Nanoscale mapping of catalytic hotspots on Fe, N-modified HOPG by scanning electrochemical microscopy-atomic force microscopy

Srikanth Kolagatla, Palaniappan Subramanian, Alex Schechter

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The scanning electrochemical microscopy-atomic force microscopy (SECM-AFM) technique is used to map catalytic currents post Fe and N surface modification of graphitic carbon with an ultra-high resolution of 50 nm. The oxidation current of the partial reduction product, hydrogen peroxide, was also mapped in the same location in the graphitic carbon. The current mapping and ex situ spectroscopic evidence revealed that Fe-coordinated nitrogen sites formed both in the edge and basal planes of highly ordered pyrolytic graphite (HOPG) constitute the primary oxygen reduction catalytic sites in acid solutions of this important yet insufficiently understood class of catalysts.

Original languageEnglish
Pages (from-to)6962-6970
Number of pages9
JournalNanoscale
Volume10
Issue number15
DOIs
StatePublished - 21 Apr 2018

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