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SEM profiles of (a) Ni catalyst, (b) NiCo-50:50 NiCo catalyst, and (c) Co catalyst and SEM–EDX profiles of (d) Ni elemental mapping in Ni catalyst, (e) Ni and (f) Co elemental mapping of NiCo-50:50 NiCo catalyst, and (g) Co elemental mapping in the Co catalyst. Note that the blue and yellow dots represent Ni and Co elemental mapping, respectively.
