Study On Printed Graphite - Based Miniature Supercapacitor

In this paper, we reduced the the transmission distance of electrolyte ions by improving graphene materials and adopting interdigital electrodes. Firstly, we prepared reduced graphene oxide(r GO) and reduced graphene oxide with sulfonation(S-r GO) as electrodes’ materials. By characterizing, it shows that, S-r GO has been many folds and its edges curl, which can form a certain porosities that are conducive to the infiltration of electrolyte and ensure its good performance. After preparing r GO and S-r GO ink, we developed the r GO and S-r GO intedigital micro-supercapacitors by gravure printing technology. By characterizing, it shows that, the specific capacitance of r GO and S-r GO micro-supercapacitors are respectively 1.52 m F/cm2 and 2.88 m F/cm2 at the current density of 25 mA/ cm2.Secondly, in order to further increase the specific capacitance of r GO micro-supercapacitor. We use biomolecule-assisted synthetic method to prepare Mo S2/r GO composites as electrodes’ materials. By characterizing, it shows that, the structure of Mo S2/r GO is 3D “nanoflowers”, which is also conducive to the infiltration of electrolyte. And the addition of Mo S2 with high capacitance ensures the composites’ excellent performance. Then we prepare Mo S2/r GO intedigital micro-supercapacitors by gravure printing technology. By characterizing, it shows that the specific capacitance of the Mo S2/r GO micro-supercapacitor is 6.56 m F/cm2 at the current density of 35 μA/cm2. And when the energy density is 0.58 m Wh/cm3, the power density is 13.4 m W/cm3. It can be shown that the addition of Mo S2 and the special structure make the composites have good performance.In this paper, we creatively prepared graphene-based intedigital micro-supercapacitors with high mass loading by gravure printing technology. And we achieved S-r GO and Mo S2/r GO intedigital micro-supercapacitors with excellentcapacitive performance by improving the structure of graphene, adding Mo S2 and adopting the electrodes with intedigital structure.