Facile Synthesis of <scp> Bi ₂ O ₃ </scp> @ <scp> Er ₂ O ₃ </scp> / <scp>MXenes</scp> Electrodes for Supercapacitor Applications

ABSTRACT The research work demonstrated a simple hydrothermal technique for fabricating viable (2D/3D) dimensional Bi 2 O 3 @Er 2 O 3 /MXenes composite electrodes with strong pseudocapacitive properties. These composite electrodes were created utilizing active MXenes and commercial Bismuth/Erbium oxides. Various diffractive, spectroscopic, and microscopic techniques were employed to characterize the composite electrodes, which were also investigated electrochemically for potential application as supercapacitor electrodes. However, maximum specific capacitances of 1105, 872, and 1335 Fg −1 were obtained through electrochemical examination engaging a scan rate of 1.0 mVs −1 for Bi 2 O 3 /MXenes (BM), Er 2 O 3 /MXenes (EM), and Bi 2 O 3 @Er 2 O 3 /MXenes (BEM) electrodes, respectively. Similarly, engaging GCD at 0.5 Ag −1 current density, an optimum specific capacitance of 1280, 998, and 1572 Fg −1 . According to the investigation, these electrodes' electrochemical characteristics were outstanding, which may have been influenced by the inclusion of MXenes. It is possible to employ BM, EM, and BEM electrodes as supercapacitor electrodes because of their exceptional performance and efficiency. It is found that the BEM electrode retains 75.93% of the electrode's original specific capacitance (SC) worth subsequent to 10 000 complete cycles, indicating outstanding cyclic firmness using 0.5 Ag −1 current density.