Here, we fabricated nanofiber (NF)-based
triboelectric nanogenerators (TENGs) from natural biopolymers using
the industrially scalable solution blowing. This technique eliminates
severe restrictions on solutions to be used and allows one to achieve
biocompatible devices. Here, solutions of soy protein and lignin were
blown into continuous monolithic NFs of hundreds of nanometers in
diameter. The technique we employed yields large-area NF mats within
tens of minutes and has never been employed to form TENGs. Furthermore,
in contrast to electrospun and meltblown fiber mats, solution-blown
NF mats are much fluffier/porous, which is beneficial for achieving
higher voltages by means of triboelectricity. In particular, triboelectricity
generated by our biopolymer-based TENGs revealed that they hold great
promise as sustainable and environmentally friendly self-powered devices
for biomedical applications with the highest efficiency in their class.
Moreover, these are the first nanotextured plant-derived biopolymer-made
TENGs.