Abstract NiMn layered double hydroxide (NiMn LDH) and NiMn LDH/reduced graphene oxide (rGO) with flower-like 3D composite were synthesized by a simple solvothermal process. The electrochemical properties of NiMn LDH/rGO composite with different contents of rGO were studied, resulting in enhanced capacitance due to the incorporation of rGO compared with pristine NiMn LDH. The NiMn LDH/rGO composite containing 4.46 wt% rGO (LDH/rGO-4) exhibited the highest specific capacitance of 1500 F g −1 at 1 A g −1 with an excellent cyclic stability of 90.5% over 5000 charging and discharging cycles at 20 A g −1 . The asymmetric supercapacitor assembled with LDH/rGO-4 and rGO electrodes exhibited a high specific capacitance of 82.5 F g −1 at 0.5 A g −1 and superior energy density of 29.3 Wh kg −1 . These results illustrate that the LDH/rGO-4 composite is a promising material for supercapacitor applications.

中文翻译：

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用于高性能不对称超级电容器的花状NiMn层状双氢氧化物/还原氧化石墨烯微球复合材料的简便制备

摘要 通过简单的溶剂热法合成了具有花状 3D 复合材料的 NiMn 层状双氢氧化物 (NiMn LDH) 和 NiMn LDH/还原氧化石墨烯 (rGO)。研究了具有不同 rGO 含量的 NiMn LDH/rGO 复合材料的电化学性能，与原始 NiMn LDH 相比，由于 rGO 的掺入导致电容增强。含有 4.46 wt% rGO (LDH/rGO-4) 的 NiMn LDH/rGO 复合材料在 1 A g -1 下表现出最高的 1500 F g -1 比电容，在 5000 次充放电循环中具有 90.5% 的优异循环稳定性。 20 A g -1 。组装有LDH/rGO-4和rGO电极的非对称超级电容器在0.5 A g -1 时表现出82.5 F g -1 的高比电容和29.3 Wh kg -1 的优异能量密度。