State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
J Colloid Interface Sci. 2017 Dec 1;507:290-299. doi: 10.1016/j.jcis.2017.07.095. Epub 2017 Jul 27.
Hierarchical nickel sulfide (NiS) hollow microspheres can be successfully synthesized with a template-free method using α-Ni(OH) microspheres as a precursor by calcination and sulfidation. The intermediate Ni hollow spheres, formed at different calcination temperatures (300°C and 400°C) under H/N atmosphere, can be easily transformed into NiS with similar morphology and mixed phases of NiS and NiS during the followed sulfidation process. The formation processes for the hollow structure of NiS are also discussed in this work. Particularly, the NiS prepared from Ni intermediate spheres at 300°C show a high specific capacity of 153.6mAhg at 0.5Ag at high mass loading due to its small crystal size, hierarchically porous structure and high electrical conductivity. A hybrid capacitor was assembled by using it as positive electrode and activated carbon as negative electrode to examine their practical applications in a full-cell configuration. The hybrid capacitor exhibited excellent comprehensive performances in 1.6V. The hybrid capacitor also showed good cycling stability, with 81.25% of the initial specific capacitance after 1000 cycles at 2Ag. Above results indicate the great potential of the NiS hollow spheres as a promising electrode material for supercapacitor applications.
分层镍硫化物（NiS）空心微球可以通过无模板法使用α-Ni(OH)微球作为前驱体，通过煅烧和硫化成功合成。在 H/N 气氛下于不同煅烧温度（300°C 和 400°C）下形成的中间 Ni 空心球可以在随后的硫化过程中很容易地转化为具有相似形态和 NiS 和 NiS 混合相的 NiS。本文还讨论了 NiS 空心结构的形成过程。特别是，在 300°C 下由 Ni 中间球体制备的 NiS 由于其小的晶体尺寸、分级多孔结构和高导电性，在高质量负载下 0.5Ag 时表现出 153.6mAhg 的高比容量。通过将其用作正极和活性炭用作负极组装混合电容器，以在全电池配置中检验其实际应用。在 1.6V 时，混合电容器表现出优异的综合性能。混合电容器还表现出良好的循环稳定性，在 2Ag 下 1000 次循环后初始比电容保持率为 81.25%。以上结果表明 NiS 空心球作为超级电容器应用的有前途的电极材料具有巨大的潜力。
