Measurement of Electric Double Layer Charging Dynamics on Platinum Electrodes in Aqueous Solutions of Alkali Sulfates and Nitrates

The charging dynamics of electric double layers (EDLs) have been extensively investigated through theoretical and simulation methods, yet the experimental studies remain limited. In this work, we accurately measure the charge dynamics between platinum plate electrodes and the aqueous solutions of seven electrolytes, including sulfuric acid, lithium sulfate, sodium sulfate, potassium sulfate, lithium nitrate, sodium nitrate, and potassium nitrate. This study explores the dependence of EDL charging dynamics on voltage, electrolyte concentration, and electrode distance with an equivalent circuit model employed in data analysis.