You can check e.g. https://www.mdpi.com/1424-8220/22/15/5555

Novel methods are necessary to efficiently capture and convert ambient energy from mechanical vibrations to electrical energy for various low-frequency vibrations. Usually, such vibrations have a smaller energy amount and a longer frequency, which causes the devices to work around these characteristics. To improve energy capture for energy harvesting from slow, irregular vibrations, engineers frequently apply methods involving resonant structures, magnetic connection, and frequency conversion. These structures are made using cantilever flexible beams, which increases their sensitivity to the input frequency. Advanced materials like piezoelectric polymers and triboelectric nanogenerators also display potential because of their remarkable adaptability and high sensitivity to low-frequency inputs. Designing circuits for energy management, which are sensitive to the varying power levels, reducing energy losses, and optimizing the efficacy of transforming energy from rotating to electricity are all crucial for creating handy and reliable systems. Such systems should also power devices with a low level of energy input.