Fig. 4: The influence of ∆T on TDNG with different friction materials.
From: High performance temperature difference triboelectric nanogenerator
a The output voltage (blue line), current (black line) of TDNG with different external circuit load resistance when ∆T is equal to 0 K and 145 K, respectively. b The output power of TDNG with different external circuit load resistance when ∆T is equal to 0 K (black line) and 145 K (red line), respectively. c The open-circuit voltage and d short-circuit current with different friction materials when ∆T = 0 K (black column) and optimal ∆T (red column). e The open-circuit voltage and f short-circuit current density of Al-PTFE TDNG at ∆T = 90 K.
