(a) Schematic showing the fabrication of nylon-6/PAN nanofibre/net membranes by electrospinning/netting technology. (b) Schematic showing an electret filter consists of PE/PP nanofibre as the matrix and magnesium stearate as the charge enhancer. (c) Schematic image of the filtration mechanism of the filter with R-TENG. (d) Structure and photo of a self-powered electrostatic adsorption face mask with R-TENG. Reprinted with permission from Ref. [126
], copyright 2015, Macmillan Publishers Limited; Ref. [139
], copyright 2015, The Royal Society of Chemistry; and Ref. [140
], copyright 2017–2019, American Chemical Society.