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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Correlations between electrochemical Na+ storage properties and physiochemical characteristics of holey graphene nanosheets
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Correlations between electrochemical Na+ storage properties and physiochemical characteristics of holey graphene nanosheets

机译：多孔石墨烯纳米片的电化学Na +储存特性与理化特性的相关性

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摘要

Pores and surface functional groups are endowed on graphene nanosheets (GNSs) to improve their electrochemical Na+ storage properties. An optimal capacity of 220 mA g(-1) is obtained (at a charge-discharge rate of 0.03 A g(-1)) in ethylene carbonate/diethyl carbonate mixed electrolyte containing 1 M NaClO4. Ex situ X-ray photoelectron spectroscopy and synchrotron X-ray diffraction techniques are employed to study the electrode charge storage mechanism. The results indicate that reversible surface redox reactions at the electrode surface are the predominant processes affecting charge storage in a potential range of 0.5-2.0 V (vs. Na/Na+), whereas Na+ intercalation/deintercalation between carbon layers occurs at lower potentials. When the charge-discharge rate was increased by >300 fold (to 10 A g(-1)), a capacity as high as 85 mA h g(-1) is obtained, reflecting the excellent rate capability of the electrode. The physiochemical characteristics that affect the Na+ storage performance are explored. A highly promising GNS anode for sodium-ion batteries is proposed.
机译：孔和表面官能团被赋予石墨烯纳米片（GNS），以改善其电化学Na +储存性能。在含有1 M NaClO4的碳酸亚乙酯/碳酸二乙酯混合电解质中，可获得220 mA g（-1）的最佳容量（充放电率为0.03 A g（-1））。异位X射线光电子能谱和同步加速器X射线衍射技术被用来研究电极电荷存储机制。结果表明，电极表面的可逆表面氧化还原反应是影响电荷存储的主要过程，该过程在0.5-2.0 V（vs。Na / Na +）的电势范围内，而碳层之间的Na +嵌入/去嵌入发生在较低电势下。当充放电速率增加> 300倍（至10 A g（-1））时，可获得高达85 mA h g（-1）的容量，反映了电极极好的速率能力。探索了影响Na +储存性能的理化特性。提出了一种极有希望的用于钠离子电池的GNS阳极。

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