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. 2023 Mar 29;14:420–433. doi: 10.3762/bjnano.14.34

Figure 4.

Figure 4

XPS high-resolution spectra of Ni 2p (a), Fe 2p (b), Co 2p (c), and C 1s (d) levels of the catalysts with the determined surface concentration of the elements (error ≤ 5%).