Crystalline Mn₃O₄nanoparticles were prepared by olive leaf extract (OLE)-mediated wet chemistry under mild conditions. These nanoparticles are used as supported active material on a carbon working electrode in a set of room-temperature charge/discharge assays that allowed evidencing a clear pseudo-capacitance behavior with a high specific capacitance value (583.7 F g⁻¹). The engineered electrode presented a good cycling stability: after 2000 cycles at a current density of 4 A g⁻¹, keeping 87% of the initial value. At this current density, the measured specific energy (55.60 Wh.kg⁻¹) and power (5.12 kW kg⁻¹) were found to be quite competitive with other reports in the literature, highlighting the potential of the produced particles as supercapacitor electrode materials.

在温和条件下，通过橄榄叶提取物（OLE）介导的湿化学制备了Mn ₃ O ₄纳米晶。这些纳米颗粒在一组室温充电/放电试验中用作碳工作电极上的负载活性材料，该试验可以证明具有高比电容值（583.7 F g ^-1）的清晰伪电容行为。工程电极表现出良好的循环稳定性：2000次循环后，电流密度为4 A g ^-1，保持初始值的87％。在此电流密度下，测得的比能（55.60 Wh.kg ^-1）和功率（5.12 kW kg ^-1）被发现与文献中的其他报告相比具有相当的竞争力，突出了所产生的颗粒作为超级电容器电极材料的潜力。