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首页> 外文期刊>Catalysis science & technology >An efficient, bifunctional catalyst for lithium-oxygen batteries obtained through tuning the exterior Co2+/Co3+ ratio of CoOx on N-doped carbon nanofibers
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An efficient, bifunctional catalyst for lithium-oxygen batteries obtained through tuning the exterior Co2+/Co3+ ratio of CoOx on N-doped carbon nanofibers

机译：一个高效的双功能催化剂lithium-oxygen电池通过调优外部Co2 + /二氧化碳+ CoOx比n型碳纳米纤维

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摘要

The design and fabrication of efficient catalysts are urgently desired for Li-O-2 batteries to prompt both the oxygen reduction reaction and oxygen evolution reaction. Morphology/surface optimization can be intensively applied to enhance the catalytic activity of specific materials. Herein, we propose an electrospinning method followed by heat treatment to fabricate CoOx nanoparticles on N-doped carbon nanofibers (CoOx@NCF). Significantly, the electrocatalytic activity can be largely improved through modulating the exterior Co2+/Co3+ ratio by controlling the heat-treatment process. The prepared CoOx nanoparticles possess high uniformity together with good dispersion, which integrates the advantages of morphology and surface properties, making them an effective active catalyst for Li-O-2 batteries. The cell with the CoOx@NCF catalyst shows impressively good performance towards the ORR and OER with a high initial discharge capacity (7763.7 mA h g(-1)), enhanced cycling stability, desirable rate capability and relatively low overpotential. Moreover, the result of LSV indicates that CoOx@NCF enables the decomposition of the side product LiOH efficiently. In addition, the CoOx@NCF catalyst is capable of forming nanosheet-like Li2O2, which is much easier to decompose, compared with toroidal-like Li2O2. The boosted cycling life can be attributed to the synergistic effect of architecture design and surface engineering.
机译：高效催化剂的设计和制造迫切期望Li-O-2电池氧还原反应和提示氧发生反应。可以集中应用于优化提高特定的催化活性材料。其次是热处理制造方法CoOx纳米颗粒在n型碳纳米纤维(CoOx@NCF)。活动可以很大程度上提高调节外部Co2 + /二氧化碳+比率控制热处理过程。准备CoOx纳米颗粒具有高均匀分散好,一起结合形态学和的优点表面性质,使其有效活跃的催化剂Li-O-2电池。与CoOx@NCF催化剂显示了令人印象深刻的向奥尔和OER良好的性能马高初始放电容量(7763.7 hg(1)),增强循环稳定,可取的速度能力和相对较低的过电压。此外,LSV表明的结果CoOx@NCF使分解产品LiOH效率。CoOx@NCF催化剂能够形成nanosheet-like Li2O2,这更容易分解,而toroidal-like Li2O2。提高自行车生活可以归因于协同效应的设计和架构表面工程。

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