Boron/nitrogen co-doped helically unzipped multiwalled carbon nanotubes as efficient electrocatalyst for oxygen reduction

Alireza Zehtab Yazdi, Huilong Fei, Ruquan Ye, Gunuk Wang, James Tour, Uttandaraman Sundararaj

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

Bamboo structured nitrogen doped multiwalled carbon nanotubes have been helically unzipped, and nitrogen doped graphene oxide nanoribbons (CNx-GONRs) with a multifaceted microstructure have been obtained. CNx-GONRs have then been codoped with nitrogen and boron by simultaneous thermal annealing in ammonia and boron oxide atmospheres, respectively. The effects of the codoping time and temperature on the concentration of the dopants and their functional groups have been extensively investigated. X-ray photoelectron spectroscopy results indicate that pyridinic and BC3 are the main nitrogen and boron functional groups, respectively, in the codoped samples. The oxygen reduction reaction (ORR) properties of the samples have been measured in an alkaline electrolyte and compared with the state-of-the-art Pt/C (20%) electrocatalyst. The results show that the nitrogen/boron codoped graphene nanoribbons with helically unzipped structures (CNx/CBx-GNRs) can compete with the Pt/C (20%) electrocatalyst in all of the key ORR properties: onset potential, exchange current density, four electron pathway selectivity, kinetic current density, and stability. The development of such graphene nanoribbon-based electrocatalyst could be a harbinger of precious metal-free carbon-based nanomaterials for ORR applications.

Original languageEnglish
Pages (from-to)7786-7794
Number of pages9
JournalACS Applied Materials and Interfaces
Volume7
Issue number14
DOIs
Publication statusPublished - 2015 Apr 15
Externally publishedYes

Keywords

  • bamboo structures
  • codoping
  • graphene nanoribbons
  • helical unzipping
  • oxygen reduction

ASJC Scopus subject areas

  • Materials Science(all)

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