Triboelectric nanogenerators (TENGs) based on halide perovskites are considered attractive thanks to their high output performance as micro-nano energy sources. However, the presence of toxic lead and environmental instability hamper their practical applications in wearable electronics.
To address these challenges, researchers from Shandong University and Henan University have developed a lead-free bismuth halide perovskite, CsBi3I10 (CBI), integrated with polyvinylidene fluoride (PVDF) in a nanofiber composite film via a one-step electrospinning deposition process, serving as an alternative triboelectric layer for TENGs.
Their recent study highlights the critical influence of concentration, compositions, and fabrication process on the output performance of TENGs. By incorporating CBI at a 20 % loading using an electrospinning technique, the device showed a significantly enhanced output performance, achieving a maximum instantaneous power density of 7.11 W m−2, surpassing previously reported counterparts. These results were validated by the dielectric constant and Kelvin probe force microscope analysis of the triboelectric layers.
Notably, benefiting from the nanofiber composite form, the device exhibited high stability owing to its insensitivity to environmental moisture.
When attached to different parts of the human body, the device effectively translates external stimuli into electric signals. This functionality was exemplified in its use as a triggering sensor for a wearable intelligent fall alarm system, enabling real-time communication for individuals with disabilities.
This work not only broadens the application of bismuth halogen perovskite-based TENG in the field of triggered tactile sensing but also provides a feasible approach for self-powered mechanosensation, such as human motion detection and human–machine interactions, which demonstrates the promising potential application on the Internet of Things (IoT).
