Figure 2.
(a) Raman spectra and (b) High-resolution X-ray photoelectron spectroscopy (XPS) spectra of PPC, N-PPC, Fe-PPC, and Fe-N-PPC; (c) N 1s spectra of PPC, N-PPC and Fe-N-PPC; (d) Fe 2p spectra of Fe-N-PPC.
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