Synergistic effect between Co single atoms and Pt nanoparticles for efficient alkaline hydrogen evolution

Abstract

In the pursuit of sustainable energy solutions, the efficiency of the hydrogen evolution reaction (HER) in alkaline conditions has been a significant challenge, primarily due to the sluggish dissociation of water molecules on platinum (Pt) catalysts. Addressing this critical issue, our study introduces an innovative Pt-Co@NCS catalyst. This catalyst synergistically combines Pt nanoparticles with Co single atoms on a nitrogen-doped carbon scaffold, overcoming the traditional bottleneck of slow water dissociation. Its unique porous concave structure and nitrogen-enriched surface not only provide abundant anchoring sites for Co atoms but also create a conducive hydrophilic environment around the Pt particles. This design leads to a drastic improvement in the water dissociation process, as demonstrated by CO stripping and deuterium labeling experiments. Achieving an outstanding current density of 162.8 mA cm ^−2 at −0.1 V versus RHE, a Tafel slope of 26.2 mV dec ^−1 , and a superior nominal mass activity of 15.75 mA μ g _Pt ^−1 , the Pt-Co@NCS catalyst represents a significant step forward in enhancing alkaline HER efficiency, indicating promising advancements in the field.

Keywords

• synergistic catalysis
• single atom catalysts
• alkaline water splitting
• flow electrolyser
• hydrogen evolution