Figure 1: Schematic illustration of the synthetic route and model of the RuCo nanoalloys encapsulated in nitrogen-doped graphene layers.

(a) a nanocube of Co3[Co(CN)6]2 precursor, (b) a nanocube of Ru-doped Co3[Co(CN)6]2, (c) an aggregate of RuCo alloys encapsulated in graphene layers and (d) enlarged model of RuCo nanoalloy encapsulated in nitrogen-doped graphene layers as an electrocatalyst towards hydrogen evolution reaction in alkaline media.