Self‐Healing All‐in‐One Energy Storage for Flexible Self‐Powering Ammonia Smartsensors
Hongting Ma, Fengjuan Lv, Liuxue Shen, Kaizhou Yang, Yu Jiang, Junlin Ma, Xiaodong Geng, Tongrui Sun, Yuzhen Pan, Zhuang Xie, Mianqi Xue, Nan Zhu
Abstract
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 SnO 2 /PPy‐modified conductive PVA hydrogel film, demonstrating an excellent sensing behavior toward NH 3 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.