4.7 Article

In situ analysis of pore size effect of ionic solvation during the formation of double electric layers

Journal

JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 880, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2020.114846

Keywords

EQCM; Pore size; Ion size; Solvation effect; Pore size effect

Funding

  1. National Natural Science Foundation of China [21503146]
  2. Natural Science Foundation of Tianjin Municipality [18JCYBJC21200]
  3. Yangtze Scholars and Innovative Research Team in Chinese University [IRT-17R81]

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The study used EQCM technique to investigate the influence of pore size, ion size, and solvation effect on the formation of EDLCs. The findings indicate that the pore size effect exists concurrently with solvation effect and is influenced by the size of counter-ions, polarity of solvent molecules, and ionic concentrations.
Electrochemical quartz crystal microbalance (EQCM) technique was used to characterize the influence of pore size and ion size and, solvation effect on the formation of electric double-layer capacitors (EDLCs). Based on quantitative calculation and analysis, the apparent molecular mass (Msx) was calculated from the slope of the electrode mass change (?m) vs. the charge (?Q) passed in the electrode during charging/discharge. Comparing Msx with the molar mass of bare ion, the value of specific solvation number(x)was deduced. Findings indicate that the formation of double layers at electrode interface by ionic absorption was accompanied by solvation effect. The solvation effect was weakened as the pore size of the electrode decreased, concluding that the pore size effect exist concurrently with solvation effect during ionic adsorption. The pore size effect was influenced by the size of the counter-ions, polarity of solvent molecules and ionic concentrations.

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