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首页> 外文期刊>RSC Advances >Iron encapsulated nitrogen and sulfur co-doped few layer graphene as a non-precious ORR catalyst for PEMFC application
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Iron encapsulated nitrogen and sulfur co-doped few layer graphene as a non-precious ORR catalyst for PEMFC application

机译：铁包封的氮和硫共掺杂少数层石墨烯作为PEMFC应用的非珍贵ORR催化剂

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摘要

A novel strategy was followed to prepare an iron nanoparticle encapsulated nitrogen and sulfur co-doped few layer graphene (Fe-NSG) non precious electrocatalyst. For this purpose, initially graphite oxide was coated with the polyelectrolyte poly-(sodium 4-styrenesulfonate), followed by the nitrogen-containing polymer polyaniline. An iron precursor was added to this suspension and heated to 300 degrees C in a hydrogen atmosphere. The final heating of this nanocomposite at 900 degrees C in a N-2 atmosphere and further acid leaching gave a non-precious Fe-NSG catalyst. X-ray photoelectron spectroscopy (XPS) data of the Fe-NSG catalyst illustrates the presence of a large amount of pyridinic and graphitic nitrogen species within the catalyst along with sulfur species. Half-cell and full cell electrochemical measurements prove the four electron transfer pathway of the oxygen reduction reaction with a high current density in an acidic environment. The special confined morphology of Fe nanoparticles within the graphene layers suppresses the agglomeration and dissolution of particles and gives long term durability. The present study illustrates a non-precious electrocatalyst for proton exchange membrane fuel cells with promising performance and stability.
机译：采用一种新型策略，制备铁纳米粒子包封的氮和硫共掺杂的少数层石墨烯（Fe-NSG）非珍贵的电催化剂。为此目的，最初的石墨氧化物涂有聚电解质聚 - （4-苯乙烯磺酸钠），然后用含氮聚合物聚苯胺涂覆。将铁前体加入到该悬浮液中并在氢气氛中加热至300℃。在900℃下在N-2大气中的最终加热该纳米复合材料和进一步的酸浸出给出非珍贵的Fe-NSG催化剂。 Fe-NSG催化剂的X射线光电子能谱（XPS）数据显示在催化剂中存在大量的吡啶碱和石墨氮物质以及硫种类。半电池和全细胞电化学测量证明了在酸性环境中具有高电流密度的氧还原反应的四个电子转移途径。石墨烯层内的Fe纳米颗粒的特殊狭窄形态抑制了颗粒的附聚和溶解并提供了长期耐久性。本研究说明了具有有希望性能和稳定性的质子交换膜燃料电池的非珍贵电催化剂。

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  • 来源
    《RSC Advances》 |2015年第81期|共8页
  • 作者

    Vinayan B. P.; Diemant Thomas; Behm R. Juergen; Ramaprabhu S.;

  • 作者单位

    Helmholtz Inst Ulm Electrochem Energy Storage HIU D-89081 Ulm Germany;

    Univ Ulm Inst Surface Chem &

    Catalysis D-89081 Ulm Germany;

    Helmholtz Inst Ulm Electrochem Energy Storage HIU D-89081 Ulm Germany;

    Indian Inst Technol Dept Phys NFMTC AENL Madras 600036 Tamil Nadu India;

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  • 正文语种 eng
  • 中图分类 化学;
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