Indirect Nanoconstruction Morphology of Ni3S2 Electrodes Renovates the Performance for Electrochemical Energy Storage
Indirect Nanoconstruction Morphology of Ni3S2 Electrodes Renovates the Performance for Electrochemical Energy Storage
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DOI：
10.1021/acsaem.8b01310
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发表时间：
2018-10
影响因子：
6.4
通讯作者：
Donggun Kim;Padmanathan Karthick Kannan;S. Mateti;C. Chung
中科院分区：
文献类型：
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作者：
Donggun Kim;Padmanathan Karthick Kannan;S. Mateti;C. Chung
具有基于过渡金属硫化物的正电极的不对称超级电容器显示出比碳基超级电容器高的比电容和更高的能量密度，碳基超级电容器由于电活性材料的导电性差和对法拉第氧化还原反应的高度依赖而具有低的电化学稳定性。在这项工作中，不利的氧化还原反应动力学的硫化镍（Ni 3S 2）是通过制造一个高度多孔的Ni集流体补偿。所制备的Ni 3S 2电极在10 mA cm-2的电流密度下显示出786.5 C g-1的高比容量，由于其由多孔Ni框架支撑的连续电子传导通道，具有高倍率性能。使用Ni 3S 2作为正极和活性炭（AC）作为负极制造非对称全电池超级电容器，在833 W kg-1的功率密度下显示出39.7 W h kg-1的高能量密度。经6000次循环后，仍保持93.9%的比电容，表明该材料具有优良的电化学性能。
Asymmetric supercapacitors with positive electrodes based on transition metal sulfides show high specific capacitance with higher energy density than that of carbon-based supercapacitors, which suffer from low electrochemical stability because of poor conductivity of the electroactive materials and high reliance on faradaic redox reactions. In this work, the unfavorable redox reaction kinetics of nickel sulfides (Ni3S2) is compensated by fabricating a highly porous Ni current collector. The as-prepared Ni3S2 electrodes show a high specific capacity of 786.5 C g–1 at a current density of 10 mA cm–2 with high rate capability due to their continuous electronic conduction channels supported by the porous Ni frame. An asymmetric full-cell supercapacitor is fabricated using Ni3S2 as a positive electrode and activated carbon (AC) as a negative electrode, showing a high energy density of 39.7 W h kg–1 at a power density of 833 W kg–1. Moreover, a 93.9% specific capacitance is retained even after 6000 cycles, indi...