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/cm2,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（2 μg/cm2）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。
Abstract
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.
关键词
电催化 /
析氢反应 /
缺陷 /
耐久性 /
Pt
Key words
electrocatalysis /
hydrogen evolution reaction /
defect /
durability /
Pt
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基金
科技部重点研发计划（2021YFB4000200）; 国家自然科学基金（22002184）
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