Layered double hydroxides are considered promising electrode materials for the preparation of high-energy-density supercapacitors owing to their suitable microstructure and significant electrochemical properties. In this study, honeycomb-like NiMn-layered double-hydroxide (NiMn-LDH) nanosheet arrays with numerous electron/ion channels, a large number of active sites, considerable redox reversibility, and significant electrical conductivity were synthesized by combining Co₂(OH)₂CO₃ nanoneedle arrays with NiMn-LDH nanosheet arrays and Ag nanoparticles on a carbon cloth (CC) substrate through a hydrothermal strategy (CC@Co₂CH/NM-LDH-Ag). The fabricated CC@Co₂CH/NM-LDH-Ag binder-free electrode exhibited a high specific capacitance of 10,976 mF cm⁻² (3092 F g⁻¹, 1391.4 C g⁻¹) at 2 mA cm⁻² (1 A g⁻¹), and a high capacitance retention of 93.2% after 10,000 cycles at a current density of 20 mA cm⁻². In addition, a solid-state asymmetric supercapacitor (ASC) device assembled using CC@Co₂CH/NM-LDH-Ag as the cathode possessed an ultrahigh energy density of 68.85 Wh kg⁻¹ at a power density of 722.6 W kg⁻¹, and two fabricated ASC units in series were able to power a multifunctional display for more than 30 min. Therefore, this study provides a new approach for the design and synthesis of high-performance flexible electrodes.

层状双氢氧化物因其合适的微观结构和显着的电化学性能而被认为是用于制备高能量密度超级电容器的有前景的电极材料。在本研究中，通过结合 Co ₂ (OH )通过水热策略 (CC@Co ₂ CH/NM-LDH-Ag)在碳布 (CC) 基板上具有 NiMn-LDH 纳米片阵列和 Ag 纳米颗粒的₂ CO _{3纳米针阵列。}制造的CC@Co ₂CH/NM-LDH-Ag 无粘合剂电极在 2 mA cm ^-2 (1 A g ^{-1 ) 下表现出 10,976 mF cm -2} (3092 F g ^-1 , 1391.4 C g ^-1 ) 的高比电容，并且在 20 mA cm ^-2的电流密度下循环 10,000 次后，电容保持率高达 93.2% 。_{此外，使用CC@Co 2} CH/NM-LDH-Ag作为阴极组装的固态非对称超级电容器（ASC）器件在722.6 W kg ^{-1的功率密度下具有68.85 Wh kg -1的超高能量密度。}，并且两个串联制造的 ASC 单元能够为多功能显示器供电超过 30 分钟。因此，本研究为高性能柔性电极的设计和合成提供了新的途径。