Abstract
Micro-supercapacitors (MSCs) hold great promise as highly competitive miniaturized power sources satisfying the increased demand in microelectronics; however, simultaneously achieving high areal and volumetric capacitances is still a great challenge. Here we demonstrated the designed construction of binder-free, electrically conductive, nanoporous activated graphene (AG) compact films for high-performance MSCs. The binder-free AG films are fabricated by alternating deposition of electrochemically exfoliated graphene (EG) and nanoporous AG with a high specific surface area of 2920 m2/g, and then dry transferring onto the target substrates with a high-pressure mechanical densification process. Remarkably, the resulting compressed AG films showed uniform morphology in lateral dimensions, high conductivity (60S/cm), nanoporous feature (<10 0="" 5="" 8="" 10="" 89="" nm="" and="" high="" packing="" density="" g="" cm3="" the="" all-solid-state="" mscs="" ag-mscs="" based="" on="" these="" ag="" films="" simultaneously="" delivered="" an="" unprecedented="" areal="" capacitance="" of="" f="" cm2="" volumetric="" 147f="" for="" at="" 10mv="" s="" moreover="" fabricated="" could="" be="" operated="" a="" large="" scan="" rate="" 000="" mv="" showed="" outstanding="" cycling="" stability="" retention="">99.6% after 10,000 cycles). Our results suggested that AG-MSCs are competitive for prospective applications of miniaturized energy storage devices.