Various Mn-doped ZnS controlled nanostructures were synthesized directly on the nickel foam to develop a binder-free, high-performance positive electrode for supercapacitors, where specific energy, specific power, and cycling stability are the crucial parameters. We achieved Mn-doped ZnS based different nanostructures, such as nanosheets, nanoflakes, and nanoneedles just by monitoring the reaction temperature. Among those three morphologies, the nanosheets showed the highest specific capacitance of 1905 F g⁻¹ at a current density of 1 A g⁻¹ and 93.1% capacity retention after 10,000 cycles in a three-electrode system. An asymmetric supercapacitor (ASC) device was assembled using Mn-doped ZnS nanosheets and activated carbon as a positive and negative electrode, respectively. The ASC device showed a high capacitance of 140 F g⁻¹ (210 C g⁻¹), delivered a high specific energy of 43.3 Wh kg⁻¹, and a high specific power of 6.8 kW kg⁻¹. The ASC device retained 93.3% with excellent coulombic efficiency of 95.7% after 8,000 cycles. Importantly, two serially connected ASC devices illuminated 52 red light-emitting diodes. This highlights the potential of the Mn-doped ZnS based ASC device for the next generation supercapacitors.

直接在泡沫镍上合成了各种Mn掺杂的ZnS控制的纳米结构，以开发出无粘合剂的高性能超级电容器用正极，其中比能，比功率和循环稳定性是关键参数。仅通过监测反应温度，我们就可以实现基于Mn掺杂的ZnS的不同纳米结构，例如纳米片，纳米薄片和纳米针。在这三种形态中，纳米片显示出1905 F G的最高比电容^-1在1A g的电流密度^-1在三电极系统中进行10,000次循环后，容量保持率为93.1％。使用锰掺杂的ZnS纳米片和活性炭分别作为正极和负极组装了不对称超级电容器（ASC）器件。该ASC装置显示出140 F g ^-1（210 C g ^-1）的高电容，传递了43.3 Wh kg ^-1的高比能量，以及6.8 kW kg ^-1的高比功率。在8,000次循环后，ASC设备保留了93.3％的电量，库仑效率高达95.7％。重要的是，两个串联的ASC设备点亮了52个红色发光二极管。这凸显了锰掺杂的基于ZnS的ASC器件在下一代超级电容器中的潜力。