Direct imaging of heteroatom dopants in catalytic carbon nano-onions

Melonie P. Thomas, Namal Wanninayake, Manisha De Alwis Goonatilleke, Doo Young Kim, Beth S. Guiton

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The hollow core, concentric graphitic shells, and large surface area of the carbon nano-onion (CNO) make these carbon nanostructures promising materials for highly efficient catalytic reactions. Doping CNOs with heteroatoms is an effective method of changing their physical and chemical properties. In these cases, the configurations and locations of the incorporated dopant atoms must be a key factor dictating catalytic activity, yet determining a structural arrangement on the single-atom length scale is challenging. Here we present direct imaging of individual nitrogen and sulfur dopant atoms in CNOs, using an aberration-corrected scanning transmission electron microscopy (STEM) approach, combined with electron energy loss spectroscopy (EELS). Inspection of the statistics of dopant configuration and location in sulfur-, nitrogen-, and co-doped samples reveals dopant atoms to be more closely situated to defects in the graphitic shells for co-doped samples, than in their singly doped counterparts. Correlated with an increased activity for the oxygen reduction reaction in the co-doped samples, this suggests a concerted mechanism involving both the dopant and defect.

Original languageEnglish
Pages (from-to)6144-6152
Number of pages9
JournalNanoscale
Volume12
Issue number10
DOIs
StatePublished - Mar 14 2020

Bibliographical note

Publisher Copyright:
© 2020 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Materials Science

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