Enhancement of Capacitive Properties of Ce-Doped MnAl₂O₄ Electrode for High Performance Energy Storage Applications

The assessment of long-term stability is a crucial factor in the context of pseudocapacitive materials. However, doping has been found to be an effective method for enhancing the stability and capacitive properties of materials. This investigation objective was to determine the Ce doping effect on MnAl₂O₄ material for electrochemical properties. The outstanding electrochemical properties of Ce-doped MnAl₂O₄ material can be ascribed to its intrinsic characteristics, such as its crystal structure, morphology and high surface area. This enhancement can be attributed to the improved BET surface area (93.82 m² g⁻¹) and the presence of a mesoporous structure. Furthermore, specific capacitances (C_sp) of Ce-doped MnAl₂O₄ were found to be 1313.79 F g⁻¹, with energy density of 45.25 Wh kg⁻¹ and enhanced power density of 249 W kg⁻¹ at 1 A g⁻¹, indicating a promising electrochemical performance. Moreover, the Ce-doped MnAl₂O₄ electrode demonstrates exceptional cyclability, maintaining its performance over 5000 consecutive cycles, while also exhibit low impedance characteristics (R_ct = 0.15 Ω). The current investigation explores a potential novel method to produce distinctive Ce-doped MnAl₂O₄ electrode materials, which are promising candidates with long-term cycling stability and high energy density for application in supercapacitors (SC_s).