Flexible and Ultra‐Sensitive Planar Supercapacitive Pressure Sensor Based on Porous Ionic Foam

Flexible pressure sensors have broad applications in the fields of electronic skin, human–computer interaction, and health monitoring. It remains a great challenge to develop advanced sensors with mechanical flexibility while gaining high sensitivity, fast response time, and wide detection range. Herein, the design and fabrication of a new type of flexible supercapacitive pressure sensor with a device configuration of planar electrodes incorporated with porous ionic gel is reported. Taking advantage of both the electric double layer capacitance and the micro‐structured organogel electrolyte, the developed sensor exhibits ultra‐high sensitivity (1126.96 kPa −1 ), wide detection range (300 kPa), fast response time (25 ms), and excellent stability over 6000 compression‐release cycles. With consistent and stable performance, the proposed pressure sensor can be used in many applications such as finger pressing, carotid pulse measurement, and finger bending. This work provides a facile and economical approach for fabricating flexible and ultra‐sensitive pressure sensors that are promising in wearable electronics.