The flexible supercapacitors have attracted tremendous attentions, but challenges still remain in seeking suitable electrode materials to enhance the energy density and other aspects. To this end, a unique Polypyrrole (PPy)-reduced graphene oxide (rGO) Janus-faced film is prepared through a facile and scalable method consisting of the deposition of graphene film on the surface of copper foil via a Cu||GO electrochemical cell followed by the self-assembly of PPy at the heterogeneous interface. Such a distinctive structure, in which the PPy layer acts as the source of high pseudo-capacitance, while the graphene layer is employed as the “high way” for rapid electron transport and as well as the strong π-π coupling effect between graphene and polymer nanosheets, endows the resultant electrode ultra-high specific capacitances (1380 mF cm^-2 at 1 mA cm^-2) and excellent rate capability (65.1% capacitance retention with the current density increases to 20 mA cm^-2). Furthermore, the assembled PPy-rGO//PPy-rGO symmetric supercapacitors deliver a maximum energy density of 31.95 Wh L^-1, remarkable cyclic stability (89.7% capacitance retention after 10000 cycles) and superior mechanical property (82% capacitance retention after 8000 cycles under different bending conditions).

柔性超级电容器引起了极大的关注，但是在寻找合适的电极材料以提高能量密度和其他方面仍然存在挑战。为此，通过一种简便而可扩展的方法，制备了一种独特的聚吡咯（PPy）还原的氧化石墨烯（rGO）Janus面膜，该方法包括通过Cu || GO电化学电池将石墨烯膜沉积在铜箔表面上然后是异质界面上的PPy自组装。这种独特的结构，其中PPy层充当高伪电容的来源，而石墨烯层被用作“快速通道”，以实现快速的电子传输以及石墨烯与石墨烯之间的强π-π耦合效应。聚合物纳米片，赋予所得电极超高比电容（1380 mF cm^-2在1mA厘米^-2）和优异的速率能力（用电流密度的增加至20 mA厘米65.1％容量保持^-2）。此外，组装的PPy-rGO // PPy-rGO对称超级电容器具有31.95 Wh L ^-1的最大能量密度，出色的循环稳定性（10000次循环后的电容保持率为89.7％）和出色的机械性能（8000次循环后的电容保持率为82％）在不同的弯曲条件下）。