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首页> 外文期刊>Nanotechnology >Metal-free N-doped carbon nanofibers as an efficient catalyst for oxygen reduction reactions in alkaline and acid media
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Metal-free N-doped carbon nanofibers as an efficient catalyst for oxygen reduction reactions in alkaline and acid media

机译：无金属N掺杂的碳纳米纤维作为碱性和酸介质中的氧还原反应的有效催化剂

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The development of metal-free catalysts to replace the use of Pt has played an important role in relation to its application to fuel cells. We report N-doped carbon nanofibers as the catalyst of an oxygen reduction reaction, which were synthesized via carbonizing bacterial cellulose-polypyrrole composites. The as-prepared material exhibited remarkable catalytic activity toward the oxygen reduction reaction with comparable onset potential and the ability to limit the current density of commercial Pt/C catalysts in both alkaline and acid media due to the unique porous three-dimensional network structure and the doped nitrogen atoms. The effect of N functionalities on catalytic behavior was systematically investigated. The results demonstrated that pyridinic-N was the dominating factor for catalytic performance toward the oxygen reduction reaction. Additionally, N-doped carbon nanofibers also demonstrated excellent cycling stability (93.2% and 89.4% retention of current density after chronoamperometry 20 000 s in alkaline and media, respectively), obviously superior to Pt/C.
机译：无金属催化剂的替代使用PT的开发在与其在燃料电池的应用中起着重要作用。我们将N-掺杂的碳纳米纤维报告为氧还原反应的催化剂，通过碳化细菌纤维素 - 聚吡咯复合材料合成。由于独特的多孔三维网络结构和酸介质中的商业Pt / C催化剂的电流密度，所制备的材料朝向氧还原反应表现出显着的催化活性。由于独特的多孔三维网络结构，并且掺杂的氮原子。系统研究了N函数对催化行为的影响。结果表明，吡啶-N是催化性能朝向氧还原反应的主导因子。另外，N掺杂的碳纳米纤维还显示出优异的循环稳定性（分别在碱性和培养基中的计时率20 000秒后的电流密度为93.2％和89.4％，显然优于Pt / c。

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