fig7
Figure 7. (A) Schematic illustration of the developed ball-milling approach. Adapted with permission[30]. Copyright 2021, Wiley-VCH GmbH; (B) Schematic diagram of Ni/CN-X synthesized via high-energy ball milling method. Enlarge diagram: a combination of impact, shear, and friction forces generated in a planetary-type ball mill. Adapted with permission[31]. Copyright 2023, Elsevier B.V.
