通过纳米尺度的 Kirkendall 扩散过程合成具有可控尺寸的空心纳米球组成的 NiO 纳米纤维及其电化学性能。
Synthesis of NiO Nanofibers Composed of Hollow Nanospheres with Controlled Sizes by the Nanoscale Kirkendall Diffusion Process and Their Electrochemical Properties.
机构信息
Department of Materials Science and Engineering, Korea University , Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea.
出版信息
ACS Appl Mater Interfaces. 2015 Nov 25;7(46):25641-7. doi: 10.1021/acsami.5b08793. Epub 2015 Nov 16.
NiO nanofibers composed of hollow NiO nanospheres with different sizes were prepared by electrospinning method. The mean size of the hollow NiO nanospheres was determined by the mean size of the Ni nanocrystals of the Ni-C composite nanofibers formed as an intermediate product. Porous-structured NiO nanofibers were also prepared as a comparison sample by direct oxidation of the electrospun nanofibers. The discharge capacities of the nanofibers composed of hollow nanospheres reduced at 300, 500, and 700 °C for the 250th cycle were 707, 655, and 261 mA h g(-1), respectively. However, the discharge capacity of the porous-structured NiO nanofibers for the 250th cycle was low as 206 mA h g(-1). The nanofibers composed of hollow nanospheres had good structural stability during cycling.
采用静电纺丝法制备了由不同尺寸的空心 NiO 纳米球组成的 NiO 纳米纤维。空心 NiO 纳米球的平均尺寸由作为中间产物形成的 Ni-C 复合纳米纤维中 Ni 纳米晶的平均尺寸决定。还通过直接氧化纺丝纳米纤维制备了多孔结构的 NiO 纳米纤维作为对比样品。在 300、500 和 700°C 下循环 250 次后，由空心纳米球组成的纳米纤维的放电容量分别为 707、655 和 261 mA h g(-1)。然而，多孔结构的 NiO 纳米纤维在 250 次循环后的放电容量较低，仅为 206 mA h g(-1)。在循环过程中，由空心纳米球组成的纳米纤维具有良好的结构稳定性。
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