fig1
Figure 1. Potential active centers of each type of catalyst. (A) MN4-gra (M = Fe, Co, Ni); (B) MMN6-gra; (C) M1M2N6-gra.
Figure 1. Potential active centers of each type of catalyst. (A) MN4-gra (M = Fe, Co, Ni); (B) MMN6-gra; (C) M1M2N6-gra.
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