THE ELECTRICAL DOUBLE-LAYER AT THE INTERFACE BETWEEN MERCURY AND A POLYETHER ELECTROLYTE .2. THE EFFECT OF VARYING THE RELATIVE MOLAR-MASS OF THE SOLVENT
Pg. Bruce et al., THE ELECTRICAL DOUBLE-LAYER AT THE INTERFACE BETWEEN MERCURY AND A POLYETHER ELECTROLYTE .2. THE EFFECT OF VARYING THE RELATIVE MOLAR-MASS OF THE SOLVENT, Journal of electroanalytical chemistry [1992], 384(1-2), 1995, pp. 85-91
Differential capacitance measurements made at a hanging mercury drop e
lectrode using highly purified solvents are compared for a series of L
iAsF6 solutions in CH3O(CH2CH2O)(n)CH3 for n=1, 2, 4, 8 and 10. Measur
ed values of the capacitance were essentially independent of the relat
ive molar mass of the solvent except for n=1 where the values in the c
athodic region were lower and close to those reported for tetrahydrofu
ran. The inner-layer capacitance was determined as a function of charg
e density for n=10 and, using Parsons' four-state model, was shown to
behave similarly to ''group 1/group 2'' solvents. By subtracting the c
ontribution of the metal to the inner-layer capacitance, it is shown t
hat there is no significant preferential orientation of the dipoles at
the potential of zero charge at the mercury surface for LiAsF6 soluti
ons for n=10.