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. 2020 Mar 31;8:196. doi: 10.3389/fchem.2020.00196

Figure 6.

Figure 6

High-resolution N 1s, S 2p, B 1s, P 2p, Cl 2s, and F 1s XPS spectra of [FA][X]-derived carbons. Numbers in the N 1s spectra indicate the percentage of pyridinic N.