Molecular scale roughness effects on electric double layer structure in asymmetric ionic liquids

Khlyupin, A.; Nesterova, I.; Gerke, K.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 10 апреля 2024 г.

Авторы: Khlyupin Aleksey, Nesterova Irina, Gerke Kirill
Журнал: Electrochimica Acta
Том: 450
Год издания: 2023
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 142261
DOI: 10.1016/j.electacta.2023.142261
Аннотация: Electrode surface roughness significantly impacts the structure of electric double layer on a molecular scale. We derive analytical solutions for differential capacitance (DC) of electric double layer near rough electrode surface, comparing them with a range of experimental and numerical studies. Two causes of ions separation are considered: ion size asymmetry and electrode surface roughness. By ions separation we mean rearrangement of ions with different sizes due to steric interactions with electrode surface. The model has three scale parameters determining DC properties: the Debye length, difference of ion penetration depths, and surface roughness parameter. For the first time, DC profile with more than two peaks was obtained analytically due to account for ions reorientation effect. The model predicts DC curve transform from bell to camel shape and inverse induced by electrode surface roughness. The behavior of DC-potential relation with temperature and ion size ratio diverges depending on the type of ions separation. Additionally, we provide analytical solutions for zero charge potential and demonstrate roughness effect on its value. Based on the results, we give recommendations for properties required to design effective electric double layer capacitors.
Добавил в систему: Герке Кирилл Миронович

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Molecular scale roughness effects on electric double layer structure in asymmetric ionic liquidsстатья

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