Figure 1

Plots of power density or open circuit voltage as a function of temperature from experiments with triboelectric generators using Al and PTFE as contact materials. (A) Plot of the triboelectric power density as a function of temperature using data points from Su et al.¹³ fitted to Eq. (6). The curve is fitted to data using the least square method in gnuplot yielding a separation energy corresponding to the temperature E/k _B = 451 K. (B) Picture of the actual ion distribution and the net charge distribution. (C) Plot of normalized voltage as a function of temperature from Wen et al.¹² where Eq. (5) is fitted to data to find E/k _B = 374 K. Between 200 K and 300 K Wen et al. found a large peak that however was not reproduced by Su et al. or by Lu et al. shown above. The four highest data points in the peak are excluded from fit. (D) Plot of voltage as a function of temperature from Lu et al.¹⁴ where Eq. (5) is fitted to data. We found for this fit E/k _B = 269 K.