Abstract Citrate-capped magnetites (cit-Fe3O4) are electrostatically conjugated with 3-aminopropyl trimethoxysilane (APS), forming APS-complexed Fe3O4 (A-Fe3O4). Atmospheric calcination induces the direct conversion of A-Fe3O4 into silica-coated Fe2O3 (Fe2O3@SiO2) while preserving its nanoscale dimension (∼15 nm). One-pot chemical etching of the Fe2O3@SiO2 leads to iron oxide particles (Fe2O3) with internal nanocavities, so called nanoporous Fe2O3. After 200 cycles at the current density of 100 mA g−1, the nanoporous Fe2O3 delivers a high reversible capacity of ∼700 mAh g−1 without distinct capacity fading. The excellent cycling stability of the nanoporous Fe2O3 is attributed to the superior buffering effect contributed by its nanoscale dimension and multiple internal nanocavities inside particles, which significantly retard the pulverization process of iron oxide particles. The facile one-pot synthesis of the nanoporous Fe2O3 is an effective, inexpensive route in designing high-performance electrode materials for sustainable energy conversion and storage applications.

中文翻译：

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用于高度可逆锂存储的具有内部纳米腔的纳米多孔 Fe 2 O 3 的简便合成

摘要 柠檬酸盐封端的磁铁矿 (cit-Fe3O4) 与 3-氨基丙基三甲氧基硅烷 (APS) 静电共轭，形成 APS 络合的 Fe3O4 (A-Fe3O4)。大气煅烧诱导 A-Fe3O4 直接转化为二氧化硅包覆的 Fe2O3（Fe2O3@SiO2），同时保持其纳米级尺寸（~15 nm）。Fe2O3@SiO2 的一锅化学蚀刻导致具有内部纳米腔的氧化铁颗粒 (Fe2O3)，即所谓的纳米多孔 Fe2O3。在 100 mA g-1 的电流密度下循环 200 次后，纳米多孔 Fe2O3 提供了约 700 mAh g-1 的高可逆容量，而没有明显的容量衰减。纳米多孔 Fe2O3 优异的循环稳定性归因于其纳米级尺寸和粒子内部多个内部纳米腔所贡献的卓越缓冲效果，显着延缓氧化铁颗粒的粉碎过程。纳米多孔 Fe2O3 的简便一锅法合成是设计用于可持续能源转换和存储应用的高性能电极材料的一种有效、廉价的途径。