Li Junxian, Zhao Jianwei, Qin Lirong, Zhang Qitao, Tang Xiaolan, Xu Yingying
School of Physical Science and Technology, Southwest University Chongqing 400715 P. R. China
RSC Adv. 2020 Jun 12;10(38):22606-22615. doi: 10.1039/d0ra03253k. eCollection 2020 Jun 10.
Hierarchical Co(OH)@NiMoS nanocomposites were successfully prepared on a carbon cloth by using a simple two-step hydrothermal method coupled with a room-temperature vulcanization method. The resulting nanocomposites were composed of large-scale uniform Co(OH) nanowires fully covered with ultrathin vertical NiMoS nanoflakes. Because of the synergetic effect between Co(OH) and NiMoS, the nanocomposites exhibited good electrochemical performance as a supercapacitor electrode. In particular, a specific capacity of 2229 F g was achieved at a current density of 1 A g. In addition, an asymmetrical supercapacitor fabricated using activated carbon as the negative electrode and the as-synthesised nanocomposite as the positive electrode exhibited a maximum energy density of 59.5 W h kg at a power density of 1 kW h kg and excellent cycling stability (100% capacitance retention after 5000 cycles). These results indicate that the hierarchical Co(OH)@NiMoS nanocomposite has great potential for practical application in high-performance energy storage devices.
通过简单的两步水热法结合室温硫化法，在碳布上成功制备了分层的Co(OH)@NiMoS纳米复合材料。所得纳米复合材料由大规模均匀的Co(OH)纳米线组成，这些纳米线完全被超薄的垂直NiMoS纳米薄片覆盖。由于Co(OH)和NiMoS之间的协同效应，该纳米复合材料作为超级电容器电极表现出良好的电化学性能。特别是，在电流密度为1 A g时，比电容达到2229 F g。此外，以活性炭为负极、合成的纳米复合材料为正极制备的不对称超级电容器，在功率密度为1 kW h kg时表现出最大能量密度为59.5 W h kg，并且具有优异的循环稳定性（5000次循环后电容保持率为100%）。这些结果表明，分层的Co(OH)@NiMoS纳米复合材料在高性能储能器件的实际应用中具有巨大潜力。
