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[Display omitted] • HEH provides new power supply solutions for marine and river monitoring equipment. • Mixed use of PEH and EMH improves prototype output performance. • The use of non-contact magnetism can improve service life. • Prototypes can easily power some commercial sensing electronics. Water contains a great amount of potential energy, out of this, an energy harvesting and converting solution from water is very promising for green renewable energy. In this paper, a hybrid energy harvester (HEH) is proposed, which has a combination of piezoelectric and electromagnetic mechanisms for energy conversion. Two piezoelectric energy harvesters (PEH) and two electromagnetic energy harvesters (EMH) can work synchronously to achieve high-performance output. The structural variables of the prototype are studied and analyzed through the self-designed experimental test system. When the prototype is assembled with optimal structural parameters, the maximum output voltages of a single PEH and EMH are 56.24 V and 1.016 V. The maximum output power of HEH is 22.78mW, which is 21 % higher than that of PEH and 253011 % higher than that of EMH. Subsequent underwater tests and a series of application tests were performed to verify the performance of the HEH, showing that it can easily power some commercially available sensors and small electronic devices. Experimental results show that HEH is promising in wireless self-powering and self-sensing. It provides a new power supply scheme for laying power supply without grid for monitoring equipment in deep sea and ocean environment. [ABSTRACT FROM AUTHOR]

• The P-ESSD can realize self-powered wireless transmission of self-aware signals. • The use of non-contact magnetism can improve service life. • The effect of magnet size on different energy conversion parts is analyzed in detail. • It operates stably as a self-powered sensor that can monitor the vehicle. Based on the energy and resources wasted in urban traffic congestion, as well as the strategic goals of energy saving, emission reduction, and sustainable development are constantly being valued. This paper proposes the P-ESSD for vehicle monitoring. The PEH and the EMH are combined as self-powered and self-sensing modules in this device. The PEH is used to supply energy to the EMH for the wireless transmission of self-sensing signals. The influence of the rectangular magnet in PEH, the coil and the cylindrical magnet in EMH on the output performance of the prototype is studied. Under the optimal parameter conditions of prototype assembly, the maximum output voltage of PEH is 60.62 V pp , and the maximum output voltage of EMH is 3.81 V pp. The ability of simultaneously self-power supply and self-sensing was verified with eight prototype arrays installed into the deceleration belt and tested on the actual road. [ABSTRACT FROM AUTHOR]