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A High‐Voltage Electrochemical Cell Operating with Two Aqueous Electrolytes of Different pH Values
Author(s) -
Ratajczak Paula,
Béguin François
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201800778
Subject(s) - electrolyte , potassium hydroxide , separator (oil production) , electrochemistry , aqueous solution , chemistry , inorganic chemistry , sodium hydroxide , electrochemical cell , electrode , potassium , membrane , thermodynamics , biochemistry , physics , organic chemistry
A concept of a carbon/carbon electrochemical cell using aqueous electrolytic solutions of potassium hydroxide and sodium sulfate as catholyte and anolyte, respectively, and a cation exchange membrane as separator is presented. Owing to the pH difference between the two electrolytes, the theoretical potential difference between water oxidation and reduction is enlarged. Experimentally, an optimized cell could be charged up to 1.5 V, while the operating potential range of the electrodes fitted in the thermodynamic stability limits of the electrolytes. The cell demonstrated a good life span, with constant capacitance and resistance values, when it was kept at imposed voltage of 1.5 V for a total number of 120 hours.