Dielectric Engineering of ZnO@ZIF‐8 for High‐Performance Triboelectric Nanogenerators and Self‐Powered Humidity Sensors

Porous metal oxide–metal‐organic framework (MO x @MOF) hybrids offer synergistic effects that enhance surface charge density, electronic structure, and textural properties, making them ideal for self‐powered sensing applications. Here, uniform, and pinhole‐free ternary porous ZnO–PTFE@ZIF‐8 hybrid films are developed on room‐temperature co‐sputtered ZnO–polytetrafluoroethylene (PTFE) composite films, where ZnO serves as a self‐sacrificial precursor to precisely regulate ZIF‐8 (Zn‐MeIm 2 ) growth through solvothermal methods. The resulting TENG achieves a high output power density of 0.67 mW cm −2 , attributed to the synergistic effects of fluorine‐rich PTFE and methyl‐functionalized ZIF‐8, which enhance surface charge density and dielectric response. By tuning PTFE content in the ZnO–PTFE composite, the dielectric constant and triboelectric output is optimized. The ZP60@ZIF‐8‐based device also demonstrates excellent humidity sensing performance, with a wide detection range (20–99% RH) and ultrahigh sensitivity (R V % of 19 900%, R I % of 19 325% at 99% RH). These results position ZP@ZIF‐8‐based TENGs as promising platforms for next‐generation self‐powered sensors and smart wearable electronics.