance of carbon nanofibers was closely related to the O/C ratio, and the specific capacitance of 365 F/g for carbon nanofibers treated with nitric acid for 5 h was obtained. This was ascribed to the increased fiber polarity that facilitated the diffusion of electrolyte ions into the nanofibers. Furthermore, the functional groups contributed to the pseudocapacitance, which was caused by faradaic reactions of oxygen-containing functional groups. The effect of these groups dominated that of structural change on the electrochemical performance of fibers.

Original languageEnglish
Pages (from-to)2337-2348
Number of pages12
JournalTextile Research Journal
Volume87
Issue number19
DOIs
Publication statusPublished - 2017 Nov 1

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Polymers and Plastics

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