Electrodeposition of NiMn-MOFs/carbon cloth for flexible all-solid-state supercapacitors electrode with ultra-long cycling stability

Metal-organic frameworks (MOFs) have significantly emerged as pioneering electrode materials in recent years for their exceptional properties, particularly in the field of supercapacitor applications. In this work, bimetallic NiMn-MOFs have been prepared onto carbon cloth (NiMn-MOFs/CC) via electrodeposition method. The obtained NiMn-MOFs are uniformly dispersed on the CC substrate, that can be served as an electrode material for flexible all-solid-state supercapacitors directly. The NiMn-MOFs/CC electrode indicates the greatest electrochemical performances when the molar ratio of Ni/Mn was 2:1. In a standard three-electrode system, the examined sample was subjected to a discharge current density of 15 mA cm−2, the area-specific capacitance of the NiMn-MOFs/CC electrode material was determined to be 2049.7 mF cm−2, with an impressive capacity retention of 87.38 % observed after 2000 cycles. Remarkably, the symmetric supercapacitor device constructed using NiMn-MOFs/CC, demonstrated outstanding flexibility, and remarkable long-term cycling stability. Even after 12,000 cycles, the initial specific capacitance of the device retained 81.9 %. Furthermore, the micro-device exhibited the capability to power a light-emitting diode (LED), demonstrating the practical energy storage applications of this electrode.