A supercapacitor with large capacitance and pressure resistance based on multifunctional organogel

A novel multifunctional organogel polyelectrolyte was prepared via esterification (polyvinyl alcohol (PVA)/trimesic acid (TA)) and Lewis acid–base reaction (PVA–TA/phenylenediamine) in dimethyl sulfoxide solvent. Organogel electrolytes possess several desirable properties, including excellent mechanical properties (2.1 kg weight), high toughness, high-temperature resistance (60 °C), large ionic conductivity (45.45 mS cm⁻¹), sizeable specific capacitance (322.5 F g⁻¹) and high mass energy density (28.67 W h kg⁻¹). Furthermore, the high scanning rate of 50 mV s⁻¹ maintains the high-speed performance of the SC in the ideal CV state. As a practical application, a digital watch is lit up by two capacitors in series, demonstrating excellent practicability of the equipment in the field of energy storage. In addition, on account of their remarkable conductivity and flexibility, the PVA/TA/PPD organogels can be made into a touch pen (T-pen) for smartphones or tablets, which opens up possibilities and potential for the development of some operational electronics.