Functional metal/covalent organic framework materials for triboelectric nanogenerator

Triboelectric nanogenerator (TENG) with easily manufactured and high energy conversion efficiency, as a new significant advantages generation technology, has attracted extensive attention. However, the main organic polymers with low current output performance in the series of triboelectric materials are difficult to be functionalized and modified to meet more complex applications, which seriously hinders the development of TENG. Porous crystalline materials (Metalorganic frameworks (MOFs) and Covalent organic frameworks (COFs)) have also been deeply studied to improve the performance of TENG because of their unique adjustable structure properties. In particular, the MOFs and their carbon derivatives as active electrode materials have shown great commercial potential for TENG in self-powered flexible devices and sensors due to their excellent electron capture capacities and multifunctional structures. In this review, the output enhancement mechanism, triboelectric properties and applications of TENG based on porous crystalline materials were introduced in detail. This article explained the mechanism and polarization effect for COFs or MOFs enhancing the output performance of TENG. This work summarized the structural design and performance improvement of TENG based on porous crystalline materials, and described detailly the challenges and prospects in the developing high-performance and multifunctional TENG, so as to clarify the future research direction.