Flexible supercapacitors using graphene have been intensively investigated due to their potential applications for wearable and smart devices. In order to avoid stacking between graphene layers, spacers such as carbon fibers and metal oxide particles are often introduced. Such composites enhance effectively the specific surface area of the electrodes and eventually supercapacitor performance. In present work, the graphene/g-C3N4 composite is fabricated and further employed as the supercapacitor electrode. The atomic interaction between C and N of g-C3N4 and O of graphene oxide during the post-reduction in graphene oxide is found to affect device performance. The devices fabricated using the graphene/g-C3N4 composite electrode exhibit a specific area capacitance of 1500 mF cm−2, and 95% of initial capacitance after 5000 cycles and a maximum energy density of 0.075 mWh cm−2. These all-solid-state flexible supercapacitors are thus promising for miniaturized electronics.

中文翻译：

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使用石墨烯/g-C3N4 复合电容器电极的全固态柔性超级电容器

使用石墨烯的柔性超级电容器因其在可穿戴和智能设备中的潜在应用而受到广泛研究。为了避免石墨烯层之间的堆叠，通常会引入碳纤维和金属氧化物颗粒等间隔物。这种复合材料有效地提高了电极的比表面积，并最终提高了超级电容器的性能。在目前的工作中，石墨烯/g-C3N4 复合材料被制造并进一步用作超级电容器电极。发现在氧化石墨烯的后还原过程中，g-C3N4 的 C 和 N 与氧化石墨烯的 O 之间的原子相互作用会影响器件性能。使用石墨烯/g-C3N4 复合电极制造的器件具有 1500 mF cm-2 的比面积电容，5000 次循环后的初始电容为 95%，最大能量密度为 0.075 mWh cm-2。因此，这些全固态柔性超级电容器有望用于小型化电子产品。