Ce-Doping Strategy for Enhanced NiMn Hydrotalcite Electrodes in Supercapacitor Applications

To enhance the electrochemical performance of NiMn layered double hydroxides (LDH), this study explores the Ce-doped NiMn-LDH (CeNiMn-LDH) as a cathode material for supercapacitors. In the CeNiMn-LDH structure, partial substitution of Ni/Mn ions by Ce increases the number of active sites, facilitates electron transfer, and improves current density, leading to a significant enhancement in the electrochemical properties compared with NiMn-LDH. Experimental results show that the 0.3CeNiMn-LDH electrode delivers excellent electrochemical performance, achieving a specific capacitance of 1928.16 F/g at a current density of 1 A/g. Furthermore, an assembled CeNiMn-LDH//AC asymmetric supercapacitor exhibits an energy density of 36.36 Wh/kg and a power density of 850 W/kg at 1 A/g. Therefore, the strategy of employing CeNiMn-LDH offers an effective technical approach for improving the electrochemical performance of supercapacitor cathode materials, demonstrating considerable potential for practical applications.