A highly stretchable hybrid nanogenerator has been developed using a micro-patterned piezoelectric polymer P(VDF-TrFE), PDMS-CNT composite, and graphene nanosheets. Mechanical and thermal energies are simultaneously harvested from a single cell of the device. The hybrid nanogenerator exhibits high robustness behavior even after 30% stretching and generates very stable piezoelectric and pyroelectric power outputs due to micro-pattern designing.
A facile and scalable synthesis of mesoporous films impregnated with Au nanoparticles (NPs) as effective dielectrics is demonstrated for enhancing the nanogenerator performance based on vertical contactseparation mode. This technique is so simple and scalable, providing a promising solution for developing 10 large-scale and practical self-powered devices. The spatial distribution of the Au NPs made it possible to fabricate the Au NPs-embedded mesoporous triboelectric nanogenerator (AMTENG) with high output power of 13 mW under cycled compressive force, giving over 5-fold power enhancement, compared with the flat film-based TENG under the same mechanical force. It is proposed that the presence of aligned dipoles produced due to the charges created by the contact between Au NPs and PDMS inside the pores 15 can influence the surface potential energy of mesoporous films. With such an enhanced power output and unique device design, we demonstrate various applications such as self-powered shape mapping sensor, foot-step driven large-scale AMTENG, and an integrated circuit with a capacitor for powering a commercial cell phone for realizing self-powered systems from footsteps, wind power, and ocean waves. 65 powered devices. The spatial distribution of the Au NPs made it possible to fabricate the Au NPs-embedded mesoporous TENG (AMTENG) with high output power density of 13 mW (160 μW/cm 2 ) under cycled compressive force, giving over 5-fold power enhancement, compared with the flat film-based TENG 70 (FTENG) under the same mechanical force. It is proposed that the
For existing triboelectric nanogenerators (TENGs), it is important to explore unique methods to further enhance the output power under realistic environments to speed up their commercialization. We report here a practical TENG composed of three layers, in which the key layer, an electric double layer, is inserted between a top layer, made of Al/polydimethylsiloxane, and a bottom layer, made of Al. The efficient charge separation in the middle layer, based on Volta's electrophorus, results from sequential contact configuration of the TENG and direct electrical connection of the middle layer to the earth. A sustainable and enhanced output performance of 1.22 mA and 46.8 mW cm À 2 under low frequency of 3 Hz is produced, giving over 16-fold enhancement in output power and corresponding to energy conversion efficiency of 22.4%. Finally, a portable power-supplying system, which provides enough d.c. power for charging a smart watch or phone battery, is also successfully developed.
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