The close integration of an active layer with a current collector is of significance for the properties of supercapacitor electrodes. Herein, we propose a novel and feasible strategy where graphene hydrogels are implanted onto the carbon cloth on which polypyrrole is electrodeposited to obtain specially constructed electrodes. Particularly, the graphene oxide colloid drop-coated on the current collector undergoes a mild hydrothermal reduction to form a graphene hydrogel film implanted onto the carbon cloth. The integrated graphene/carbon cloth film with a porous graphene framework effectively contributes to the polypyrrole loading and endows the as-prepared electrode with enhanced electrochemical properties. The optimized electrode presents superb specific capacitances (522.3 F g^–1 at 0.7 A g^–1, 1462.5 mF cm^–2 at 2 mA cm^–2), with satisfactory rate capability, cycling lifetime, and bending performance. The corresponding device can achieve a desirable energy density (88.67 μWh cm^–2, 15.8 Wh kg^–1) and power density (14.65 mW cm^–2, 2.64 kW kg^–1). The design method reported in this paper could provide a new pathway toward constructing high-performing electrodes based on graphene materials.

中文翻译：

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石墨烯水凝胶植入到碳布上用于聚吡咯电沉积到高性能超级电容器电极

活性层与集流体的紧密结合对超级电容器电极的性能具有重要意义。在这里，我们提出了一种新颖且可行的策略，将石墨烯水凝胶植入到电沉积聚吡咯的碳布上，以获得特殊构造的电极。特别是，在集流体上滴涂的氧化石墨烯胶体经过温和的水热还原，形成植入碳布上的石墨烯水凝胶薄膜。具有多孔石墨烯骨架的集成石墨烯/碳布膜有效地促进了聚吡咯的负载，并赋予所制备的电极增强的电化学性能。优化后的电极呈现出极好的比电容（522.3 F g ^–1 at 0.7 A g ^–1, 1462.5 mF cm ^–2 at 2 mA cm ^–2 )，具有令人满意的倍率性能、循环寿命和弯曲性能。相应的器件可以实现理想的能量密度（88.67 μWh cm ^-2 , 15.8 Wh kg ^-1）和功率密度（14.65 mW cm ^-2 , 2.64 kW kg ^-1）。本文报道的设计方法可以为构建基于石墨烯材料的高性能电极提供新途径。