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Reversible surface structural changes in Pt-based bimetallic nanoparticles during oxidation and reduction cycles

机译：Pt基双金属纳米粒子在氧化和还原循环过程中可逆的表面结构变化

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摘要

The surface states of supported PtNi nanoparticles treated at alternating O_2 and H_2 atmosphere were studied by X-ray photoelectron spectroscopy. Reversible structural changes at the surfaces of the supported PtNi nanoparticles in response to reaction gases were observed, showing NiO-rich surface in oxidizing gases and Pt-rich surface in reducing gases. The dynamic behaviors can be attributed to two opposite gas-driven mass transport processes at bimetallic particle surfaces, including surface segregation of Pt at the bimetallic particles in H_2 and encapsulation of the particles by NiO in O_2. The similar surface structural changes can be observed in other bimetallic catalyst systems, as exemplified in supported PtCu and PtCo nanoparticles.
机译：通过X射线光电子能谱研究了在交替的O_2和H_2气氛下处理的PtNi纳米颗粒的表面状态。观察到响应于反应气体，在负载的PtNi纳米颗粒表面可逆的结构变化，显示氧化气体中富NiO的表面和还原气体中富Pt的表面。动力学行为可归因于在双金属颗粒表面发生的两个相反的气体驱动的传质过程，包括Pt在H_2中的双金属颗粒上的表面偏析和NiO在O_2中的包裹。可以在其他双金属催化剂体系中观察到类似的表面结构变化，如负载型PtCu和PtCo纳米颗粒中的例子。

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  • 来源
    《Applied Surface Science》 |2009年第16期|7296-7301|共6页
  • 作者

    Rentao Mu; Qiang Fu; Hongyang Liu; Dali Tan; Runsheng Zhai; Xinhe Bao;

  • 作者单位

    State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, the Chinese Academy of Sciences, Zhongshan Road, Dalian 116023, PR China;

    State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, the Chinese Academy of Sciences, Zhongshan Road, Dalian 116023, PR China;

    State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, the Chinese Academy of Sciences, Zhongshan Road, Dalian 116023, PR China;

    State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, the Chinese Academy of Sciences, Zhongshan Road, Dalian 116023, PR China;

    State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, the Chinese Academy of Sciences, Zhongshan Road, Dalian 116023, PR China;

    State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, the Chinese Academy of Sciences, Zhongshan Road, Dalian 116023, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    bimetallic catalysts; dynamic surface process; oxidation; reduction; XPS;

    机译：双金属催化剂;动态表面过程氧化减少;XPS;

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