All‐In‐One Sensing Supercapacitor With Shared Configuration and Decoupled Performance

ABSTRACT Integrated energy‐storage sensing devices promote greatly the miniaturization and integration of wearable electronic devices. However, they still face long‐lasting challenges of tailored semi‐integrated configuration or highly‐coupled sensing and energy storage functions. Herein, an unprecedented all‐in‐one sensing supercapacitor (ASS) is proposed for independent and synchronous strain sensing and self‐powering. The ASS features a shared configuration, endows it with several key features, including reversible changes of ion‐transport paths and resistance in porous electrolyte, robust electron transport in the dense electrode, and stable interface resistance in the chain‐entangled interfaces. These guarantee reliable sensing and charge‐discharge processes under compression. Consequently, the ASS exhibits satisfactory electrochemical performance, including low interface‐resistance, high areal‐capacitance (37.9 mF cm −2 ), and good stability (98.8% capacitance retention after 5000 cycles), which can be well maintained under wide compressive strains of 0%∼80% and 5000 cyclic compression‐release. Furthermore, good sensing characteristics are also achieved with wide detection ranges up to 80% compressive strain and superior durability (>7000 cycles). The ASS also shows minimal mutual interference in synchronous sensing‐powering mode over harsh conditions, highlighting its great multi‐scenario applications. These findings open up a new perspective for highly efficient all‐in‐one energy‐storage sensing devices toward practical wearable applications.