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Synergic Reaction Kinetics over Adjacent Ruthenium Sites for Superb Hydrogen Generation in Alkaline Media. | LitMetric

AI Article Synopsis

  • Ruthenium (Ru) is a promising alternative to platinum (Pt) for hydrogen evolution reactions (HER), but efficiency in alkaline solutions remains challenging.
  • Researchers developed a unique carbon substrate with well-dispersed Ru nanoparticles and single atoms (Ru -NC) that demonstrated impressive performance, achieving an ultralow overpotential of 14.8 mV and a high turnover frequency of 1.25 H s.
  • The study reveals that the interaction between Ru nanoparticles and single atoms enhances electron delivery, improving the reaction kinetics and overall hydrogen generation efficiency in alkaline media, offering new insights for catalyst design.

Article Abstract

Ruthenium (Ru)-based electrocatalysts as platinum (Pt) alternatives in catalyzing hydrogen evolution reaction (HER) are promising. However, achieving efficient reaction processes on Ru catalysts is still a challenge, especially in alkaline media. Here, the well-dispersed Ru nanoparticles with adjacent Ru single atoms on carbon substrate (Ru -NC) is demonstrated to be a superb electrocatalyst for alkaline HER. The obtained Ru -NC exhibits ultralow overpotential (14.8 mV) and high turnover frequency (1.25 H  s at -0.025 V vs reversible hydrogen electrode), much better than the commercial 40 wt.% Pt/C. The analyses reveal that Ru nanoparticles and single sites can promote each other to deliver electrons to the carbon substrate. Eventually, the electronic regulations bring accelerated water dissociation and reduced energy barriers of hydroxide/hydrogen desorption on adjacent Ru sites, then an optimized reaction kinetics for Ru -NC is obtained to achieve superb hydrogen generation in alkaline media. This work provides a new insight into the catalyst design in simultaneous optimizations of the elementary steps to obtain ideal HER performance in alkaline media.

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Source
http://dx.doi.org/10.1002/adma.202110604DOI Listing

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