Figure 11

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(A) N 1s and Ni 2p XPS fine spectra of Ni-N2O2/C. Reproduced with permission from ref. [72]. Copyright©2020, John Wiley and Sons. (B) N 1s and Co 2p XPS fine spectra of Co-SACs/N-C and control samples. Reproduced with permission from ref. [109]. Copyright©2020, Springer Nature.

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