Jia Wei, He Qi, Guo Zhiqiang, Wu Xiang
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, P. R. China.
Dalton Trans. 2025 Sep 9;54(35):13356-13364. doi: 10.1039/d5dt01540e.
The morphology of the electrode materials seriously affect their structure and performances. The application of two-dimensional Ni(OH) nanomaterials in supercapacitors is hindered by their low conductivity and limited active sites. Herein, we synthesized Ni(OH)@NiS composites a two-step hydrothermal route. It increased the specific surface area and improved ion-transport rate of the composites. The Ni(OH)@NiS-2 sample delivered a specific capacitance of 1778 F g at 1 A g and good cycle stability (88% capacity retention at 2 A g after 10 000 cycles). Furthermore, an asymmetric supercapacitor (ASC) fabricated using the Ni(OH)@NiS-2 composite electrode achieved an energy density of 110.25 Wh kg at 2700 W kg. Moreover, the device demonstrated stable cycling capability at extreme temperatures (-10 °C and -20 °C).
电极材料的形态严重影响其结构和性能。二维氢氧化镍纳米材料在超级电容器中的应用受到其低导电性和有限活性位点的阻碍。在此，我们通过两步水热法合成了氢氧化镍@硫化镍复合材料。这增加了复合材料的比表面积并提高了离子传输速率。氢氧化镍@硫化镍-2样品在1 A g时的比电容为1778 F g，具有良好的循环稳定性（在2 A g下循环10000次后容量保持率为88%）。此外，使用氢氧化镍@硫化镍-2复合电极制备的不对称超级电容器（ASC）在2700 W kg时的能量密度为110.25 Wh kg。此外，该器件在极端温度（-10°C和-20°C）下表现出稳定的循环能力。
