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Co3Fe7/nitrogen-doped graphene nanoribbons as bi-functional electrocatalyst for oxygen reduction and oxygen evolution

机译：CO3FE7 /氮气掺杂石墨烯纳米作为双功能电催化剂，用于氧还原和氧气进化

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摘要

In this work, we report a one-pot solvothermal strategy to synthesize Co3Fe7 incorporated graphene nanoribbons (Co3Fe7). An improved bi-functional electrocatalytic activity over the traditional electrocatalysts is exhibited by the Co3Fe7/nitrogen-doped graphene nanoribbon (NGNR) composite. For instance, this composite Co3Fe7/NGNRs depicted a lower overpotential of 350 mV than NGNRs (380 mV) and IrO2 (450 mV) to sustain 10 mA cm(-2) for an oxygen evolution reaction in 1.0 M KOH. Furthermore, during an oxygen reduction reaction, the catalyst exhibited a four-electron pathway and it is interesting to note that its electrocatalytic behavior is on a par with commercial Pt/C. The enhancement in the electrochemical performance can be attributed to the synergistic effect that stems from the electrocatalytically active nitrogen atoms and metal alloy nanoparticles distributed uniformly over the graphene matrix. This unique composition of electrocatalyst is extremely beneficial for practical applications in fuel cells and metal-air batteries due to its high stability and sustained electrochemical activity.
机译：在这项工作中，我们报告一锅溶剂热策略合成Co3Fe7纳入石墨烯纳米带（Co3Fe7）。在传统的电催化剂的改进的双功能电催化活性由Co3Fe7 /氮掺杂的石墨烯纳米带（NGNR）复合展出。例如，该复合Co3Fe7 / NGNRs描绘的过电位下350毫伏的比NGNRs（380毫伏）和IrO2（450毫伏）到维持10毫安厘米（-2）在1.0M的KOH的析氧反应。另外，氧还原反应过程中，催化剂表现出四电子通路，这是有趣的是，它的电催化行为是与商业的Pt / C不相上下。在电化学性能的增强可以归因于从以上所述石墨烯基质均匀地分布在电催化活性氮原子和金属合金纳米颗粒茎协同效应。这种独特的电催化剂组合物用于燃料电池和金属 - 空气电池的实际应用非常有益的，由于其高稳定性和持续电化学活性。

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