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  • Engineering the electronic structure of single atom Ru sites via compressive strain boosts acidic water oxidation electrocatalysis
  • Single-atom precious metal catalysts hold the promise of perfect atom utilization, yet control of their activity and stability remains challenging. Here we show that engineering the electronic structure of atomically dispersed Ru1 on metal supports via compressive strain boosts the kinetically sluggish electrocatalytic oxygen evolution reaction (OER), and mitigates the degradation of Ru-based electrocatalysts in an acidic electrolyte. We construct a series of alloy-supported Ru1 using different PtCu alloys through sequential acid etching and electrochemical leaching, and find a volcano relation between OER activity and the lattice constant of the PtCu alloys. Our best catalyst, Ru1–Pt3Cu, delivers 90 mV lower overpotential to reach a current density of 10 mA cm−2, and an order of magnitude longer lifetime over that of commercial RuO2. Density functional theory investigations reveal that the compressive strain of the Ptskin shell engineers the electronic structure of the Ru1, allowing optimized binding of oxygen species and better resistance to over-oxidation and dissolution.
  • Thermal Emitting Strategy to Synthesize Atomically Dispersed Pt Metal Sites from Bulk Pt Metal
  • Developing a facile route to access active and well-defined single atom sites catalysts has been a major area of focus for single atoms catalysts (SACs). Herein, we demonstrate a simple approach to generate atomically dispersed platinum via a thermal emitting method using bulk Pt metal as a precursor, significantly simplifying synthesis routes and minimizing synthesis costs. The ammonia produced by pyrolysis of Dicyandiamide can coordinate with platinum atoms by strong coordination effect. Then, the volatile Pt(NH3)x can be anchored onto the surface of defective graphene. The as-prepared Pt SAs/DG exhibits high activity for the electrochemical hydrogen evolution reaction and selective oxidation of various organosilanes. This viable thermal emitting strategy can also be applied to other single metal atoms, for example, gold and palladium. Our findings provide an enabling and versatile platform for facile accessing SACs toward many industrial important reactions.
News
  • 恭喜赵长明于西安获得 Inorganic Chemistry Frontiers Poster Prize 2019/3/31
  • 恭喜屈云腾于西安获得 Joule Poster Award 2019/3/31
  • 实验室成员参加西安 2019International Symposium on Electrocatalysis and Electrosynthesis 2019/3/29
  • 欢迎18级研究生韩霄、国文馨、王秋萍、颜牧雨加入 2018/9/01
  • 欢迎博士后葛骁、杜俊毅、王志远、胡宜栋、熊灿、杨佳、周霄、祝泽周加入 2018/2
  • 欢迎18级博士生薛正刚加入 2018/9/01
  • 欢迎17级研究生王文玉、孙荣博、陈敏、晋本金、周方耀加入 2017/9/01
  • 欢迎17级博士生赵亚飞、周煌加入 2017/9/01
  • 欢迎博士后加入李智君、屈云腾、杨正坤、周奇加入 2017/9/01
  • 实验室成员前往北京参加China nano会议 2017/8/29
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Yuen Wu