Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11027002 | Applied Surface Science | 2019 | 8 Pages |
Abstract
A facial solvothermal method is used to synthesize NiCo2S4 nanoparticles on carbon cloth (CC) to investigate the synergistic effect of transition metal sulfide and carbon substrates on the electrochemical performance in supercapacitors. The results demonstrate that the integrated binder-free NiCo2S4/CC electrode achieved a specific capacitance of 1379â¯Fâ¯gâ1 at 1â¯Aâ¯gâ1, and high rate capability of 82% when the current density increase to 50â¯Aâ¯gâ1, which is 13% and 35% higher than that of pristine NiCo2S4 counterpart. Detailed electrochemical kinetic analysis reveals that the proportion of surface capacitive effect of the hybrid electrode is higher than that of NiCo2S4 electrode at various scan rates due to the introduction of CC. CC substrate can provide a highway for electrolyte ions and electrons, facilitate the reaction kinetics, and shorten the diffusion distances for redox reaction, leading to improved performance of pseudocapacitive NiCo2S4. In addition, the as-fabricated asymmetric supercapacitors (ASC) based on NiCo2S4/CC//CNF electrodes demonstrate a high energy density of 41.28â¯Wâ¯hâ¯kgâ1 at a power density of 1564â¯Wâ¯kgâ1, along with long-term cycling performance and high rate stability.
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Authors
Xiaotong Xu, Xiaodong Tian, Xiao Li, Tao Yang, Yiting He, Kai Wang, Yan Song, Zhanjun Liu,