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The charge density as a function of t/d2 for the Aquivion film with 40 wt% uptake of [C2mim][TfO] under (a) 0.1 V, (b) 1 V, (c) 2 V, (d) 3 V, and (e) 4 V at the membrane thickness of d = 1.9 µm, 11 µm, and 20 µm. The error bar is indicated by the size of the symbols in the figure.
