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The atomic step edges on a transition-metal(TM)surface play an important role in surface catalysis due to their distinct reactivities from that of the terrace.The nonuniform growth of graphene on Ni(111)is just such a case.Using first-principles calculations,we show that the step edges of Ni(111)can be passivated in varying degrees by surface alloying with a series of carefully chosen TMs.The alloyed surface can be more uniform bet,between the edges and the terrace,and able to facilitate large-area and high-quality growth of graphene.