Fig. 4: Dependence of flow velocity and output voltage on air humidity.
From: Circadian humidity fluctuation induced capillary flow for sustainable mobile energy

a Snapshot of polystyrene microspheres movement of dry IL under air humidity of 90%. b Statistics of velocity under RH of 5–90%. c Averaged velocity and VOC versus RH. Inset is dependence of VOC on inward movement velocity (0–80 μm/s). d WC of dry IL drop versus time and WCS under different RH (25 °C).