Iron-iridium metal organic framework/nitrogen doped MXene/graphene quantum dots: A leading composite for electrolytic energy storage and hydrogen evolution reaction

MXene has recently been the subject of several studies on energy storage. Outstanding qualities that are essential to energy storage applications contain its conductivity, hydrophobicity, and especially significant surface redox reactivity. But while its amazing properties, a few problems seriously restrict its electrochemical efficiency, one of them being the formation of MXene sheets. The gaps between MXene sheets need to be filled with a suitable substance to prevent them from restacking. MOFs have also been thoroughly investigated for electrochemical applications. MOFs have a wide range of uses because of their high crystallinity, porous structure, and large surface area; nevertheless, their effectiveness as electrode materials is restricted by their reduced charging/discharging rate and specific capacity. In order to overcome these drawbacks, it is suggested that MOFs be combined with appropriate materials for improved performance. This work proposes a novel strategy: a composite of graphene quantum dots (GQDs), N-MXene, and iron‑iridium MOF (Ir@Fe-MOF). The limitation of MXene sheet restacking was achieved by reducing each of the ion/electron transportation paths and boosting the electroactive sites, resulting in a remarkable specific capacity in the composite, including MOFs. In a two-electrode assembly, the Ir@Fe-MOF/N-MXene/GQDs exhibited energy and power density of around 43.3 W h kg⁻¹ and 880 W kg⁻¹ respectively. A Coulombic efficiency of 93.06 % and 98.48 % of capacity was maintained by the Ir@Fe-MOF/N-MXene/GQDs/activated carbon (AC) material after 5000 cycles of alternative GCD measurements. The results of this work show that supercapattery applications can gain from the new electrode material Ir@Fe-MOF/N-MXene/GQDs.