Fig. 5

The frequency filtering performances and filtering process. a AC line-filtering performance of the aqueous hybrid electrochemical capacitor (AHEC) unit and aluminum electrolytic capacitors (AEC) at 1 Hz. b Histogram of variance of the output signals data of AHEC and AEC vs. frequency. c The schematic illustration of rectifier and its circuit. d The schematic illustration of AHEC unit and its filtering procedure. e The conversion process of the sinusoidal AC signal to DC signal. Source data are provided as a Source Data file