Fig. 3: The ion selectivity and permeability of PESM.
From: Polyoxometalate-based plasmonic electron sponge membrane for nanofluidic osmotic energy conversion
A Schematical illustration of PESM for electrochemical measurement. The blue part of the membrane represents AAO and the yellow part of the membrane represents Au@POMs layer. B Illustration of the mechanism for ICR. C I−V curves of AAO, Au/AAO and PESM in 1 M KCl solution (pH = 7) The orange arrow represents the transport direction of K+. The green arrow represents the transport direction of Cl-. D ICR ratio and zeta potential of PESM under different pH values. E ICR ratio versus concentration of monovalent electrolyte solution (KCl solution) and divalent electrolyte solutions (K2SO4 and BaCl2 solution). F I-V curves of PESM in 1 M KCl solutions with and without light irradiation. G Light-switching property of PESM in 1 M KCl solution. H Ion conductance of Au/AAO and PESM with light on and off. The equations of analytical fits are as follows. Au: y = −8.12365x + 0.96674 (R2 = 0.99). Au@POMs-OFF: y = −7.84625x + 0.96121 (R2 = 0.99). Au@POMs-ON: y = −7.57091x + 0.98039 (R2 = 0.99). Error bars represent standard deviation of three different measurements. Source data are provided as a Source Data file.
