Platinum(Pt)is the state-of-the-art electrocatalyst towards hydrogen evolution reaction(HER),but its atom-utilization efficiency and durability need to be further improved.In this work,we prepared the highly dispersed Pt atoms supported on defects-rich Ru nanoparticles substrate(Ru NPs@Pt)by substrate-enhanced electroless deposition method.The results of single electron paramagnetic resonance confirm the existence of the defects on Ru NPs substrate and the X-ray diffraction combined with transmission electron microscopy reveals the highly dispersed Pt atoms.Exchange current density of HER on the Ru NPs@Pt is up to 2.39 mA/cm2,which is significantly higher than that of commercial Pt/C,demonstrating the boosted HER intrinsic activity.Mass activity is as high as 32.34 A/mgPt that is 9.37 times higher than that of Pt/C at an overpotential of 50 mV.Significantly,the Ru NPs@Pt delivers the greatly enhanced durability in comparison with the Pt/C one even under the ultralow Pt loading(2 µg/cm2),indicating that the defects-rich Ru NPs substrate could improve the electrocatalytic activity and durability of Pt simultaneously.
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