Premium
Redox‐Polysilsesquioxane Film as a New Chloride Storage Electrode for Desalination Batteries
Author(s) -
Silambarasan Krishnamoorthy,
Joseph James
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201800601
Subject(s) - desalination , redox , inorganic chemistry , electrode , chemical engineering , electrochemistry , adsorption , battery (electricity) , materials science , chemistry , membrane , organic chemistry , biochemistry , power (physics) , physics , quantum mechanics , engineering
Desalination battery is an emerging concept used in electrochemical technology to solve the problems in sea water desalination. However, identifying an efficient and reversible chloride (Cl − ) storage electrode is a major challenge for the development of desalination batteries. A new membraneless, reversible desalination battery consisting of an efficient, reversible, high‐capacity Cl − storage electrode, ferrocyanide molecule immobilized polysilsesquioxane (redox‐PSQ), in combination with the cation storage material, a nickel hexacyanoferrate film in real sea water, is described. The redox‐PSQ polymer is superior over the other reported Cl − storage electrodes (Ag and Bi electrodes) in terms of cost, stability, reversibility, and Cl − ion removal capacity in real‐time applications. About 164 mg L −1 of Cl − ion is removed from natural sea water per 7.6 × 10 −8 mol cm −2 surface concentration of electrode material with 98% coulombic efficiency. During the desalination process, alkali ions move toward nickel hexacyanoferrate and Cl − ions moves toward the redox‐PSQ film from the sea water. During the salination process, the stored ions are recovered from the electrode surface as a result of partial energy recovery. Furthermore, this electrode also removes the sulfate ion present in the sea water by the electrostatic adsorption phenomenon. In addition, a high‐voltage (2.3 V), Mg//redox‐PSQ polymer cell is constructed with a red light‐emitting diode that glows during the salination process.