We investigated the effect of superhydrophobic walls on electrokinetics phenomena in a finite-length microchannel with superhydrophobic walls (in both transient and steady-state). We implemented the effect of superhydrophobicity using Naviers slip-length. To include the importance of the electric double-layer, we scaled the slip-length with respect to Debye-length (kappa(-1)). By increasing the slip-length from 0 to 144 nm (1.5 kappa(-1)), streaming-current, streaming-potential, flow-rate and electrokinetic energy conversion increased by 2.55, 2.44, 1.8, and 3.4 folds, accordingly. The electrokinetic energy conversion of each microchannel was in the order of picowatt. To produce more energy, an array of microchannels should be used. (C) 2018 Elsevier B.V. All rights reserved.