Huang Yunxia, Cheng Ming, Xiang Zhongcheng, Cui Yimin
Department of Physics, Beihang University, Beijing 100191, People's Republic of China.
R Soc Open Sci. 2018 Sep 12;5(9):180953. doi: 10.1098/rsos.180953. eCollection 2018 Sep.
Herein, porous NiCoS/CNTs nanocomposites were synthesized via a simple hydrothermal method followed by the sulphurization process using different sulfide sources. By comparing two different sulfur sources, the samples using thioacetamide as sulfide source delivered more remarkable electrochemical performance with a high specific capacitance of 1765 F g at 1 A g and an admirable cycling stability with capacitance retention of 71.7% at a high current density of 10 A g after 5000 cycles in 2 M KOH aqueous electrolyte. Furthermore, an asymmetric supercapacitor (ASC) device was successfully fabricated with the NiCoS/CNTs electrode as the positive electrode and graphene as the negative electrode. The device provided a maximum energy density of 29.44 W h kg at a power density of 812 W kg. Even at a high power density of 8006 W kg, the energy density still reaches 16.68 W h kg. Moreover, the ASC presents 89.8% specific capacitance retention after 5000 cycles at 5 A g. These results reveal its great potential for supercapacitors in electrochemical energy storage field.
在此，通过简单的水热法合成了多孔NiCoS/CNTs纳米复合材料，随后使用不同的硫化物源进行硫化过程。通过比较两种不同的硫源，使用硫代乙酰胺作为硫化物源的样品表现出更优异的电化学性能，在1 A g下具有1765 F g的高比电容，并且在2 M KOH水性电解质中以10 A g的高电流密度循环5000次后具有令人钦佩的循环稳定性，电容保持率为71.7%。此外，成功制备了一种不对称超级电容器（ASC）器件，以NiCoS/CNTs电极作为正极，石墨烯作为负极。该器件在812 W kg的功率密度下提供了29.44 W h kg的最大能量密度。即使在8006 W kg的高功率密度下，能量密度仍达到16.68 W h kg。此外，该ASC在5 A g下循环5000次后比电容保持率为89.8%。这些结果揭示了其在电化学储能领域超级电容器方面的巨大潜力。
