Flexible solid-state self-charging supercapacitor based on symmetric electrodes and piezo-electrolyte

Herein, a novel flexible solid-state self-charging supercapacitor was feasibly fabricated by employing Co-Fe 2 O 3 @ACC as symmetric electrodes and PVA-KCl-BaTiO 3 as piezo-electrolyte. The device shows high efficiency of energy collection, conversion, and self-charging under simple impacting, which provide a promising potential toward sustainable wearable electronics. • A flexible solid-state self-charging supercapacitor is fabricated. • The flexible piezo-electrolyte enables device sound mechanical energy conversion efficiency. • The device demonstrates excellent self-charging performance. • The self-charged device can light a blue LED lamp in a serially connected pattern. Fabrication of flexible power source that can provide sustainable energy is regarded as one promising strategy to address the working issue of wearable electronics in the case of no electricity or charging base. Herein, a novel flexible solid-state self-charging supercapacitor (SCSC) was creatively proposed by employing Co-doped Fe 2 O 3 grown on activated carbon cloth (Co-Fe 2 O 3 @ACC) as advanced symmetric electrodes and BaTiO 3 piezoelectric particles mixed PVA-KCl gel film (PVA-KCl-BaTiO 3 ) as piezo-electrolyte. The as-fabricated device possesses combined advantages including high flexibility, and considerable electrochemical and self-charging capability. Particularly, it can synchronously harvest and store energy via force-electric conversion with piezoelectric effect, and hence be easily self-charged to about 120 mV by simple impacting (repeated bending for 7 min at a frequency of 1.0 Hz). The acceptable self-charging capability coupled with the unique design enables the electrochemical device promising application potential for sustainable and portable wearable electronics.