Hybrid Design Using Metal–Organic Framework MIL-101(Cr) with Melaminium Bis (Hydrogenoxalate) (MOX) for Hybrid Supercapacitors and Hydrogen Evolution Reactions

Advancements in metal–organic frameworks MIL-101(Cr) and melaminium bis (hydrogenoxalate) (MOX) are attracting attention for their potential applications and electrochemical performance. They thoroughly examine the domains of electrochemical water splitting and hybrid energy storage. This work aims to investigate the electrochemical properties of MIL-101(Cr), MOX, and their composites MIL-101(Cr)/MOX for the hydrogen evolution reaction (HER) in electrochemical water splitting and potential for integration into hybrid energy storage devices. MIL-101(Cr) nanocomposite exhibits well-distributed and stable MOX nanoparticles due to the formation of tiny channels and strong chemical bonds. The MIL-101(Cr)/MOX composite electrode demonstrated remarkable hydrogen evaluation reaction (HER) activity, exhibiting a low overpotential of 130 mV and a high Tafel slope of 33.34 mV/dec. These results suggest that the MIL-101(Cr)/MOX material is a promising candidate for efficient and cost-effective HER electrocatalysis. This electrode was then used to fabricate a hybrid supercapattery device with activated carbon (AC) for energy storage. In this study, a fabricated novel hybrid energy storage device achieves an impressive combination of high energy density (88 Wh/kg) and exceptional power density (1240 W/kg), surpassing conventional supercapacitors. In addition, the theoretical approach was employed to offer more information regarding the experimental results. This study reveals a breakthrough in electrode design. The remarkable reactivity paves the way for substantial advancements in energy storage and electrochemical water-splitting technologies.