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Chemical methods are more common and can be routinely practiced. Chemical methods can be categorized according to how their components are integrated, namely, via bottom‐up or top‐down approaches. For bottom‐up strategy, single metal atom species (the metal precursors) are directly anchored to the support by a coordination effect between the metal complexes and the anchoring sites on the support surfaces [50]. For top‐down strategy, the metal NPs are directly introduced onto the support surface and then dispersed into SAs to form SACs.