In this study, the refined double layer model of platinum electrodes accounts for chemisorbed oxygen species, oriented interfacial water molecules and ion size effects in solution. It results in a non-monotonic surface charging relation and a peculiar capacitance vs. potential curve with a maximum and maybe negative-defined values in the potential regime of oxide-formation.
Jun Huang, Tao Zhou, Jianbo Zhang, and Michael Eikerling,Double layer of platinum electrodes: Non-monotonic surface charging phenomena and negative double layer capacitance, Journal of Chemical Physics. 148, 044704 (2018). https://doi.org/10.1063/1.5010999
Journal of Chemical Physics
Double layer of Platinum Electrodes: Non-Monotonic Surface Charging Phenomena and Negative Double Layer Capacitance
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