Keggin-type polyoxometalate-containing metal–organic hybrids as friction materials for triboelectric nanogenerators

Abstract

With the rapid development of triboelectric nanogenerators (TENGs), it is urgent to develop novel friction materials to expand the conventional materials in the triboelectric series to meet the diverse requirements of far-ranging applications. In this work, two α-Keggin-type polyoxometalate (POM)-based metal–organic hybrid compounds were synthesized through the fine-tuning of the reactants under the same reaction conditions, including one discrete ionic structure and one one-dimensional infinite chain structure. They were first used as triboelectric layers, together with polyvinylidene fluoride (PVDF) as the opposite layer to fabricate TENGs. The results displayed that the TENG based on the discrete hybrid with a higher permittivity displayed a superior output performance of 395 V and 34.8 μA and demonstrated good stability during cyclic measurement of over 50 000 cycles.