【摘要】 通过调控硝酸浓度,利用水热酸化钼酸盐溶液高产率地合成了的-αMoO3纳米纤维。并用X射线衍射(XRD)、透射电子显微镜(TEM)和高分辨透射电镜(HRTEM)等技术对其形貌和结构作了表征。结果表明,当硝酸浓度>6.73mol/L时,可制备出直径范围在50~400nm,沿[001]方向生长的正交相-αMoO3纳米纤维;硝酸浓度在2.6mol/L左右时,产物是针状的六方相MoO3;随着硝酸浓度的提高,产物由六方相MoO3向正交相MoO3过渡。对正交MoO3纳米纤维电极材料的电化学充放电测试表明,电流密度从0.195mA/cm2增至0.52mA/cm2时,首次锂插入容量降幅比通常的微米级粉体材料要小。更多还原

【Abstract】 α-MoO₃ nanobelts can be hydrothermally synthesized by acidifying solution of molybdate with nitric acid at a well-controlled concentration.X-ray diffraction,transmission electron microscopy（TEM） and high-resolution transmission electron microscopy（HRTEM） were employed to analyze the crystalline structure and morphology of the synthesized MoO₃ nanofibres.The results indicate that orthorhombic MoO₃ nanofibres with widths ranging from 50～400nm grow along direction when nitric acid concentration is above 6.3mol/L,while hexagonal MoO₃ can be obtained when nitric acid concentration is around 2.6mol/L.Galvanostatic cycling tests reveal that electrode composed of MoO₃ nanobelts shows smaller decline in first lithiation capacity than that consists of microsized MoO₃ powders when the current density increases from 0.195～0.52mA/cm².更多还原