Metal-organic frameworks (MOFs) possessmultifunctional characteristicssuch as tuneable pore structure and high specific surface area and are being designed with great interest to enhance the electrochemical properties of current energy storage devices. In this aspect, MOFs-derived layered double hydroxides (LDHs) are important candidates for advanced supercapacitors due to their high electrochemical activity and electric conductivity. Herein, we report synthesis of Cobalt Manganese layered double hydroxides (CoMn LDH) utilising Co MOF as a precursor via ion exchange method, while optimising the dosage of Mn to achieve the best possible structural outcome. The unique structure of CoMn LDH expressed high electrochemical parameters possessing specific capacitance of 1305F/g at 1 A/g. Afterwards, an asymmetric supercapacitor device was fabricated employing CoMn LDH as cathode and coffee grounds derived rGO (reduced graphene oxide) as anode. The as-prepared asymmetric supercapacitor device demonstrated a maximum working potential window of 1.2 V with energy and power density of 23.8 Wh/kg and 0.30 kW/Kg respectively. The device also exhibits superiorcoulombic efficiency and capacitance retention of 71.11 % and 82.7 % respectively over 3010 charge–discharge cycles that represents an effectiveapproach towards sustainable and effectiveenergy storage devices. In a nutshell, our study centred on adjusting composition, engineering structures, and assembling devices.

中文翻译：

---

无粘合剂钴锰层状双氢氧化物阳极与生物衍生的 rGO 阴极结合，用于可持续、高性能的不对称超级电容器

金属有机框架（MOF）具有多功能特性，例如可调节的孔结构和高比表面积，人们对其进行了极大的设计，以提高当前储能装置的电化学性能。在这方面，MOF 衍生的层状双氢氧化物（LDH）由于其高电化学活性和导电性而成为先进超级电容器的重要候选者。在此，我们报道了利用Co MOF作为前体通过离子交换方法合成钴锰层状双氢氧化物（CoMn LDH），同时优化Mn的用量以获得最佳的结构结果。 CoMn LDH 的独特结构表现出高电化学参数，在 1 A/g 下具有 1305F/g 的比电容。随后，使用 CoMn LDH 作为阴极和咖啡渣衍生的 rGO（还原氧化石墨烯）作为阳极制造了不对称超级电容器装置。所制备的非对称超级电容器装置的最大工作电位窗口为1.2 V，能量和功率密度分别为23.8 Wh/kg和0.30 kW/Kg。该器件在 3010 个充放电循环中还表现出优异的库仑效率和电容保持率，分别为 71.11% 和 82.7%，这代表了实现可持续和高效储能器件的有效方法。简而言之，我们的研究集中在调整成分、工程结构和组装装置上。