Perovskite oxides, as a kind of functional materials, have been widely studied in recent years due to its unique physical, chemical, and electrical properties. Here, we successfully prepared perovskite-type LaCoO₃ (LCOs) nanomaterials via an improved sol-gel method followed by calcination, and investigated the influence of calcination temperature and time on the morphology, structure, and electrochemical properties of LaCoO₃ nanomaterials. Then, based on the optimal electrochemical performance of LCO-700-4 electrode sample, the newly synthesized nanocomposites of Sr-doping (LSCO-0.2) and rGO-compounding (rGO@LCO) through rational design exhibited a 1.45-fold and 2.03-fold enhancement in its specific capacitance (specific capacity). The rGO@LCO electrode with better electrochemical performances was further explored by assembling rGO@LCO//rGO asymmetric supercapacitor system (ASS) with aqueous electrolyte. The result showed that the ASS delivers a high energy density of 17.62 W h kg⁻¹ and an excellent cyclic stability with 94.48% of initial capacitance after 10,000 cycles, which are good electrochemical performances among aqueous electrolytes for green and new efficient energy storage devices.

钙钛矿氧化物作为一种功能材料，由于其独特的物理，化学和电学性质，近年来已得到广泛研究。在这里，我们成功地通过改进的溶胶-凝胶法接着煅烧成功地制备了钙钛矿型LaCoO ₃（LCOs ）纳米材料，并研究了煅烧温度和时间对LaCoO ₃的形态，结构和电化学性能的影响。纳米材料。然后，基于LCO-700-4电极样品的最佳电化学性能，通过合理设计，新合成的Sr掺杂（LSCO-0.2）和rGO化合物（rGO @ LCO）纳米复合材料表现出1.45倍和2.03倍其比电容（比容量）提高了两倍。通过将rGO @ LCO // rGO不对称超级电容器系统（ASS）与水性电解质组装在一起，进一步探索了具有更好电化学性能的rGO @ LCO电极。结果表明，ASS在10,000次循环后具有17.62 W h kg ^-1的高能量密度和优异的循环稳定性，其初始电容为94.48％，在绿色和新型高效储能装置的水性电解质中具有良好的电化学性能。