High-performance all-solid-state asymmetric supercapacitors based on sponge-like NiS/Ni3S2 hybrid nanosheets
High-performance all-solid-state asymmetric supercapacitors based on sponge-like NiS/Ni3S2 hybrid nanosheets
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DOI：
10.1016/j.mtener.2018.12.002
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发表时间：
2019-03
影响因子：
9.3
通讯作者：
Fangshuai Chen;Hui Wang;S. Ji;V. Linkov;Rongfang Wang
中科院分区：
文献类型：
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作者：
Fangshuai Chen;Hui Wang;S. Ji;V. Linkov;Rongfang Wang
采用低成本溶剂热法制备了结晶性良好的NiS/Ni 3S 2杂化纳米片作为非对称超级电容器的无粘结剂阴极材料。所获得的NiS/Ni 3S 2杂化材料的物理特性揭示了由相互连接的薄片组成的开放和海绵状结构。在三电极电池中，NiS/Ni 3S 2在电流密度为1 mA cm− 2时的容量为315 μAh cm− 2，当电流密度增加10倍时，容量保持率为87.6%。含有NiS/Ni 3S 2作为阴极和活性炭作为阳极的两电极非对称超级电容器在1.794 mW cm-2的功率密度下表现出0.289 mWh cm-2的高能量密度，当功率密度增加到12.825 mW cm-2时，其保持在0.242 mWh cm-2。本研究开发的新型电极材料在非对称超级电容器中具有良好的实际应用潜力。
NiS/Ni3S2hybrid nanosheets with good crystallinity as binder-free cathodes for asymmetric supercapacitors were fabricated via a low-cost single step solvothermal method. Physical characteristics of the obtained NiS/Ni3S2hybrids reveal open and sponge-like structure consisting of interconnected thin sheets. During electrochemical study in a three-electrode cell NiS/Ni3S2exhibited a high capacity of 315 μAh cm−2at a current density of 1 mA cm−2and retained 87.6% of the capacity when the current density increased 10 folds. A two electrode asymmetric supercapacitor containing NiS/Ni3S2as a cathode and activated carbon as an anode demonstrated a high energy density of 0.289 m Wh cm−2at a power density of 1.794 mW cm−2, which remained at 0.242 mWh cm−2when the power density increased to 12.825 mW cm−2. New electrode material developed in this study has good potential for practical applications in asymmetric supercapacitors.