Highly stable metal-organic framework UiO-66-NH <sub>2</sub> for high-performance triboelectric nanogenerators
Yongmei Wang, Xinxin Zhang, Dingyi Yang, Liting Wu, Jiaojiao Zhang, Tianmin Lei, Rusen Yang
Abstract
Abstract The high porosity, controllable size, high surface area, and chemical versatility of a metal-organic framework (MOF) enable it a good material for a triboelectric nanogenerator (TENG), and some MOFs have been incorporated in the fabrication of TENGs. However, the understanding of effects of MOFs on the energy conversion of a TENG is still lacking, which inhibits the improvement of the performance of MOF-based TENGs. Here, UiO-66-NH 2 MOFs were found to significantly increase the power of a TENG and the mechanism was carefully examined. The electron-withdrawing (EW) ability of Zr-based UiO-66-family MOFs was enhanced by designing the amino functionalized 1,4-terephthalic acid (1,4-BDC) as ligand. The chemically modified UiO-66-NH 2 was found to increase the surface roughness and surface potential of a composite film with MOFs embedded in polydimethylsiloxane (PDMS) matrix. Thus the total charges due to the contact electrification increased significantly. The composite-based TENG was found to be very durable and its output voltage and current were 4 times and 60 times higher than that of a PDMS-based TENG. This work revealed an effective strategy to design MOFs with excellent EW abilities for high-performance TENGs.