Self‐Healing All‐in‐One Energy Storage for Flexible Self‐Powering Ammonia Smartsensors

Self‐healable and flexible all‐in‐one self‐powering smartsensing devices have recently attracted great attention. Herein, a flexible all‐in‐one solid‐state electronic system of polyvinyl alcohol (PVA) hydrogel‐based supercapacitors for self‐powering ammonia smartsensors has been fabricated. Self‐healing supercapacitors are prepared by integrating polypyrrole (PPy) and boron cross‐linked PVA/KCl hydrogel as a sandwich configuration, exhibiting large specific capacitance of 244.81 mF cm−2 at 0.47 mA cm−2, and good charging/discharging stability of 2000 cycles, while ammonia sensors are realized by a SnO2/PPy‐modified conductive PVA hydrogel film, demonstrating an excellent sensing behavior toward NH3 vapor under 50 ppb–500 ppm. As a result, self‐healing supercapacitors could well store energy and then self‐power sensing unit for remotely real‐time detection via a smartphone, acquiring high flexibility of energy‐sensing system. With attractive biocompatibility and self‐healing performance toward various environment, this all‐in‐one flexible energy‐smartsensor system would pave the way to novel fabrication process in realization of wearable self‐healing smart devices. A flexible and self‐healing all‐in‐one solid‐state electronic system of PVA hydrogel‐based supercapacitors and NH3 sensors has been fabricated. This wearable all‐in‐one device has high flexibility, good biocompatibility, and self‐healing properties toward various environments. It has a broad prospective in practical application in realization of advanced wearable electronics and smart energy systems.