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. 2020 Jan 9;7(5):1902547. doi: 10.1002/advs.201902547

Figure 3.

Figure 3

XPS spectra for NOHCs. a) The survey spectrum of NOHC‐800. b–d) The high‐resolution XPS spectra of C 1s, O 1s, and N 1s for NOHC‐800, respectively. e) The contents of C, N, and O in NOHCs. f) The contents of different species of N in NOHCs.