富缺陷Ru纳米片驱动高分散Pt催化剂增强电催化析氢性能

DEFECTS-RICH Ru NANOPLATE DRIVED HIGHLY DISPERSED Pt ATOMS TO BOOST HYDROGEN EVOLUTION REACTION

采用无电沉积方法,以富缺陷片状Ru纳米颗粒(Ru NPs)为基底,制备出高度分散Pt负载在Ru表面的催化剂(Ru NPs@Pt)。单电子顺磁共振实验证明了缺陷Ru的存在,X射线衍射和透射电镜的结果证实了高分散原子或亚纳米Pt的存在。所制备的电催化剂HER交换电流密度高达2.39 mA/cm^(2),明显高于商业化Pt/C;50 mV过电位下质量活性高达32.34 A/mgPt,是商业化Pt/C的9.37倍,且在低载量(2μg/cm^(2))下表现出远超商业化Pt/C的稳定性,证明了缺陷Ru基底对Pt电催化性能及耐久性的提升作用。

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/cm^(2),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(2μg/cm^(2)),indicating that the defects-rich Ru NPs substrate could improve the electrocatalytic activity and durability of Pt simultaneously.