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The electric double layer is an important structure that appears at chargedliquid interfaces, and it determines the performance of various electrochemicaldevices such as supercapacitors and electrokinetic energy converters. Here thedouble-layer capacitance of the interface between aluminum electrodes andwater/1-propanol electrolyte solutions is investigated using electrochemicalimpedance spectroscopy. The double-layer capacitances of mixture solvents arealmost the same as those of water-only electrolyte solutions, and thedouble-layer capacitance of 1-propanol-only solutions are significantly smallerthan those of other volume fractions of water. The qualitative variation of thedouble-layer capacitances with the water volume fraction is independent of theelectrolyte types and their concentrations. Therefore, these results can beexplained by ubiquitous preferential water adsorption caused by thehydrophilicity of the electrode surface.

Ubiquitous preferential water adsorption to electrodes in water/1-propanol mixtures detected by electrochemical impedance spectroscopy