The electric double layer at high surface potentials: The influence of excess ion polarizability
Institute for Theoretical Physics, Utrecht University - Leuvenlaan 4, 3584 CE Utrecht, The Netherlands, EU
2 Department of Chemical and Process Engineering, University of Strathclyde - James Weir Building, 75 Montrose Street, Glasgow G1 1XJ, UK, EU
Accepted: 8 December 2011
By including the excess ion polarizability into the Poisson-Boltzmann theory, we show that the decrease in differential capacitance with voltage, observed for metal electrodes above a threshold potential, can be understood in terms of thickening of the double layer due to ion-induced polarizability holes in water. We identify a new length which controls the role of excess ion polarizability in the double layer, and show that when this is comparable to the size of the effective Debye layer, ion polarizability can significantly influence the properties of the double layer.
PACS: 82.45.Gj – Electrolytes / 73.30.+y – Surface double layers, Schottky barriers, and work functions / 82.47.Uv – Electrochemical capacitors; supercapacitors
© EPLA, 2012