Fig. 6: Portable and wearable self-powered systems assisted with machine learning technology.

a Self-powered machine learning glove based on a superhydrophobic triboelectric fabric structure. Reprinted from ref. ¹⁰¹ with permission. b Self-powered triboelectricity-based touchpad (TTP). Reprinted from ref. ¹⁰² with permission. c Epidermal sEMG tattoo-like patch for silent speech recognition. Reprinted from ref. ¹⁰³ with permission. d TENG-based smart electronics for both voice signal recognition and handwritten signal recognition. Reprinted from ref. ¹⁰⁴ with permission.