Iron-based electrodes have attracted great attention for sodium storage because of the distinct cost effectiveness. However, exploring suitable iron-based electrodes with high power density and long duration remains a big challenge. Herein, a spray-drying strategy is adopted to construct graphene-coated Na_2.4Fe_1.8(SO₄)₃ nanograins in a 3D graphene microsphere network. The unique structural and compositional advantages endow these electrodes to exhibit outstanding electrochemical properties with remarkable rate performance and long cycle life. Mechanism analyses further explain the outstanding electrochemical properties from the structural aspect.

中文翻译：

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由3D石墨烯网络中石墨烯包覆的Na _2.4 Fe _1.8（SO ₄）₃纳米颗粒组成的先进低成本阴极，用于超稳定钠存储

铁基电极因其独特的成本效益而吸引了钠的存储。然而，探索具有高功率密度和长持续时间的合适的铁基电极仍然是巨大的挑战。在本文中，采用喷雾干燥策略在3D石墨烯微球网络中构建石墨烯包覆的Na _2.4 Fe _1.8（SO ₄）₃纳米颗粒。独特的结构和成分优势赋予这些电极以优异的速率性能和长循环寿命，显示出出色的电化学性能。机理分析从结构方面进一步解释了出色的电化学性能。