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Title: Correcting flaws in the assignment of nitrogen chemical environments in N-doped graphene
Author: Figueras Valls, Marc
Villar-Garcia, Ignacio J.
Viñes Solana, Francesc
Sousa Romero, Carmen
de la Peña O'Shea, Victor A.
Illas i Riera, Francesc
Keywords: Electrocatàlisi
Espectroscòpia de raigs X
X-ray spectroscopy
Issue Date: 11-Apr-2019
Publisher: American Chemical Society
Abstract: X-ray Photoelectron Spectroscopy (XPS) applied to N-doped graphene leads to a rather broad N(1s) core level signal that, based on different sources available in the literature, is most often interpreted by fitting the experimental spectra to three peaks. The resulting N(1s) features are assigned to graphitic, pyrrolic, and pyridinic nitrogen, even if these are far from being uniquely defined in the literature. This broadly accepted interpretation has been questioned by recent accurate Hartree-Fock calculations concluding that graphitic and pyrrolic N(1s) core level binding energies are too close to be distinguished. Consideration of models with N in other so far unexplored environments such as N dimers or N at defects show some variations in the calculated core level binding energies. However, these are not large enough to justify a third peak and suggest that the usual three peaks interpretation of the N(1s) XPS in N-doped graphene may be an artefact caused by the fitting procedure. New measurements have been carried out for samples of N-doped graphene and the obtained N(1s) spectra fitted to two or three peaks. It turns out that the spectra can be equally fitted using two or three peaks but only the former is consistent with the results of the unbiased ab initio calculations which calls for a revision of the usual assignment.
Note: Versió postprint del document publicat a:
It is part of: Journal of Physical Chemistry C, 2019, vol. 123, num. 17, p. 11319-11327
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ISSN: 1932-7447
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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