‘‘Study of the electrochemical properties of polyaniline-integrated chromium oxide composite with metal–organic framework electrode (Cr₂O₃/Sn-MOF (PANI)) for asymmetric supercapacitors and hydrogen production applications’’

This study investigates the potential of Cr₂O₃/Sn-MOF (PANI) composites for next-generation energy storage systems. The unique combination of Cr₂O₃ and Sn-MOF (PANI) enhances hydrophobicity, charge transport, and surface redox activity, making it an attractive material for energy storage. However, challenges such as the reassembly of individual components can reduce electrochemical efficiency. To overcome this, we integrated Cr₂O₃ and Sn-MOF (PANI), filling gaps between layers and enhancing electroactive sites. Through this innovative composite synthesis, we improved ion/electron transport pathways and prevented material restacking. The Cr₂O₃/Sn-MOF (PANI) electrodes exhibited specific capacities of 794 C/g in a three-electrode assembly. The Cr₂O₃/Sn-MOF (PANI)//AC device achieved 68.9 Wh/kg energy density at 970 W/kg power density. The composite Cr₂O₃/Sn-MOF (PANI) provide an overpotential of 73.7 mV and tafel slope of 55.7 mV/dec in HER applications. This study highlights the potential of Cr₂O₃/Sn-MOF (PANI) electrode for future energy storage and electrocatalytic applications.

(a) Represents the CV and (b) represents the GCD study for Cr2O3/Sn-MOF(PANI) composite