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首页> 外文期刊>Advanced Functional Materials >Novel Platinum-Cobalt Alloy Nanoparticles Dispersed on Nitrogen-Doped Graphene as a Cathode Electrocatalyst for PEMFC Applications
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Novel Platinum-Cobalt Alloy Nanoparticles Dispersed on Nitrogen-Doped Graphene as a Cathode Electrocatalyst for PEMFC Applications

机译：新型铂-钴合金纳米颗粒分散在氮掺杂石墨烯上作为PEMFC应用的阴极电催化剂

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摘要

A novel synthesis procedure is devised to obtain nitrogen-doping in hydrogen-exfoliated graphene (HEG) sheets. An anionic polyelectrolyte-conducting polymer duo is used to form a uniform coating of the polymer over graphene sheets. Pyrolysis of graphene coated with polypyrrole, a nitrogen-containing polymer, in an inert environment leads to the incorporation of nitrogen atoms in the graphene network with simultaneous removal of the polymer. These nitrogen-doped graphene (N-HEG) sheets are used as catalyst support for dispersing platinum and platinum-cobalt alloy nanoparticles synthesized by the modified-polyol reduction method, yielding a uniform dispersion of the catalyst nanoparticles. Compared to commercial Pt/C electrocatalyst, Pt-Co/N-HEG cathode electrocatalyst exhibits four times higher power density in proton exchange membrane fuel cells, which is attributed to the excellent dispersion of Pt-Co alloy nanoparticles on the N-HEG support, the alloying effect of Pt-Co, and the high electrocatalytic activity of the N-HEG support. A stability study shows that Pt/N-HEG and Pt-Co/N-HEG cathode electrocatalysts are highly stable in acidic media. The study shows two promising electrocatalysts for proton exchange membrane fuel cells, which on the basis of performance and stability present the possibility of replacing contemporary electrocatalysts.
机译：设计了一种新颖的合成方法，以在氢剥落的石墨烯（HEG）片材中获得氮掺杂。阴离子型导电聚电解质二重体用于在石墨烯片上形成聚合物的均匀涂层。在惰性环境中，用聚吡咯（一种含氮聚合物）包覆的石墨烯的热解导致氮原子掺入石墨烯网络中，同时去除聚合物。这些氮掺杂石墨烯（N-HEG）片用作催化剂载体，以分散通过改性多元醇还原法合成的铂和铂-钴合金纳米颗粒，从而使催化剂纳米颗粒均匀分散。与市售Pt / C电催化剂相比，Pt-Co / N-HEG阴极电催化剂在质子交换膜燃料电池中的功率密度高四倍，这归因于Pt-Co合金纳米颗粒在N-HEG载体上的优异分散性， Pt-Co的合金化作用以及N-HEG载体的高电催化活性。稳定性研究表明，Pt / N-HEG和Pt-Co / N-HEG阴极电催化剂在酸性介质中高度稳定。研究显示了两种有前途的质子交换膜燃料电池用电催化剂，基于性能和稳定性，它们有可能替代现代电催化剂。

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  • 来源
    《Advanced Functional Materials》 |2012年第16期|p.3519-3526|共8页
  • 作者

    Bhaghavathi P. Vinayan; Rupali Nagar; Natarajan Rajalakshmi; Sundara Ramaprabhu;

  • 作者单位

    Alternative Energy and Nanotechnology Laboratory (AENL) Nano Functional Materials Technology Centre (NFMTC) Department of Physics, IITM, Chennai 600036, India;

    Alternative Energy and Nanotechnology Laboratory (AENL) Nano Functional Materials Technology Centre (NFMTC) Department of Physics, IITM, Chennai 600036, India;

    Centre for Fuel Cell Technology International Advanced Research Centre for Powder Metallurgy and New Materials ARCI, NT Madras Research Park Taramani, Chennai 600 113, India;

    Alternative Energy and Nanotechnology Laboratory (AENL) Nano Functional Materials Technology Centre (NFMTC) Department of Physics, IITM, Chennai 600036, India;

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