Liu Changkun, Li Qiang, Wang Xia, Xu Jie, Li Shandong
College of Physics, Laboratory of Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, and Key Laboratory of Photonics Materials and Technology in Universities of Shandong, Qingdao University, Qingdao 266071, China.
J Nanosci Nanotechnol. 2018 Mar 1;18(3):1887-1892. doi: 10.1166/jnn.2018.14248.
One-dimensional (1D) Co3O4 nanopillars were prepared by a facile hydrothermal-calcination method, which involved low thermal decomposition of Co(OH)y(CO3)0.5(2-y) · 11H2O at different temperatures. Microstructure, lithium-storage performance and the conductivity of the Co3O4 nanopillars calcined at different temperatures were systematically investigated. It was revealed that the calcined temperature has an effect on the particle size, crystallinity, and morphology of the Co3O4 nanopillars, which further influenced its electrochemical performance. It was found that when the calcined temperature and time were 450 °C and 2 h, respectively, the obtained Co3O4 nanopillars with the length of 60-100 nm and width of 30-40 nm, presented good lithium-storage performance with a high reversible capacity of 805.8 mAh g-1 after 30 cycles at a current density of 100 mA g-1. In addition, the Co3O4 nanopillars electrode possessed the smallest semicircle diameter, which implied that Co3O4 nanopillars presented the lowest contact and charge-transfer impedances, originating from its good crystallinity and 1D nanocolumnar structure.
采用简便的水热-煅烧法制备了一维（1D）Co3O4纳米柱，该方法涉及在不同温度下Co(OH)y(CO3)0.5(2-y)·11H2O的低热分解。系统研究了在不同温度下煅烧的Co3O4纳米柱的微观结构、储锂性能和导电性。结果表明，煅烧温度对Co3O4纳米柱的粒径、结晶度和形貌有影响，进而影响其电化学性能。研究发现，当煅烧温度和时间分别为450℃和2 h时，所制备的Co3O4纳米柱长度为60-100 nm，宽度为30-40 nm，在100 mA g-1的电流密度下循环30次后，具有805.8 mAh g-1的高可逆容量，表现出良好的储锂性能。此外，Co3O4纳米柱电极的半圆直径最小，这意味着Co3O4纳米柱具有最低的接触和电荷转移阻抗，这源于其良好的结晶度和一维纳米柱状结构。
