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Self‐powered arbitrary wave monitoring is a hot research topic which aims to remove of the trouble associated with managing conventional power for continuous and real‐time acquisition of wave information from the marine environment. Herein, an effective approach is presented that simultaneously generates power from arbitrary motion waves and can sense and wirelessly transmit the wave information without requiring an external supply. The hybridized ellipsoidal device inspired from an elliptical trajectory of objects over shallow water waves, consists of six planar spiral coils arranged to cover the arbitrary direction of waves for power generation. Four magnetic force‐actuated triboelectric nanogenerators (TENGs) pairs along four sides as the arbitrary direction self‐powered wave motion sensors are integrated. Furthermore, all the required circuitry for signal processing and wireless transmission are integrally powered by the generated electricity to realize a self‐sustained wireless marine environment monitoring system. The generator can deliver peak power of 106 and 44.8 mW (at 3Hz) along with major and minor axis motion directions. The self‐powered sensors have excellent motion sensitivity thus the signals obtained from these sensors are utilized to acquire useful information related to the water waves which are very crucial parameters for real‐time monitoring of the marine environment. [ABSTRACT FROM AUTHOR]

Triboelectric nanogenerators (TENGs), which operate in contactless mode and avoid physical contact, are highly attractive for self‐powered sensor systems aiming to achieve long‐term reliable operation and reduce rubbing friction. Herein, an ultra‐flexible and high‐performance contactless double‐layer TENG (CDL‐TENG) is first designed and fabricated using a metal–organic framework‐based cobalt nanoporous carbon (Co‐NPC)/Ecoflex with MXene/Ecoflex nanocomposite layer for self‐powered sensor applications. The porous structure of the Co‐NPC provides a high‐surface‐area of the nanocomposite and the charge storage layer of the MXene/Ecoflex nanocomposite accumulates more negative charge to improve the functionality of the CDL‐TENG two and three times, respectively. Compared with Ecoflex film‐based TENGs, the fabricated CDL‐TENG exhibits an eight‐fold slower decay rate owing to charge trapping characteristics, which were confirmed by surface potential measurements. The CDL‐TENG shows excellent humidity and acceleration sensitivity of about 0.3 V/% and 2.06 Vs2 m−1. The CDL‐TENG also offers non‐contact position detection performance in the 20 cm range. Furthermore, the CDL‐TENG is successfully integrated with mobile‐vehicles and an intelligent robot to perform obstacle and human‐motion detection. Finally, a contactless door‐lock password authentication system was demonstrated. These multifunctional benefits make it useful for numerous applications, including artificial intelligence, human‐machine interfaces, and self‐powered sensors. [ABSTRACT FROM AUTHOR]