Strategies and preparation of innovative novel electrode materials are essential for the supercapacitor (SC) industry to enhance their electrochemical performance and cycling stability. Recently, binary transition metal selenides have attracted considerable interest for SC applications owing to their significant theoretical capacitance, easily tunable nanostructures, low cost, environmental friendliness, and high electrical conductivity. In this report, we synthesized molybdenum selenide (Mo₁₈Se₂₄) and magnesium molybdenum selenide (Mg₃Mo₁₈Se₂₄) (MoSe/MMSe) composite electrode materials on Ni foam (NF) via a facile hydrothermal technique. The MoSe/MMSe composite electrode exhibited superior areal capacity/specific capacity values of 1154.4 μA h cm⁻²/250.9 mA h g⁻¹ compared to individual electrodes. In addition, the effects of the single metal selenides MoSe and MgSe on the electrochemical properties were analyzed. Meanwhile, onion-derived activated carbon-coated NF (OAC/NF) was used as the negative electrode and exhibited high specific capacitance. Finally, a MoSe/MMSe/NF (positive (+))//OAC/NF (negative (−)) hybrid SC (HSC) cell was assembled. The HSC cell delivered maximum energy density of 28.5 W h kg⁻¹, maximum power density of 2353.8 W kg⁻¹, and long-term cycling stability of 74.3% after 45 000 cycles. Furthermore, the real-time practical applications of the HSC cell were tested by powering various electronic components.

中文翻译：

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用于高性能混合超级电容器的无粘合剂MoSe/MMSe复合材料和洋葱衍生活性炭电极材料

创新型新型电极材料的策略和制备对于超级电容器（SC）行业提高其电化学性能和循环稳定性至关重要。近年来，二元过渡金属硒化物因其显着的理论电容、易于调节的纳米结构、低成本、环境友好和高电导率而引起了超导应用的极大兴趣。在本报告中，我们通过简便的水热技术在泡沫镍（NF）上合成了硒化钼（Mo ₁₈ Se ₂₄）和硒化镁钼（Mg ₃ Mo ₁₈ Se ₂₄ ）（MoSe/MMSe）复合电极材料。与单个电极相比，MoSe/MMSe复合电极表现出优异的面积容量/比容量值为1154.4 μA h cm ^-2 /250.9 mA hg ^-1 。此外，还分析了单一金属硒化物MoSe和MgSe对电化学性能的影响。同时，洋葱源活性炭涂层NF（OAC/NF）用作负极，表现出高比电容。最后，组装了MoSe/MMSe/NF（阳性（+））//OAC/NF（阴性（−））混合SC（HSC）细胞。 HSC电池的最大能量密度为28.5 W h kg ^-1，最大功率密度为2353.8 W kg ^-1，45000次循环后的长期循环稳定性为74.3%。此外，通过为各种电子元件供电来测试HSC电池的实时实际应用。