Recent Progress in Triboelectric Nanogenerators as a Renewable and Sustainable Power Source

Figure 5

(a) Schematic illustration of a free-standing triboelectric-layer mode TENG [47]. (b) Working principle of a free-standing triboelectric-layer mode TENG. Sketches of (c) a conductor-to-dielectric TENG and (d) a dielectric-to-dielectric TENG.

(a)

(b)

(c)

(d)