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Planar on-chip micro-supercapacitors (POMSs) with interdigital configuration were produced by photolithography and self-assembly of liquid-air interface. It is notable that the electrochemical performance of the POMS was significantly enhanced by reducing the electrode width from 300 μm to 180 μm, which highlight the importance of adjusting the width of electrode when creating high-performance POMS. It produced an area capacitance of 0.26 μF cm−2. In addition, POMS provide a power density of 0.825W cm−3, much higher than the power density of the electrolytic capacitor, and capacitor retention rate after 2000 cycles stabilized at 82.5%. [ABSTRACT FROM AUTHOR]

Planar on-chip micro-supercapacitors with winding interdigitated microelectrodes were fabricated by liquid-air interfacial assembly and lithography. The micro-supercapacitors with the microelectrodes (finger width of 210 μm and gap of 70 μm) can quickly complete charging and discharging in a very short time (84 ms), owing to the shortening of the ion path. They deliver an area capacitance of 90.39 μF cm−2 and a stack capacitance of 29.16 F cm−3. In addition, the energy density and the power density at 1 V s−1 are 4.05 mWh cm−3 and 145.79 mW cm−3, respectively. The micro-devices have excellent cycling stability with 98.5% capacitance retention after 2000 cyclic voltammetry cycles and can operate well at an ultrahigh scan rate of 5000 V s−1. [ABSTRACT FROM AUTHOR]

All-solid-state planar on-chip supercapacitors (APCSs) was prepared based on reduced graphene oxide films obtained by liquid-air interfacial assembly method and hydroiodic acid treatment. The reduced graphene oxide films (495.44 S cm−1) have good surface morphologies, uniform thickness and a higher carbon to oxygen atomic ratio (C/O = 11.5) after hydroiodic acid treatment. The APCSs based on reduced graphene oxide delivered an area capacitance 69.57 μF cm−2 and a stack capacitance 2.34 F cm−3. Moveover, they show an energy density of 324.23 μWh cm−3 and a power density of 1167.21 μW cm−3. The demonstrated APCSs provide an important reference for the study of planar supercapacitors. [ABSTRACT FROM AUTHOR]