Immiscible bi-metal single-atoms driven synthesis of electrocatalysts having superb mass-activity and durability
[Display omitted] •Immiscible bimetal single atoms synthesized for the first time, with enhanced atomistic active surface area and durability.•High performance hydrogen evolution through fast electron transfer boosted by Cu single atoms embedded in N-doped graphene.•Highly active and durable Ru fcc...
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Veröffentlicht in: | Applied catalysis. B, Environmental Environmental, 2020-08, Vol.270, p.118896, Article 118896 |
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Hauptverfasser: | , , , , , , , , , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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•Immiscible bimetal single atoms synthesized for the first time, with enhanced atomistic active surface area and durability.•High performance hydrogen evolution through fast electron transfer boosted by Cu single atoms embedded in N-doped graphene.•Highly active and durable Ru fcc sites formed near N-bridged Cu single atoms on the surface of Ru nanoparticles.•Ru-Cu immiscibility driven aggregation-blocked catalyst showing outstanding durability for catalytic performance.
Properties of metal elements can be modified by alloying. Given that catalytic efficiencies are often maximized using metal single-atoms (SAs), two immiscible metals can improve the catalytic activity when they can be present as non-agglomerated dual SAs. Here, we report yet-unexplored synthesis of high-performance electrocatalysts utilizing immiscibility of Cu/Ru bimetal atoms. In the synthesized electrocatalyst (Cu/Ru@GN), both Cu-SAs and Ru-SAs are dispersed on N-doped graphitic-matrix (GN), while other Cu-SAs are bridged to Ru nanoparticles (NPs) surface via nitrogen. It shows superior mass-activity with outstanding catalytic performance and durability for hydrogen evolution reaction (HER), outperforming commercial Pt20wt%/C. Cu-SAs along with Ru-NPs enhance electric conduction or charge-transfer rate of GN-templates for fast kinetics. Owing to Cu-Ru immiscibility, the coordination of Cu-SAs by N atoms which bridge to Ru-NPs surface, introduces new active sites and brings about long-term stability (over 600 h in acidic media) by preventing aggregation of Ru-NPs. |
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ISSN: | 0926-3373 1873-3883 |
DOI: | 10.1016/j.apcatb.2020.118896 |