Nanocrystalline Metal–Organic Framework for Triboelectric Nanogenerators

Nanocrystalline Metal–Organic Framework for Triboelectric Nanogenerators

Author: ChemistryViews

Triboelectric nanogenerators (TENGs) can transform mechanical energy into electrical energy through the triboelectric effect. The triboelectric effect is a phenomenon in which certain materials become electrically charged after they are separated from a different material with which they were in contact. It is often the cause of the static electricity we experience in everyday life. TENGs send this electricity through a circuit to power a device. However, they usually have a low power output, which hampers their practical use.

Zhichao Shao, Zhongyuan University of Technology, Zhengzhou, China, Hongwei Hou, Zhengzhou University, China, and colleagues have developed a 3D nanocrystalline Cd-based metal–organic framework (MOF) that could be used as a high-performance triboelectric positive electrode material. The team prepared the MOF (structure detail pictured) from Cd(NO3)2·4H2O and a twisted organic ligand with four carboxyl groups in N,N-dimethylformamide (DMF) and water, using ultrasonication.

The resulting MOF nanocrystals were used to coat a conductive copper foil, forming the positive electrode material for the TENG. The negative electrode material was prepared from polyvinylidene fluoride (PVDF) powder, which was dissolved and spin-coated onto a polymer film. The resulting TENGs showed high power densities and stable outputs. According to the researchers, the nanocrystalline MOF particles provide a high surface area, which improves TENG performance. The device can, for example, quickly charge commercial capacitors or power a large number of LED lights.


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