Molybdenene for Energy Storage Applications

Abstract

Molybdenene, a full‐fledged metallene has been sensational among all Xenes. Apart from metallicity with excellent carrier concentration, it is anticorrosive, rendering it a superioor electrode material for electrochemical energy storage. As evident from atomic force microscopy, microwave‐synthesized molybdenene constitutes of monolayers (each layer ≈0.4 nm) and lateral dimensions extended to millimeters. Cris‐cross intertwinned crystals with close to square (0.20, 0.21 nm) lattice with fourfold symmetry were observed in electron imaging. Characteristic metallic signal (Mo–Mo vibration) in Raman peak at ≈405 cm−1 proves chemical phase purity. The electrochemical performance of synthesized molybdenene sheets is evaluated for supercapacitor applications in a 2 m KOH electrolyte. The as‐synthesized molybdenene demonstrates a specific capacitance of 327.78 F g−1 at a scan rate of 10 mV s−1 and 118.6 F g−1 at a current rate of 0.50 A g−1 in a three‐electrode configuration, with a capacitance retention of 81.0% over 5000 cycles. Furthermore, an asymmetric supercapacitor employing molybdenene as the positive electrode and activated carbon as the negative electrode exhibits an energy density of 15.94 Wh kg−1 at a power density of 399.72 W kg−1. These findings highlight molybdenene as a promising candidate for high‐performance electrochemical energy storage devices.