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This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
SEM images (a) ×2000 and (b) ×100 000 magnifications,
TEM images (c–e), EDAX spectra (j), STEM image (f), and corresponding
elemental mapping images for carbon (g), nitrogen (h), and titanium
(i) of N-TiO2/C.