Supercapacitor energy storage devices recently garnered considerable attention due to their cost-effectiveness, eco-friendly nature, high power density, moderate energy density, and long-term cycling stability. Such figures of merit render supercapacitors unique energy sources to power portable electronic devices. Among various energy storage materials, graphene-related materials have established themselves as ideal electrodes for the development of elite supercapacitors because of their excellent electrical conductivity, high surface area, outstanding mechanical properties combined with the possibility to tailor various physical and chemical properties via chemical functionalization. Increasing the surface area is a powerful strategy to improve the performance of supercapacitors. Here, modified polyhedral oligosilsesquioxane (POSS) is used to improve the electrochemical performance of reduced graphene oxide (rGO) through the enhancement of porosity and the extension of interlayer space between the sheets allowing efficient electrolyte transport. rGO–POSS hybrids exhibited a high specific capacitance of 174 F g⁻¹, power density reaching 2.25 W cm⁻³, and high energy density of 41.4 mW h cm⁻³ endowed by the introduction of POSS spacers. Moreover, these electrode materials display excellent durability reaching >98% retention after 5000 cycles.

中文翻译：

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还原氧化石墨烯-倍半硅氧烷杂化物作为新型超级电容器电极。

超级电容器储能装置由于其成本效益高、环境友好、高功率密度、中等能量密度和长期循环稳定性等优点，近年来受到广泛关注。此类品质因数使超级电容器成为为便携式电子设备供电的独特能源。在各种储能材料中，石墨烯相关材料凭借其出色的导电性、高表面积、出色的机械性能以及通过调整各种物理和化学性能的可能性，已成为精英超级电容器开发的理想电极。化学功能化。增加表面积是提高超级电容器性能的有力策略。在这里，改性多面体低聚倍半硅氧烷 (POSS) 用于通过提高孔隙率和扩展片材之间的层间空间来提高还原氧化石墨烯 (rGO) 的电化学性能，从而实现高效的电解质传输。rGO-POSS 杂化物表现出 174 F g ⁻¹的高比电容、达到 2.25 W cm ⁻³的功率密度和 41.4 mW h cm ⁻³的高能量密度，这是由 POSS 间隔物的引入赋予的。此外，这些电极材料表现出出色的耐久性，在 5000 次循环后仍能保持 >98%。