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以硝酸铁[Fe(NO3)3·9H2O,氧化剂]、柠檬酸(C6H8O7·H2O,燃料)和硝酸铵(NH4NO3,助燃剂)为原料,在空气气氛下采用溶液燃烧法(350℃,30min)一步合成纳米Fe2O3/C复合材料。研究发现,通过改变柠檬酸的用量可以引入原位碳及改变产物中Fe2O3相的组成。运用X射线衍射(XRD)、热重(TG)、SEM和TEM技术对产物的形貌和结构进行表征,通过循环伏安和恒电流充放电测试研究了Fe2O3/C纳米复合材料的电化学性能。结果表明:Fe2O3/C产物中,Fe2O3为α-Fe2O3和γ-Fe2O3的混合相,当硝酸铁和柠檬酸的摩尔比为6∶8时,合成的产物具有较大的比表面积和孔结构,原位碳均匀分布在Fe2O3纳米颗粒的周围;在1mol/L KOH溶液中,电位窗口-1~0V(vs.SCE)时,Fe2O3/C电极表现出良好的倍率和循环特性(1000次循环后,容量保持率为80.7%),在电流密度为1A/g时,其比电容为148.4F/g。
Using the method of solution combustion (350 ℃, 30min) under the air atmosphere, ferric nitrate [Fe (NO3) 3 · 9H2O, oxidant], citric acid (C6H8O7 · H2O, fuel) and ammonium nitrate (NH4NO3, One Step Synthesis of Nanometer Fe2O3 / C Composites. The study found that by changing the amount of citric acid can be introduced into situ carbon and change the product of Fe2O3 phase composition. The morphology and structure of the product were characterized by X-ray diffraction (XRD), thermogravimetry (TG), SEM and TEM. The electrochemical properties of Fe2O3 / C nanocomposites were investigated by cyclic voltammetry and galvanostatic charge-discharge test . The results show that the Fe2O3 / C product is a mixed phase of α-Fe2O3 and γ-Fe2O3. When the molar ratio of iron nitrate to citric acid is 6: 8, the synthesized product has a large specific surface area and pore structure, The in-situ carbon was uniformly distributed around the Fe2O3 nanoparticles. The Fe2O3 / C electrode exhibited good multiplication and cycling characteristics in a 1 mol / L KOH solution at potential window of -1 ~ 0 V (vs.SCE) , The capacity retention rate of 80.7%), the current density of 1A / g, the specific capacitance of 148.4F / g.