Yan Hailong, Zhu Kejia, Liu Xu, Wang Yinghui, Wang Yangbo, Zhang Deyang, Lu Yang, Peng Tao, Liu Yunxin, Luo Yongsong
School of Physics and Electronic Engineering, Xinyang Normal University Xinyang 464000 P. R. China
Key Laboratory of Microelectronics and Energy of Henan Province, Xinyang Normal University Xinyang 464000 P. R. China.
RSC Adv. 2020 Feb 28;10(15):8760-8765. doi: 10.1039/c9ra09486e. eCollection 2020 Feb 27.
Low energy density of supercapacitors is one of the major downsides for their practical applications. Here, a simple hydrothermal method was developed to synthesize NiS nanosheets on Ni foam. NiS nanosheets with a rough surface promise large electroactive surface area for energy storage, and show an ultra-high capacitance of 2587 F g at a scan rate of 0.2 A g (corresponding to the discharge time of 5563 s). The NiS nanosheets also present an outstanding cycling stability of 95.8% after 4000 cycles. As a positive electrode material for hybrid supercapacitors (HSC), NiS nanostructures provide a broad voltage window of 1.7 V. Our device also shows a high energy density of 38 W h kg at a power density of 1.5 kW kg.
超级电容器的低能量密度是其实际应用的主要缺点之一。在此，开发了一种简单的水热法在泡沫镍上合成硫化镍纳米片。具有粗糙表面的硫化镍纳米片有望为能量存储提供大的电活性表面积，并在0.2 A g的扫描速率下显示出2587 F g的超高电容（对应于5563 s的放电时间）。硫化镍纳米片在4000次循环后还具有95.8%的出色循环稳定性。作为混合超级电容器（HSC）的正极材料，硫化镍纳米结构提供了1.7 V的宽电压窗口。我们的器件在1.5 kW kg的功率密度下还显示出38 W h kg的高能量密度。
