The exploration of electrode functional materials for supercapacitors may bring a revolution to energy storage devices to boost the portable industry. Herein, lanthanum sulfide nanorods and reduced graphene oxide (rGO)–templated lanthanum sulfide nanorods have been synthesized using the hydrothermal process. Structural, morphological, and compositional analyses were conducted using X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The specific surface area has been measured using the Brunauer–Emmett–Teller technique. Individual lanthanum sulfide and rGO-templated lanthanum sulfide showed the morphology of nanorods. Cyclic voltammetry tests predicted the pseudocapacitive nature of the lanthanum sulfides for supercapacitor applications. The rGO effectively improved the electrochemical characteristics of the lanthanum sulfide, which might be due to the facilitation of charge carriers through nanorods, as the rGO-templated lanthanum sulfide nanorod showed a specific capacitance of 75.17 F/g at a scan rate of 30 mV/s evidenced by cyclic voltammetry (CV) curves. The rGO significantly increased the discharge time from 60 to 188 s, specific capacitance from 20.32 to 34.12 F/g, and energy density from 572 to 1185 mW/kg compared to individual lanthanum sulfide nanorods as seen by the galvanostatic charge/discharge profile. The rGO-templated lanthanum sulfide nanorods showed a power density of 255.20 W/kg at a high current density of 0.2 A/g and a specific capacitance retention up to 91.60% for 2000 cycles at scan rate of 20 mV/s. Symmetric cell exhibited the specific capacitance of 94.45 F/g, energy density of 6.43 Wh/kg at the current density of 0.05 A/g, and power density of 351.25 W/kg at the current density of 0.2 A/g. The test results indicate that the use of rGO is effective in improving the electrochemical characteristics of lanthanum sulfide nanorods for supercapacitor applications.

超级电容器电极功能材料的探索可能会给储能设备带来一场革命，推动便携式产业的发展。在此，使用水热法合成了硫化镧纳米棒和还原氧化石墨烯（rGO）模板化的硫化镧纳米棒。使用 X 射线衍射、扫描电子显微镜和能量色散 X 射线光谱进行结构、形态和成分分析。比表面积已使用 Brunauer-Emmett-Teller 技术测量。单独的硫化镧和 rGO 模板化的硫化镧显示出纳米棒的形态。循环伏安测试预测了硫化镧在超级电容器应用中的赝电容性质。rGO 有效地改善了硫化镧的电化学特性，这可能是由于电荷载流子通过纳米棒的促进作用，因为 rGO 模板化的硫化镧纳米棒在 30 mV/ s 由循环伏安法 (CV) 曲线证明。与单个硫化镧纳米棒相比，rGO 的放电时间从 60 秒显着增加到 188 秒，比电容从 20.32 到 34.12 F/g，能量密度从 572 到 1185 mW/kg，如恒电流充电/放电曲线所示。rGO 模板化的硫化镧纳米棒在 0.2 A/g 的高电流密度下的功率密度为 255.20 W/kg，在 20 mV/s 的扫描速率下，在 2000 次循环中的比电容保持率高达 91.60%。对称电池的比电容为 94。45 F/g，电流密度为 0.05 A/g 时的能量密度为 6.43 Wh/kg，电流密度为 0.2 A/g 时的功率密度为 351.25 W/kg。测试结果表明，使用 rGO 可有效改善用于超级电容器应用的硫化镧纳米棒的电化学特性。