Shao Meng, Li Jun, Li Jing, Yan Yanan, Li Ruoliu
School of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, China.
Nanomaterials (Basel). 2023 Jan 26;13(3):493. doi: 10.3390/nano13030493.
Honeycomb-like Ni(OH)/NiS/Ni foam (NF) was fabricated via a two-step hydrothermal process and subsequent alkalization. NiS with a honeycombed structure was in-situ synthesized on the NF surface by a hydrothermal process. MOF-derived Ni(OH) nanosheets were then successfully grown on the NiS/NF surface by a second hydrothermal process and alkaline treatment, and a large number of nanosheets were interconnected to form a typical honeycomb-like structure with a large specific surface area and porosity. As a binder-free electrode, the prepared honeycomb-like Ni(OH)/NiS/NF exhibited a high specific capacitance (2207 F·g at 1 A·g, 1929.7 F·g at 5 mV·s) and a remarkable rate capability and cycling stability, with 62.3% of the initial value (1 A·g) retained at 10 A·g and 90.4% of the initial value (first circle at 50 mV·s) retained after 5000 cycles. A hybrid supercapacitor (HSC) was assembled with Ni(OH)/NiS/NF as the positive electrode and activated carbon (AC) as the negative electrode and exhibited an outstanding energy density of 24.5 Wh·kg at the power density of 375 W·kg. These encouraging results render the electrode a potential candidate for energy storage.
通过两步水热法和后续碱化制备了蜂窝状的Ni(OH)/NiS/泡沫镍(NF)。通过水热法在NF表面原位合成了具有蜂窝状结构的NiS。然后通过第二次水热法和碱处理在NiS/NF表面成功生长出MOF衍生的Ni(OH)纳米片，大量纳米片相互连接形成具有大比表面积和孔隙率的典型蜂窝状结构。作为无粘结剂电极，制备的蜂窝状Ni(OH)/NiS/NF表现出高比电容(1 A·g时为2207 F·g，5 mV·s时为1929.7 F·g)以及显著的倍率性能和循环稳定性，在10 A·g时保留了初始值(1 A·g)的62.3%，在5000次循环后保留了初始值(50 mV·s时的第一圈)的90.4%。以Ni(OH)/NiS/NF作为正极、活性炭(AC)作为负极组装了混合超级电容器(HSC)，在功率密度为375 W·kg时表现出24.5 Wh·kg的出色能量密度。这些令人鼓舞的结果使该电极成为储能的潜在候选者。
