Energy harvesting and power transmission is a significant challenge for the self-powered technologies towards mobile electronic devices. Here, we propose a hybridized energy harvester to complement each other's strengths for simultaneously scavenging multiple types of energy and then wirelessly transmit the power. The harvester consists of electromagnetic-triboelectric nanogenerator units for collecting rotational energy and a commercial water-proof flexible solar cell. At a rotation rate of 500 rpm, the output current of electromagnetic-triboelectric nanogenerator units can reach about 630 mA through energy management. Moreover, the power harvested by hybridized energy harvester can be wirelessly transmitted up to a distance of about 100 cm in real time to charge mobile phone, anemometer, and hygrometer based on self-resonant coils. The hybridized energy harvester with wireless power transmission has potential applications in large-scale energy collection, long-distance wireless power transmission and sustainably driving mobile electronic devices.

Along with the unceasing growth of worldwide economic and the associated issues on resources, energy and environment, clean energy generating technologies that are based on recyclable materials, if possible, may become the future trend of development. Here, we report the design of a cheap, lightweight, and recyclable single-electrode triboelectric nanogenerator (TENG) that utilizes waste paper as the triboelectric material. Under the current strategy, we successfully developed green energy machines without vastly increasing the mining of various critical minerals around the world. The as-designed TENG could not only collect and convert mechanical energy into electricity with sound efficiency, but also has the merit for continuous reuse and quick construction. The maximum output power density is as high as 171 mW·m⁻² at a resistance of 130 MΩ and could be integrated into a book for monitoring reading actions, thus providing a new approach to the low-cost, green and sustainable self-powered electronic systems.

Triboelectric nanogenerator (TENG) has been proved as a promising energy harvester in recent years, but the challenges of exploring economically triboelectric materials still exist and have aroused interests of many researchers. In this paper, chitosan-silk fibroin-airlaid paper composite film (CSA film) was fabricated and then the CSA film based-triboelectric nanogenerator (CSA-TENG) was constructed, which presents an opportunity for natural polymers to be applied in triboelectric materials. Due to the excellent electron donating ability of CSA film, the CSA-TENG can harvest environmental energy with a high efficiency. More importantly, the as-designed CSA film based dual-electrode triboelectric nanogenerator (CSA-D-TENG) is successfully assembled into hand clapper and trampoline to harvest mechanical energies generated by human bodies, it is also capable of monitoring human movement while harvesting biomechanical energies. This work provides a simple and environmental-friendly way to develop TENG for biomechanical energies harvesting and human motion monitoring.