Zinc-ion supercapacitor with stress sensing function based on CZIF-67-CNTs cathode

In view of the growing market for new energy vehicles and flexible wearable electronic devices, the demand for high performance, low cost and high safety energy storage devices is increasing. Here, a zinc-ion supercapacitor (ZISC) with CZIF-67-CNTs cathode and zinc foil anode was constructed. This energy storage system provides superb electrochemical properties with specific capacitance of 103.3 F g −1 (0.2 A g −1 ), energy density of 32.3 Wh kg −1 (150 W kg −1 ) and capacitance retention of 74 % (20,000 cycles). A facile sensor application is also provided for ZISC with hydrogel as the electrolyte, and the device exhibits a stress-sensitive current response. Then an elastic electrochemical operating mechanism is also proposed. This compressible quasi-solid-state ZISC shows enormous application value in wearable stress sensing and energy storage devices.