Fabrication of van der Waals Heterostructured FePSe3/Carbon Hybrid Nanosheets for Sodium Storage with High Performance
Fabrication of van der Waals Heterostructured FePSe3/Carbon Hybrid Nanosheets for Sodium Storage with High Performance
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用于高性能钠存储的范德华异质结构 FePSe3/碳杂化纳米片的制备
DOI：
10.1021/acsami.0c16396
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发表时间：
2020
影响因子：
9.5
通讯作者：
Qing Yang
中科院分区：
文献类型：
--
作者：
Shiqi Xing;Jing Yang;Chunde Wang;Jianbin Zhou;Jinhui Zhang;Li Zhang;Qing Yang
铁磷三硒化合物(FePSe3)以其有趣的层状几何结构、电子结构和物理化学性质在能源领域具有广泛的应用前景，但由于其制备时间长达7天以上，限制了其在实际应用中的应用。本文报道了以二茂铁、红磷和硒为原料，在石英管中通过600℃的热解反应，首次合成了包覆石墨炭的铁磷三硒化物纳米晶(FePSe3/C)的高质量片状杂化材料，反应时间显著缩短至24小时甚至30分钟。研究表明，层状FePSe3/C杂化纳米片中FePSe3的组成相为三方相，除大块晶体外，杂化纳米片的厚度约为15 nm。层状FePSe3/C杂化纳米片作为半电池钠离子电池的正极，表现出优异的性能。通常，当电流密度设置为50 mAg-1时，混合纳米片组装的电池在超过50次循环后的容量为182.7 mA h g-1，在0.8-2.2V的电压窗口中以1Ag-1的速度循环200次后容量为142 mA h g-1。同时，在本研究中，层状FePSe3/C杂化纳米片在较大的电流密度下也表现出很高的倍率性能，在0.5A g-1和5A g-1的典型性能条件下，分别为172和95 mA h g-1。
Iron phosphorus triselenide (FePSe3) is attractive for energy applications owing to its interesting layered geometry, electronic structure, and physiochemical property, while it is limited in actual application because of a very long fabrication time of over 7 days. Herein, we report a new synthetic route to a high-quality sheetlike hybrid of iron phosphorus triselenide nanocrystals coated with graphitic carbon (FePSe3/C) as an alternative kind of van der Waals heterostructures for the first time via a pyrolytic process at 600 °C from the precursors of ferrocene, red phosphorus, and selenium in a quartz tube with a significantly shortened reaction time of 24 h and even down to 30 min. Investigations demonstrated that the component phase of FePSe3in the layered FePSe3/C hybrid nanosheets is the rhombohedral phase, and the hybrid nanosheets other than bulk crystals are about 15 nm in thickness. Acting as a cathode in fabricating half-cell sodium-ion batteries, the layered FePSe3/C hybrid nanosheets exhibited remarkable performance. Typically, when current density was set as 50 mA g–1, the hybrid nanosheet-assembled battery exhibited a capacity of 182.7 mA h g–1after performing over 50 cycles, and the nanosheet battery exhibited a capacity of 142 mA h g–1after performing for 200 cycling trials at 1 A g–1in the 0.8–2.2 V voltage window. Meanwhile, the layered FePSe3/C hybrid nanosheets also exhibited very high rate capabilities at a relatively large current density in the present study, that is, 172 and 95 mA h g–1under typical performing conditions at 0.5 and 5 A g–1, respectively.