| Due to the rapid development of electronic products and the special requirements of certain occasions, supercapacitors, especially flexible and solid-state supercapacitor, hold great promise to be used as energy storage devices for electronics in the future, because of their excellent performance. In this study, we have fabricated two forms of flexible and all-so lid-state supercapacitors, namely sandwich configuration and inter-digital configuration, base on Au/PET substrate with the active material of polyaniline. The as-fabricated supercapacitor with sandwich configuration has a maximum areal capacitance of 51.7 mF·cm at a current density of 0.1 mA·cm-2 and a maximum energy density of 5.57 mWh·cm-3 at the power density of 0.33 W·cm-3 and a superior cycling stability with the capacitance retention of 92.3% after 1000 cycles. Moreover, the fabricated device has excellent flexibility when they are bent to 90° with the CV curve remaining almost unchanged and the capacitive performance has almost no change after being left in an air atmosphere for two months or dipping in acidic or alkali solutions for 24 h. In addition, the supercapacitor with interdigital configuration acquire a maximum energy density of 5.83 mWh-cm"3 and a maximum power density of 0.45 W·cm-3, and shows good cycling stability with 72.7% retention of the specific capacity after 1000 cycles. Furthermore, the devices can be optionally connected in series or parallel to improve capacity and voltage. The electrochemical performance of the two forms supercapacitor is comparable or superior to the currently available supercapacitor. The as-fabricated devices hold great promise to be used as energy storage devices for portable and wearable electronics in the future because of their excellent electrochemical performance, mechanical flexibility and cycling stability, and integrate with other devices better, such as sensors and solar cells, because of the small volume and all-solid-state feature. |
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