Titanium Oxynitride Nanoparticles Anchored on Carbon Nanotubes as Energy Storage Materials.
Titanium Oxynitride Nanoparticles Anchored on Carbon Nanotubes as Energy Storage Materials.
复制标题
DOI：
10.1021/acsami.5b07630
复制
发表时间：
2015-10
影响因子：
9.5
通讯作者：
Litao Yan;Gen Chen;Shuai Tan;Meng Zhou;Guifu Zou;S. Deng;S. Smirnov;Hongmei Luo
中科院分区：
文献类型：
--
作者：
Litao Yan;Gen Chen;Shuai Tan;Meng Zhou;Guifu Zou;S. Deng;S. Smirnov;Hongmei Luo
通过在600℃氨气中对非晶态TiO2 （a-TiO2）包覆碳纳米管（CNTs/a-TiO2）进行共形退火，在碳纳米管（CNTs）表面均匀形成了亚8 nm的氧化氮化钛（ti）纳米颗粒。采用x射线衍射（XRD）、高分辨率透射电子显微镜成像（HRTEM）、扫描透射电子显微镜-能量色散谱（STEM-EDX）和x射线光电子能谱（XPS）对新型CNTs/TiON纳米复合材料进行了系统表征。结果表明：Ti、O、N在纳米tio2中均匀分布；在0.5 a g（-1）电流密度下，CNTs/TiON的比电容为187 F g(-1)，远高于在氮气中450℃退火得到的CNTs/a-TiO2的比电容（33.4 F g(-1)）和CNTs/TiO2的比电容（83.4 F g(-1)）。CNTs/TiON还表现出增强的循环耐久性，这使其被认为是超级电容器的有前途的候选者。
Sub-8 nm titanium oxynitride (TiON) nanoparticles were uniformly formed on the surface of carbon nanotubes (CNTs) by annealing amorphous TiO2 (a-TiO2) conformally coated CNTs (CNTs/a-TiO2) at 600 °C in ammonia gas. The novel CNTs/TiON nanocomposite was systematically characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy imaging (HRTEM), scanning transmission electron microscopy-energy dispersive spectroscopy (STEM-EDX), and X-ray photoelectron spectroscopy (XPS). The results show that Ti, O, and N are homogeneously distributed in TiON nanoparticles. The specific capacitance of CNTs/TiON exhibits 187 F g(-1) at a current density of 0.5 A g(-1), which is much higher than that of CNTs (33.4 F g(-1)) and CNTs/TiO2 (83.4 F g(-1)) obtained by annealing CNTs/a-TiO2 at 450 °C in nitrogen gas. CNTs/TiON also exhibits enhanced cycle durability, which enables it to be considered as a promising candidate for supercapacitors.