Fig. 4.
(a) XPS survey spectra of the GCF, OGCF, and EDA-GCF. (b) High-resolution C 1 s spectra of GCF, OGCF, and EDA-GCF, and (c) N 1 s spectra of EDA-GCF. Solid lines and the shaded area indicate the experimental and fitted data, respectively.
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