▎ 摘　　要

The push toward smart technologies and the Internet-of-Things (IoT) demands the development of miniaturized energy storage devices. Herein, a facile and scalable strategy is presented, based on laser reduction of graphene oxide into graphene followed by electrodeposition of polyaniline (PANi), to fabricate a substrate-free supercapacitor. The fabricated supercapacitor is part of a flexible multifunctional integrated system comprising a thin-film humidity sensor, a resistor, and a near field communication (NFC) antenna for IoT-linked wireless communication with a smartphone. The integrated sensory system shares laser-scribed graphene (LSG) as the same electrode material for all the components (supercapacitor, sensor, resistor, and NFC antenna). The symmetric LSG-PANi||LSG-PANi supercapacitor with wireless charging capability exhibits a near record-high energy density of 0.407 mW h cm(-3), and excellent power density of 196 mW cm(-3), along with an outstanding rate capability (enduring high rates of over 1 V s(-1)). As a humidity sensor, the device demonstrates high resistance changes from 2000 k omega at 0% relative humidity (RH) to 497 k omega at 100% RH (15 k omega per RH%) with a sub-second scale (0.87 s) response time. This research paves the way for limitless applications of IoT across a wide spectrum of fields from healthcare to chip-based electronics to environmental monitoring.