Developing graphene based supercapacitor electrodes with enhanced performance are critical to their future energy storage devices. In this study, well-controlled pyrene decorated graphene composites (PGCs) are synthesized via a facile solvothermal and subsequent activated route. It has demonstrated that the optimized PGCs electrode exhibits 310.7 F g^-1 at the current density of 1.5 A g^-1 and an excellent cycle stability with a capacitance retention of 99% after 15 000 cycles. Furthermore, an asymmetric supercapacitor fabricated with the PGC₃ (the mass ratio of pyrene to grapheme is 3:1) as the positive electrode and graphene as the negative electrode exhibit high power density, high energy density and long cycling life span. These results demonstrate that the pyrene decorated graphene electrode provides greatly enhanced electrochemical performance and shows promising application as anode for energy storage.

中文翻译：

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活化pyr修饰的石墨烯具有增强的电化学能量存储性能

开发具有增强性能的基于石墨烯的超级电容器电极对它们未来的储能设备至关重要。在这项研究中，受控的修饰的石墨烯复合材料（PGCs）是通过容易的溶剂热和随后的活化途径合成的。已经证明，优化的PGC电极在1.5 A g ^-1的电流密度下表现出310.7 F g ^-1的性能，并具有出色的循环稳定性，在15 000次循环后的电容保持率为99％。此外，用PGC ₃制造的不对称超级电容器（pyr与石墨烯的质量比为3：1）作为正电极，石墨烯作为负电极表现出高功率密度，高能量密度和长循环寿命。这些结果表明，decorated修饰的石墨烯电极提供了大大增强的电化学性能，并显示出有希望的应用作为储能阳极。