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首页> 外文期刊>Nanotechnology >Surface-confinement assisted synthesis of nitrogen-rich single atom Fe-N/C electrocatalyst with dual nitrogen sources for enhanced oxygen reduction reaction
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Surface-confinement assisted synthesis of nitrogen-rich single atom Fe-N/C electrocatalyst with dual nitrogen sources for enhanced oxygen reduction reaction

机译：表面限制辅助合成富含氮的单原子Fe-N / C电催化剂，具有双氮源，用于增强氧还原反应

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摘要

The utilization of earth abundant iron and nitrogen doped carbon as a precious-metal-free electrocatalyst for oxygen reduction reaction (ORR) significantly depends on the rational design and construction of desired Fe-N-x moieties on carbon substrates, which however remains an enormous challenge. Herein a typical nanoporous nitrogen-rich single atom Fe-N/C electrocatalyst on carbon nanotube (NR-CNT@FeN-PC) was successfully prepared by using CNT as carbon substrate, polyaniline (PANI) and dicyandiamine (DCD) as binary nitrogen sources and silica-confinement-assisted pyrolysis, which not only facilitate rich N-doping for the inhibition of the Fe agglomeration and the formation of single atom Fe-N-x sites in carbon matrix, but also generate more micropores for enlarging BET specific surface area (up to 1500 m(2).g(-1)). Benefiting from the advanced composition, nanoporous structure and surface hydrophilicity to guarantee the sufficient accessible active sites for ORR, the NR-CNT@FeN-PC catalyst under optimized conditions delivers prominent ORR performance with a half-wave potential (0.88 V versus RHE) surpass commercial Pt/C catalyst by 20 mV in alkaline electrolyte. When assembled in a home-made Zn-air battery device as cathodic catalyst, it achieved a maximum output power density of 246 mW.cm(-2) and a specific capacity of 719 mA.h.g(Zn)(-1) outperformed commercial Pt/C catalyst, holding encouraging promise for the application in metal-air batteries.
机译：在氧还原反应（ORR）中，利用富含稀土的铁和氮掺杂碳作为无贵金属电催化剂在很大程度上取决于在碳衬底上合理设计和构建所需的Fe-N-x部分，然而这仍然是一个巨大的挑战。本文介绍了一种典型的碳纳米管（NR）上的纳米多孔富氮单原子Fe-N/C电催化剂-CNT@FeN-以碳纳米管（CNT）为碳基体，聚苯胺（PANI）和双氰胺（DCD）为二元氮源，二氧化硅约束辅助热解成功制备了聚碳酸酯（PC），这不仅有助于富氮掺杂抑制铁的团聚和碳基体中单原子Fe-N-x位点的形成，但也会产生更多微孔，以扩大BET比表面积（高达1500 m（2））。g（-1））。得益于先进的组成、纳米多孔结构和表面亲水性，确保ORR的活性中心充足，NR-CNT@FeN-在优化条件下，PC催化剂具有显著的ORR性能，在碱性电解液中，其半波电位（0.88 V vs RHE）比市售Pt/C催化剂高20 mV。在自制的锌-空气电池装置中作为阴极催化剂组装时，其最大输出功率密度达到246MW。cm（-2），比容量719 mA。h、 g（Zn）-1催化剂的性能优于商用Pt/C催化剂，在金属空气电池中的应用前景令人鼓舞。

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  • 来源
    《Nanotechnology》 |2021年第30期|共12页
  • 作者

    Cui Yaqi; Xu Jiaoxing; Zhao Yi; Guan Lunhui;

  • 作者单位

    Chinese Acad Sci Fujian Inst Res Struct Matter Fujian Prov key Lab Nanomat CAS Key Lab Design &

    Assembly Funct Nanostruct Fuzhou 350108 Fujian Peoples R China;

    Chinese Acad Sci Fujian Inst Res Struct Matter Fujian Prov key Lab Nanomat CAS Key Lab Design &

    Assembly Funct Nanostruct Fuzhou 350108 Fujian Peoples R China;

    Chinese Acad Sci Fujian Inst Res Struct Matter Fujian Prov key Lab Nanomat CAS Key Lab Design &

    Assembly Funct Nanostruct Fuzhou 350108 Fujian Peoples R China;

    Chinese Acad Sci Fujian Inst Res Struct Matter Fujian Prov key Lab Nanomat CAS Key Lab Design &

    Assembly Funct Nanostruct Fuzhou 350108 Fujian Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    single-atom Fe-N/C electrocatalyst; binary nitrogen sources; surface-confined pyrolysis; ORR; primary Zn-air battery;

    机译：单原子Fe-N/C电催化剂;二元氮源;表面约束热解;奥尔;锌空气原电池;

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