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首页> 外文期刊>Advanced Functional Materials >Iron-Nitrogen-Doped Vertically Aligned Carbon Nanotube Electrocatalyst for the Oxygen Reduction Reaction
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Iron-Nitrogen-Doped Vertically Aligned Carbon Nanotube Electrocatalyst for the Oxygen Reduction Reaction

机译：铁氮掺杂的垂直排列碳纳米管电催化剂用于氧还原反应

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摘要

A highly active iron-nitrogen-doped carbon nanotube catalyst for the oxygen reduction reaction (ORR) is produced by employing vertically aligned carbon nanotubes (VA-CNT) with a high specific surface area and iron(II) phthalocyanine (FePc) molecules. Pyrolyzing the composite easily transforms the adsorbed FePc molecules into a large number of iron coordinated nitrogen functionalized nanographene (Fe-N-C) structures, which serve as ORR active sites on the individual VA-CNT surfaces. The catalyst exhibits a high ORR activity, with onset and half-wave potentials of 0.97 and 0.79 V, respectively, versus reversible hydrogen electrode, a high selectivity of above 3.92 electron transfer number, and a high electrochemical durability, with a 17 mV negative shift of E-1/2 after 10 000 cycles in an oxygen-saturated 0.5 m H2SO4 solution. The catalyst demonstrates one of the highest ORR performances in previously reported any-nanotube-based catalysts in acid media. The excellent ORR performance can be attributed to the formation of a greater number of catalytically active Fe-N-C centers and their dense immobilization on individual tubes, in addition to more efficient mass transport due to the mesoporous nature of the VA-CNTs.
机译：通过使用具有高比表面积的垂直排列的碳纳米管（VA-CNT）和铁（II）酞菁（FePc）分子，可以生产用于氧还原反应（ORR）的高活性铁氮掺杂碳纳米管催化剂。热解复合物很容易将吸附的FePc分子转化为大量铁配位的氮官能化纳米石墨烯（Fe-N-C）结构，这些结构在各个VA-CNT表面上充当ORR活性位点。与可逆氢电极相比，该催化剂具有较高的ORR活性，起始和半波电势分别为0.97和0.79 V，电子选择性高于3.92的高选择性，电化学耐久性高，负位移为17 mV在氧饱和的0.5 m H2SO4溶液中进行1万次循环后，产生E-1 / 2的浓度。该催化剂在以前报道的任何基于纳米管的酸性介质中显示出最高的ORR性能之一。优异的ORR性能可归因于由于VA-CNT的介孔性质，除了更有效的质量传输外，还形成了大量催化活性的Fe-N-C中心，并将其紧密固定在各个管上。

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