Gravure printing of hybrid MoS2@S-rGO interdigitated electrodes for flexible microsupercapacitors

In this letter, we demonstrated gravure printing of hybrid MoS2@S-rGO consisting of sulfonated reduced graphene oxide (S-rGO) and MoS2 nanoflowers to obtain a highly porous pattern of interdigitated electrodes, leading to a microsupercapacitor on a flexible polyimide substrate. The in-plane interdigital design of the printed microelectrodes is effective in increasing accessibility of electrolyte ions into the large active surface area. The optimized MoS2@S-rGO microsupercapacitor achieved a high specific capacitance (6.56 mF/cm2), energy density (0.58 mWh/cm3), and power density (13.4 mW/cm3), respectively. In addition, the printed microsupercapacitor lost only 9% of the maximum capacity after 1000 cycles, indicating that the printed hybrid MoS2@S-rGO microsupercapacitors are quite stable for potential flexible device applications.