Zhang Jian-Fang, Wang Yan, Shu Xia, Yu Cui-Ping, Xiao Ming-Feng, Cui Jie-Wu, Qin Yong-Qiang, Zheng Hong-Mei, Zhang Yong, Chen Dong, Ajayan Pulickel M, Wu Yu-Cheng
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China.
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China; Department of Material Science and Nanoengineering, Rice University, Houston, TX 77005, USA.
Sci Bull (Beijing). 2018 Mar 15;63(5):322-330. doi: 10.1016/j.scib.2018.01.024. Epub 2018 Feb 13.
A novel and unique nickel-cobalt hydroxyfluorides (NiCo-HF) nanowires material is fabricated by one-pot solvothermal synthesis method for asymmetric supercapacitor. The synthesis mechanism and factors that influence the formation of the NiCo-HF nanowires have been further discussed. The as-prepared NiCo-HF electrode exhibits a high specific capacitance of 3,372.6 F g, and the capacitance retention of 94.3% can be achieved at a high current density of 20 A g after 10,000 cycles. The outstanding electrochemical performance of the electrode can be attributed to the synergistic effect of the nanowires morphology and complicated redox process of active material. Furthermore, an asymmetric supercapacitor assembled with NiCo-HF nanowires as positive electrode and activated carbon as the negative electrode shows an ultrahigh energy density of 83.6 Wh kg at a power density of 379.4 W kg and an excellent cycling stability with 86.3% capacitance retention after 10,000 cycles, indicating that this novel material has great promise for potential application in energy storage device.
通过一锅溶剂热合成法制备了一种新型独特的镍钴羟基氟化物（NiCo-HF）纳米线材料用于不对称超级电容器。进一步讨论了NiCo-HF纳米线的合成机理及影响其形成的因素。所制备的NiCo-HF电极表现出3372.6 F g的高比电容，在20 A g的高电流密度下循环10000次后电容保持率可达94.3%。电极出色的电化学性能可归因于纳米线形态与活性材料复杂氧化还原过程的协同效应。此外，以NiCo-HF纳米线为正极、活性炭为负极组装的不对称超级电容器在功率密度为379.4 W kg时表现出83.6 Wh kg的超高能量密度，且在10000次循环后具有86.3%的电容保持率，具有出色的循环稳定性，表明这种新型材料在储能装置中具有巨大的潜在应用前景。
