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Nb2O5/graphene nanocomposites for electrochemical energy storage

机译：Nb2O5 /石墨烯纳米复合材料用于电化学储能

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摘要

The development of electrode materials for energy storage, with high energy and power densities along with good cyclic stability, still remains a big challenge. Here we report the synthesis of Nb2O5/graphene nanocomposites, through a simple hydrothermal method, with Nb2O5 nanoparticles anchored on reduced graphene oxide (RGO) sheets. The fabricated Nb2O5/graphene electrodes exhibited an excellent electrochemical performance when studied as anodes for lithium-ion batteries, with a superior reversible capacity and high power capability (192 mA h g(-1) under 0.1C rate over 50 cycles). Signature curve studies showed high power capability of the Nb2O5/graphene electrode with similar to 80% of the total capacity retained at 16C rate compared to similar to 30% retention for pristine Nb2O5 nanoparticles. To achieve further improvement in energy density and power capability, Li-ion hybrid electrochemical capacitors (Li-HECs) were fabricated with the Nb2O5/graphene nanocomposite as the anode and rice husk-derived activated porous carbon as the cathode, in non-aqueous electrolyte. The Li-HECs showed enhanced electrochemical performance with high energy density of 30 W h kg(-1), at a specific power density of 500 W kg(-1). The Nb2O5/graphene nanocomposites show promising results and hence have great potential for application in efficient electrochemical energy storage devices.
机译：具有高能量和功率密度以及良好的循环稳定性的用于能量存储的电极材料的开发仍然是巨大的挑战。在这里，我们报告了通过简单的水热法合成Nb2O5 /石墨烯纳米复合材料的过程，其中Nb2O5纳米粒子锚固在还原的氧化石墨烯（RGO）板上。 Nb2O5 /石墨烯电极作为锂离子电池的阳极进行研究时，具有优异的电化学性能，具有优异的可逆容量和高功率容量（在50循环内于0.1C速率下为192 mA h g（-1））。签名曲线研究表明，Nb2O5 /石墨烯电极的高功率能力在16C速率下保留了约80％的总容量，而对于原始Nb2O5纳米颗粒则保留了约30％的功率。为了进一步提高能量密度和功率能力，在非水电解质中，以Nb2O5 /石墨烯纳米复合材料为阳极，以稻壳衍生的活性多孔碳为阴极，制备了锂离子混合电化学电容器（Li-HEC）。 。 Li-HEC在500 W kg（-1）的比功率密度下显示出增强的电化学性能，具有30 W h kg（-1）的高能量密度。 Nb2O5 /石墨烯纳米复合材料显示出令人鼓舞的结果，因此具有在高效电化学储能装置中应用的巨大潜力。

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