Open AccessDouble-layer structure of the Pt(111)–aqueous electrolyte interface
Author(s) -
Kasinath Ojha,
Katharina Doblhoff-Dier,
Marc T. M. Koper
Publication year - 2022
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.2116016119
Subject(s) - electrolyte , point of zero charge , ion , double layer (biology) , capacitance , polarizability , chemistry , adsorption , chemical physics , double layer capacitance , aqueous solution , surface charge , analytical chemistry (journal) , electrochemistry , inorganic chemistry , layer (electronics) , molecule , chromatography , electrode , organic chemistry , dielectric spectroscopy
Significance The Pt(111)–electrolyte interface is one of the most important model interfaces in physical electrochemistry. Here, we present detailed capacitance measurements of Pt(111) in contact with nonspecifically adsorbed electrolytes in combination with modeling to show that this interface does not follow classic Gouy–Chapman–Stern behavior. Our combined experimental-theoretical work suggests a picture of the double layer of Pt(111) with an increased ion concentration close to the interface as a consequence of a weak attractive ion–surface interaction and a changing polarizability of the Pt(111)–water interface due to the potential-dependent water adsorption and orientation.