超级电容器
材料科学
硫化
镍
金属有机骨架
钴
堆积
化学工程
电化学
纳米技术
电极
复合数
比表面积
复合材料
化学
催化作用
冶金
有机化学
物理化学
吸附
硫黄
工程类
作者
Qingli Sui,Jing Li,Cuili Xiang,Fen Xu,Jian Zhang,Lixian Sun,Yongjin Zou
标识
DOI:10.1016/j.est.2022.105525
摘要
Metal-organic frameworks (MOFs) are commonly used for template and precursor for supercapacitor electrodes. MOFs are interesting due to excellent specific surface areas and pore structures. Two-dimensional nanosheets suffer from the disadvantages of random growth and easy agglomeration, which significantly limit their applications. In this study, NiCo sulfides with unique morphology were designed using a simple in situ sulfidation method, with Ni-MOF used as the substrate material. The unique three-dimensional structures can offer many reaction sites to guarantee electron transfer. The samples obtained (Ni7S6@NiCo2S4) exhibited good electrochemical performance. The composite electrode material had a capacity value of 1636 F g−1 in a 3 M KOH. In addition, devices comprising with activated carbon had a specific energy of 53 Wh kg−1 and a specific power of 810 W kg−1. The asymmetric supercapacitor (ASC) exhibited outstanding cycling of 87 % after 5000 cycles. This study demonstrates a flexible method for activating MOFs to enhance the capabilities of supercapacitor materials. Thus, this method maintains a well-defined stacking structure of nanosheets while enriching the active sites, it is promising for the applications of MOF derivatives.
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