Abstract

Developing high mass loading of conducting polymers in hydrogels for flexible supercapacitors remains an enormous challenge. Herein, we demonstrate an effective and facile strategy for incorporating high mass-loading of polypyrrole (PPy) nanoparticles into an open porous polydopamine/polyacrylamide (PDA/PAAM) hydrogel substrate. The as-prepared PDA/PAAM/PPy hydrogels exhibit great stretchability and desirable self-healing properties. Taking advantage of the sandwiched configuration and high mass of electroactive PPy (up to 11.13 mg/cm2), the PDA/PAAM/PPy hydrogels could be directly used as all-in-one supercapacitors, which can deliver a superior specific capacitance of 860 mF/cm2 at 1.0 mA/cm2, an excellent energy density of 76.44 μWh/cm2, a maximum power density of 4 mW/cm2, and excellent capacitance retention of 85 % after 5000 cycles. What’s more, the PDA/PAAM/PPy hydrogels show significant strain-sensitive behavior. A self-powered sensing system integrating the supercapacitor and strain sensor is achieved to monitor various human motions. Therefore, the resultant hydrogels have potential applications in wearable electronics.

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