Figure
5. (a) V ptop and I ptop as
a function of R ranging from 105 to
109 Ω and (b) the corresponding P andPS ‒1. (c) A short-circuit I signal of
HILP-TENG for electric charge measurement. (d) Simulation results
obtained using COMSOL. (e) Accumulated V signals for different
capacitors. (f) LED operation using the HILP-TENG. (g) V signals
obtained from the HILP-HOLP-TENG during walking and running.