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The electric double layer at high surface potentials : the influence of excess ion polarizability

Hatlo, Marius M. and van Roij, Rene and Lue, Leo (2012) The electric double layer at high surface potentials : the influence of excess ion polarizability. EPL: A Letters Journal Exploring the Frontiers of Physics, 97 (2). ISSN 0295-5075

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Abstract

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.