The highly performed electrochemical energy storage systems have been required to rectify the reduction of sustainable energies in recent times. Herein, we investigate a facile hydrothermal synthesis of binary cerium oxide-samarium oxide nanocomposites (CeO₂-Sm₂O₃ NCs) and study their electrochemical performance of Cyclic Voltammetry (CV), Galvanostatic Charge-Discharge (GCD), and Electrochemical Impedance Spectroscopy (EIS) analysis. The structure, chemical bonds, and morphology of the synthesized nanocomposites have been analyzed by XRD, FTIR, SEM with EDX, and HR-TEM with SAED pattern. From the CV study, the binary CeO₂-Sm₂O₃ NCs reveal 397.50 C/g of higher specific capacity compared to individual CeO₂ (72.85 C/g) and Sm₂O₃ (122.80 C/g). The Trasatti and Dunn's method manifests the outer (C_o), total (C_T), and inner (C_i) capacities of 165.05, 531.91, and 366.86 C/g for the prepared binary CeO₂-Sm₂O₃ NCs. The stability of CeO₂-Sm₂O₃ NCs delivers 97.84% excellent retention and 101.21% coulombic efficiency over 3000 cycles. Furthermore, the hybrid supercapacitor (CeO₂-Sm₂O₃//AC) device has been developed and their electrochemical behaviors were analyzed in two electrode setup. The constructed device manifests a higher specific capacity of 139.97 C/g at 0.5 A/g current density, better retention of 86.92% and coulombic efficiency of 100.02% at 5 A/g over 3000 cycles, the higher energy density of 32.85 Wh/kg, and a higher power density of 4223.91 W/kg respectively.

近年来，需要高性能的电化学储能系统来纠正可持续能源的减少。在此，我们研究了二元氧化铈-氧化钐纳米复合材料（CeO ₂ -Sm ₂ O ₃ NC）的简便水热合成，并研究了它们的循环伏安法（CV）、恒电流充放电（GCD）和电化学阻抗谱的电化学性能（EIS）分析。合成的纳米复合材料的结构、化学键和形态通过 XRD、FTIR、SEM（EDX）和 HR-TEM（SAED 模式）进行了分析。根据CV研究，二元CeO ₂ -Sm ₂ O _{3与单独的CeO 2} (72.85 C/g) 和Sm ₂ O ₃ (122.80 C/g)相比，NCs 显示出更高的比容量397.50 C/g 。Trasatti和Dunn的方法显示所制备的二元CeO ₂ -Sm ₂ O ₃ NCs的外容量(C _o )、总容量(C _T )和内容量(C _{i )分别为165.05、531.91和366.86 C/g。CeO 2} -Sm ₂ O ₃ NC的稳定性在 3000 次循环中可提供 97.84% 的优异保留率和 101.21% 的库仑效率。此外，混合超级电容器（CeO ₂ -Sm ₂ O ₃//AC）装置已经开发出来，并在两个电极设置中分析了它们的电化学行为。所构建的器件在0.5 A/g电流密度下表现出较高的比容量为139.97 C/g，在5 A/g电流密度下经过3000次循环后的保留率为86.92%，库仑效率为100.02%，能量密度较高为32.85 Wh/kg ，以及更高的功率密度，分别为 4223.91 W/kg。