2020/06/07 by Hongxuan Guo, Alexander Yulaev, Guo, Hongxuan +13
Chemistry · Chemical Engineering · #Electrochemical Analysis and Applications #Electrostatics and Colloid Interactions #Analytical Chemistry and Sensors
paper · pdf · doi:10.48550/arxiv.2006.04283
Electrical double layers play a key role in a variety of electrochemical systems. The mean free path of secondary electrons in aqueous solutions is on the order of a nanometer, making them suitable for probing of ultrathin electrical double layers at solid-liquid electrolyte interfaces. Employing graphene as an electron-transparent electrode in a two-electrode electrochemical system, we show that the secondary electron yield of the graphene-liquid interface depends on the ionic strength and concentration of electrolyte and applied bias at the remote counter electrode. These observations have been related to polarization-induced changes in the potential distribution within the electrical double layer and demonstrate the feasibility of using scanning electron microscopy to examine and map electrified liquid-solid interfaces