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Ion‐Transfer Voltammetry at the Interface between Organic and Salt‐Doped Ice Phases
Author(s) -
Qu Hui,
Harada Makoto,
Okada Tetsuo
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500181
Subject(s) - tetramethylammonium , chemistry , aqueous solution , ion , analytical chemistry (journal) , phase (matter) , cyclic voltammetry , voltammetry , volume (thermodynamics) , inorganic chemistry , electrochemistry , chromatography , thermodynamics , organic chemistry , electrode , physics
Ions play critical roles in reactions of biological, environmental, and industrial importance under frozen conditions. Transfer voltammetry of tetramethylammonium (TMA) and K + ions is measured at the interface between frozen aqueous NaCl and dichloroethane to give an insight into chemistry in frozen aqueous phases. The ion‐transfer current of TMA initially increases as the temperature becomes lower from the freezing point, but the further decrease in temperature reduces the transfer current. The half‐wave potential of the TMA transfer shows a negative shift when the liquid phase volume is smaller than 10 % of the total volume of the frozen phase. Similarly, the half‐wave potential of the facilitated transfer of K + by crown ether complexation also becomes negative with decreasing temperature, due to the freeze concentration of K + in the liquid phase.