Supercapacitors have substantially altered the landscape of sophisticated energy storage devices with their exceptional power density along with prolonged cyclic stability. On the contrary, their energy density remains low, requiring research to compete with conventional battery storage devices. This study addresses the disparities between energy and power densities in energy storage technologies by exploring the integration of layered double hydroxides (LDH) and highly conductive materials to develop an innovative energy storage system. Four electrodes were fabricated via a hydrothermal process using NiCoCu LDH, Ag-citrate, PANI, and f-SWCNTs. The optimal electrode demonstrated exceptional electrochemical properties; at 0.5 A g⁻¹, it possessed specific capacitances of 807 F g⁻¹, twice as high as those of the pure sample. The constructed asymmetric supercapacitor device attained energy densities of 62.15 W h kg⁻¹ and 22.44 W h kg⁻¹, corresponding to power densities of 1275 W kg⁻¹ and 11 900 W kg⁻¹, respectively. Furthermore, it maintained 100% cyclic stability and a coulombic efficiency of 95% for 4000 charge–discharge cycles. The concept of a supercapacitor of the hybrid grade was reinforced by power law investigations, which unveiled b-values in the interval of 0.5 to 1. This research emphasizes the considerable potential of supercapacitor-grade NiCoCu LDH/Ag-citrate–PANI–f-SWCNTs nanocomposites for superior rate performance, robust cycle stability, and enhanced energy storage capacity.

中文翻译：

---

用柠檬酸银/聚苯胺/功能化单壁碳纳米管纳米复合材料定制镍钴铜层状双氢氧化物，用于超级电容器应用

超级电容器以其卓越的功率密度和长期的循环稳定性，极大地改变了复杂储能设备的面貌。相反，它们的能量密度仍然很低，需要进行研究才能与传统的电池存储设备竞争。本研究通过探索层状双氢氧化物（LDH）和高导电材料的集成来开发创新的储能系统，解决了储能技术中能量和功率密度之间的差异。使用 NiCoCu LDH、柠檬酸银、PANI 和 f-SWCNT通过水热工艺制造了四个电极。最佳电极表现出优异的电化学性能；在0.5 A g ^-1时，其比电容为807 F g ^-1，是纯样品的两倍。所构造的不对称超级电容器装置获得了62.15 W h kg ^-1和22.44 W h kg ^-1的能量密度，分别对应于1275 W kg ^-1和11 900 W kg ^-1的功率密度。此外，在 4000 次充放电循环中，它仍保持 100% 的循环稳定性和 95% 的库伦效率。幂律研究强化了混合级超级电容器的概念，幂律研究揭示了0.5 至 1 范围内的b值。这项研究强调了超级电容器级 NiCoCu LDH/Ag-柠檬酸盐-PANI-f-的巨大潜力。 SWCNT 纳米复合材料具有卓越的倍率性能、强大的循环稳定性和增强的能量存储容量。