@article{120311,
  author = {D. J. Bozym and B. Uralcan and D. T. Limmer and M. A. Pope and N.J. Szamreta and P.G. Debenedetti and I.A. Aksay},
  title = {Anomalous Capacitance Maximum of the Glassy Carbon-Ionic Liquid Interface through Dilution with Organic Solvents},
  abstract = { <p>We use electrochemical impedance spectroscopy to measure the effect of diluting a hydrophobic room temperature ionic liquid with miscible organic solvents on the differential capacitance of the glassy carbon - electrolyte interface. We show that the minimum differential capacitance increases with dilution and reaches a maximum value at ionic liquid contents near 5 - 10 mol\% (i.e., \~{} 1 M). We provide evidence that mixtures with 1,2-dichloroethane, a low- dielectric constant solvent, yield the largest gains in capacitance near the open circuit potential when compared against two traditional solvents, acetonitrile and propylene carbonate. To provide a fundamental basis for these observations, we use a coarse-grained model to relate structural variations at the double layer to the occurrence of the maximum. Our results reveal the potential for the enhancement of double-layer capacitance through dilution.</p> },
  year = {2015},
  journal = {J. Phys. Chem. Lett.},
  volume = {6},
  pages = {2644-2648},
  language = {eng},
}