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首页> 外文期刊>ACS applied materials & interfaces >Iron Telluride-Decorated Reduced Graphene Oxide Hybrid Microspheres as Anode Materials with Improved Na-Ion Storage Properties
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Iron Telluride-Decorated Reduced Graphene Oxide Hybrid Microspheres as Anode Materials with Improved Na-Ion Storage Properties

机译:碲化铁修饰的还原氧化石墨烯杂化微球作为阳极材料,具有改善的钠离子存储性能

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摘要

Transition-metal telluride materials are studied as the anode materials for Na-ion batteries (NIBs). The FeTe2-reduced graphene oxide (rGO) hybrid powders (first target material) are prepared via spray pyrolysis and subsequent tellurization. The H2Te gas treatment transforms the Fe3O4 rGO powders to FeTe2-rGO hybrid powders with FeTe2 nanocrystals (various sizes <100 nm) embedded within the rGO. The FeTe2-rGO hybrid powders contain 5 wt % rGO. The Na-ion storage mechanism for FeTe2 in NIBS is described by FeTe2 + 4Na(+) + 4e(-)<-> Fe + 2Na(2)Te. The FeTe2-rGO hybrid discharge process forms metallic Fe nanocrystals and Na2Te by a conversion reaction of FeTe2 with Na ions. The discharge capacities of the FeTe2-rGO hybrid powders for the first and 80th cycles are 493 and 293 mA h g(-1), respectively. The discharge capacities of the bare FeTe2 powders for the first and 80th cycles are 462 and 83 mA h g(-1), respectively. The FeTe2-rGO hybrid powders have superior Na-ion storage properties compared to bare FeTe, powders owing to their high structural stability and electrical conductivity.
机译:研究了过渡金属碲化物材料作为钠离子电池(NIB)的负极材料。经由喷雾热解和随后的碲化制备FeFe 2-还原的氧化石墨烯(rGO)杂化粉末(第一目标材料)。 H2Te气体处理将Fe3O4 rGO粉末转变为FeTe2-rGO杂化粉末,其中FeTe2纳米晶体(尺寸小于100 nm)嵌入rGO中。 FeTe2-rGO杂化粉末包含5重量%的rGO。通过FeTe2 + 4Na(+)+ 4e(-)-Fe + 2Na(2)Te可以描述NIBS中FeTe2的Na离子存储机理。 FeTe2-rGO混合放电过程通过FeTe2与Na离子的转化反应形成金属Fe纳米晶体和Na2Te。 FeTe2-rGO杂粉的第一个和第80个循环的放电容量分别为493和293 mA h g(-1)。 FeTe2裸粉在第一个和第80个循环中的放电容量分别为462和83 mA h g(-1)。 FeTe2-rGO杂化粉末由于具有高结构稳定性和导电性,因此与裸FeTe粉末相比具有优异的Na离子存储性能。

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